Intake heater light on freightliner

Wait to Start light does not come on in the dashboard. Truck will start but is difficult especially in colder temps now. ... My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the ...

Intake heater light on freightliner. A couple of things are happening, fuel is being pumped the engine is doing some computer checks and if the weather is cool, there is a powerful heater, heating up the intake so that the engine starts easily. The colder the day, the longer it takes for the "wait to start" engine light to go out because the heater is taking more time.

Freightliner AC systems are much larger than most vehicle systems, and they use a larger condenser and an air compressor to cool the air. An evaporator is used on freightliner truc...

Page 156 20.05 Fan Clutch, Horton DriveMaster Troubleshooting Troubleshooting Tables Problem—Air Is Leaking from the Fan Clutch Problem—Air Is Leaking from the Fan …usmilret. Find the intake air heater and then find the leads to that heater. Disconnect the leads and check for resistance at those leads. You can check Youtube on how to do it. If your intake air heater is not heating up and if there is no voltage drop because of the electrical load that is not placed on the intake air heater then you can ...Light Mode; menu Log in ... "Air intake heaters, also known as grid heaters and manifold heaters, are used in diesel applications needing quick, smooth and reliable starts in cold weather. ... '97 Freightliner MT-35 Step Van 15' long cargo area custom RV project 4BTA, ZF5 trans swapped, 4K GSK, HD Valve Springs, P-pump, ...2513208C92 INTAKE GRID HEATER KIT is an OEM part from Navistar International®, Kits: (1.00) SINGLE GRID HEATER ASSEMBLY; (1.00) GASKET INLET DUCT- INTAKE MANIFOLD; (1.00) INSTRUCTION SHEET; , Engine Platform: I367 - 2013 Emissions MaxxForce DT, 9, 10, OEM Description: INTAKE GRID HEATER KIT, Package …Feb 5, 2016 · I have a 2006 Bluebird Vision with a C7 Cat giving me fits. The "wait to start" light is on constantly KOEO or engine running and the grid heater is never activated at cold start up. If I supply power and ground to the solenoid it activates and the heater works as it should, with the signal wires disconnected I have ground on one and 7.2 Volts ... %PDF-1.4 %âãÏÓ 4520 0 obj > endobj xref 4520 25 0000000016 00000 n 0000003330 00000 n 0000003476 00000 n 0000003514 00000 n 0000003737 00000 n 0000003880 00000 n 0000004524 00000 n 0000005195 00000 n 0000005234 00000 n 0000005313 00000 n 0000005390 00000 n 0000005563 00000 n 0000006101 00000 n 0000006758 00000 n 0000007660 00000 n 0000008440 00000 n 0000009180 00000 n 0000009889 00000 n ...The heater will stay on for a few minutes, It is there to help starting and reduce smoke during warmup.i haven't worked on cats in a few years but i think the heater can stay on for up to 5 minutes in extremely cold environments. and yes they will draw voltage down .On our Freightliner m2 trucks with cummins engines,the intake heater will cycle ...Find somewhere else to keep these household objects. In addition to using less energy, part of the appeal of tankless hot water heaters is that they take up less space than traditi...

Jul 30, 2011 · 76 posts · Joined 2011. #1 · Jul 30, 2011. I was driving today and the wait to start/glow plug light started flashing along with chimes. Now it's on permanently. Anyone know why that is. All other gauges read ok. No check engine light and truck starts and shuts down as normal. Any help would be appreciated. The air intake heater control helps the combustion process while starting in cold temperatures by controlling the heating elements in the engine's intake air system. The ECM controls the heating elements in two phases, pre-heat and post-heat. The amount of time that the intake air heater remains on depends on the intake manifold temperature at ...ok, attached is a pin diagram for the air heater. check all fuses with a test light for power on both sides key on. Roy. As I said, I'm not near the vehicle, so will have to try this out later. Thanks. Ask Your Own Medium and Heavy Trucks Question. Hello, the engine number is ***** Ref No is C01-00003-394.TWR. 1940 posts · Joined 2011. #3 · Jan 19, 2016. check the intake manifold air temperature sensor this sensor tells the ECM when to turn the grid heater on by what temp the intake is as i recall anything under 66 degrees it does not turn the heater on anything below 66 at start it turns it on the grid heater.S2 Chassis Maintenance Manual, November 201942/9. 5. Check the fuse for the hydraulic brake booster pump, as follows. 5.1 Open the cover to the main power distri- bution module (PDM). 5.2 Pull the fuse in position F6 for the Hydro- Max relay. 5.3 Inspect the relay to make sure the fuse is not damaged.2001 Freightliner FL70, the glow plug light and the ABS light stay on all the time. Is it ok to drive? 2001 Freightliner - Answered by a verified Technician. ... The vehicle looks to be in great shape! I think the light is probably just a failed glow plug, or Intake heater. With this size of truck it might just be an intake heater but either ...

2181 Posts. Posted - 03/24/2009 : 07:32:30 AM. I have a 99 GMCV with the CAT 3126. I get a check engine and intake heater lamp at the same time under a load. The engine feels like it's derating but I have limited data access with my scan tool. Fuel rate stays normal but boost will drop to 16psi at 99% throttle.nskyline34 Discussion starter. 1706 posts · Joined 2013. #5 · Dec 5, 2023. Well ordered a complete GDP setup - intake manifold, intake horn, and their high flow grid heater. More than I wanted to spend, but the only company that makes them specifically for the C&C trucks and plus I like the idea of the added flow of the intake horn.Fl70 with a cat 3126. the intake heater light does not come on. and won't start without ether. 2002. Replaced the intake - Answered by a verified Technician. We use cookies to give you the best possible experience on our website. ... Hi, I have a 3126 CAT engine in a 1997 Freightliner FL-70.My dash doesn’t light up with an inlet heater light when I turn the key. I’m guessing - Answered by a verified Technician ... 30 degree Fahrenheit day. Intake heater on caterpillar C7 not giving power, on the opposite side of the solenoid when the key is turned forward. ... There's a LOW AIR! warning light on the dash. Freightliner M2 106 ...

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My dash doesn’t light up with an inlet heater light when I turn the key. I’m guessing - Answered by a verified Technician ... 30 degree Fahrenheit day. Intake heater on caterpillar C7 not giving power, on the opposite side of the solenoid when the key is turned forward. ... There's a LOW AIR! warning light on the dash. Freightliner M2 106 ...EZWiring EZWiring™ makes Freightliner, Sterling, Western Star, Thomas Built Buses, and Freightliner Custom Chassis Corporation products’ wiring drawings and floating pin lists available online for viewing and printing. EZWiring can also be ac-cessed from within PartsPro. Introduction Descriptions of Service Publications2007 freightliner trash truck last 6 w25979. Mercedes mbe 900. Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts. Active codes for engine are pid45 fmi 3 occurring 36 times.1. Turn on ignition. 2. Wait till you hear the systems boot up (on mine, six clicks) and wait for "wait light" to go out. 3. Turn off ignition and repeat the sequence. (this allows the preheater to perform twice ensuring good …

%PDF-1.4 %âãÏÓ 4520 0 obj > endobj xref 4520 25 0000000016 00000 n 0000003330 00000 n 0000003476 00000 n 0000003514 00000 n 0000003737 00000 n 0000003880 00000 n 0000004524 00000 n 0000005195 00000 n 0000005234 00000 n 0000005313 00000 n 0000005390 00000 n 0000005563 00000 n 0000006101 00000 n 0000006758 00000 n 0000007660 00000 n 0000008440 00000 n 0000009180 00000 n 0000009889 00000 n ...The ABS light is a steady burn while cranking but once it fires it flashes for about 30 sec before going off. ... It **might** have an intake heater. It would be on the air intake pipe going in to the engine and have a couple of 2 gauge or so cables gojng to it. ... Freightliner used to bury them under there on the business class trucks. I ...summary: freightliner service campaign: see document search button for owner letter. freightliner columbia front air brake hoses-air products inc. only. on certain trucks, an elbow fitting connecting the brake air line hose to the front brake cha . communication number: sb-54-240, date: 2009-06-01 category: 111000 electrical system:batteryFreightliner Custom Chassis ... 09 Air Intake . 09–01 Air Cleaner Element Inspecting and Replacing ; 13 Air Compressor . 13–00 Safety Precautions ; ... 20–04 Coolant Heater Check, Webasto ; 20–05 Coolant System Maintenance, Electric Vehicle ; 20–06 Coolant Change, Electric Vehicle ...Take the rated watts for your heater divide by operating voltage gives you your amps. So if I’ve done the math correctly my engine block heater a 1000w unit using a 120 volt line draws 8.33 amps. 1000 / 120 = 8.33. Location: West Palm Beach, FL. USA.Freightliner Business Class M2 Fuse Box Diagram. Jonathan Yarden Mar 25, ... The trailer fuse box and tail light fuse box on so equipped vehicles are mounted on a bracket with the chassis module on the left frame beam aft of the cab or on a cross member at the end of the frame beam. They may be called chassis fuse box or chassis module PDM.To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. To contact Transport Canada, call the Defect In- ... 6 Heater, Ventilator and Air Conditioner .....6.1 7 …There can be numerous reasons/causes for this code failure. 1. Test the individual and total injector return rates now. May be damaged injector nut, tube hole, rust in threads. 2. Test the output i.e. measure the output of the lift pump and the CP3, if either are low in volume or pressure, will cause the code. 3.Freightliner Business Class M2 Fuse Box Diagram. In this article you will find a description of fuses and relays Freightliner, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for). Get tips on blown fuses, replacing a fuse, and more.

To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Cen-ter at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada that are thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Trans-port Canada and Daimler Truck North ...

CASCADIA MAINTENANCE MANUAL Models: CA113DC CA113SLP CA125DC CA125SLP STI-478-6 (02/03/2022) Published by Daimler Truck North America LLC 4747 N. Channel Ave. Portland, OR 97217 Apr 6, 2023 · Here is what this code means: “Exhaust Emission Controller aftertreatent 1 intake gas sensor heater control mechanism system not responding or out of alignment.” That is a mouthful to say and to write. What this means is that the “NOx Raw Sensor not ready after Dewpoint enable inspection”. In other words, the sensor failed to activate. Gasoline engines use an intake manifold to deliver a fuel and air mixture to each cylinder for combustion. Intake manifolds once were made of cast iron. The biggest problem with ca...Mar 19, 2013 · Intake Manifold Heater Light Stays On!! 5669 Views 5 Replies 4 Participants Last post by ColinP, Jan 8, 2016. P. pjcovey40 Discussion Starter ... Posts: 944. Check Engine Light - Grid Heater. I have a CAT C-7 (350 HP) in a Travel Supreme motorhome with a check engine light illuminated due to the following codes: 70-5: Inlet Air Heater Driver #1. 729-5: Air Intake Heater Open Circuit. I checked the grid heater solenoid and it is good, but it appears I am not getting control power to the ...Nov 6, 2011. #4. Yes, when you turn the key to the run position the gauges will sweep from the lowest values to the highest and the solenoids in the air valves will do a "chuff" test. Then the gauges will go to the positons for the conditions present when the engine is off. I'm not sure of the 5.9 Cummins engine has an intake manifold grid ...Ok so I'm working on a MT45 Freightliner with a 6.7 cummins. Are there two intake air heaters or just one? I only see the one that sits in between the upper intake horn and the lower intake? The truck is throwing a Check engine code 70 (inlet air heater driver #1 fault> mode 13-out of calibration).18 Manual Transmissions and Clutch. 19 Drive Axles. 20 Fifth Wheels. 21 Trailer Couplings. 22 Headlights. 23 Vehicle Appearance and Care. 24 Pre- and Post-Trip Checklists. 25 Pre- and Post-Trip Inspections and Maintenance. 26 In An Emergency.

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I operate a 2010 Freightliner M2- 112 with an MBE4000 mercedes engine. It has about 20k on it. It has an "intake heater" flashing light on the dash that the dealer can't seem to find the cause of. The closest dealer is over an hour away, so it takes a lot of time to take it there. When...Intake Grid Heater light. Have a 2002 7.3 F-350. Just started having the intake heater light stay on while driving it all the time also noticed a small amount of white smoke on start up. I've read that it shouldnt be on because I'm driving, above 32* F, BLAH BLAH. Wondered if I deleted it would that fix the light or is it a relay problem.nskyline34 Discussion starter. 1706 posts · Joined 2013. #5 · Dec 5, 2023. Well ordered a complete GDP setup - intake manifold, intake horn, and their high flow grid heater. More than I wanted to spend, but the only company that makes them specifically for the C&C trucks and plus I like the idea of the added flow of the intake horn.Apr 11, 2011 · First, the heater should come on every time the key is turned to the on position. Then the Engine ECM checks the coolant and intake air temp and if they are high enough, the heater shuts off. Second, the 12volt power that operates the circuit comes from the truck, not the ECM. The most common reason for the heater not to work is a loss of power ... StealthDiesel said: The WTS start light flashing is really a big flashing warning light. Chrysler programmed that flashing light to warn the driver to shut the engine down before a failing injector trashed the engine. There are fuel system DTC codes buried somewhere in your ECM (usually P122x).The air intake restriction gauge indicates the vacuum on the engine side of the air cleaner. On standard installations, it is mounted on the air intake duct in the engine compartment. See Fig. 4.15. As an option for easier viewing, the intake-air restriction indicator can be mounted on the dash, usually on the right-hand control panel.76 posts · Joined 2011. #1 · Jul 30, 2011. I was driving today and the wait to start/glow plug light started flashing along with chimes. Now it's on permanently. Anyone know why that is. All other gauges read ok. No check engine light and truck starts and shuts down as normal. Any help would be appreciated.Jun 21, 2019 · The intake heater only engages on a cool engine to provide warm air to the combustion chambers so the engine will have good heat for combustion of the fuel. It makes the air more dense to allow the combustion during the compression stroke. The intake heater doesn't need to come on any other time. ….

Apr 6, 2023 · Here is what this code means: “Exhaust Emission Controller aftertreatent 1 intake gas sensor heater control mechanism system not responding or out of alignment.” That is a mouthful to say and to write. What this means is that the “NOx Raw Sensor not ready after Dewpoint enable inspection”. In other words, the sensor failed to activate. New Design Old Design Apr 6, 2023 · Here is what this code means: “Exhaust Emission Controller aftertreatent 1 intake gas sensor heater control mechanism system not responding or out of alignment.” That is a mouthful to say and to write. What this means is that the “NOx Raw Sensor not ready after Dewpoint enable inspection”. In other words, the sensor failed to activate. New Design Old Design#1 · Apr 19, 2017. I have an 05 2500 with a stage 2 bd turbo, 90 over injectors and a smarty touch tuner. My grid heater light keeps coming on while I'm driving along with ten dings. …Freightliner Custom Chassis ... 09 Air Intake . 09–01 Air Cleaner Element Inspecting and Replacing ; 13 Air Compressor . 13–00 Safety Precautions ; ... 20–04 Coolant Heater Check, Webasto ; 20–05 Coolant System Maintenance, Electric Vehicle ; 20–06 Coolant Change, Electric Vehicle ...Even I know not to do this...water from washing and rain was entering the air box from the head light and saturated the filter, which in turn contaminated the air intake heater. The filter was also saturated with water and the filter oil they used. Cost Break Down: OEM Air Box =$271.48 Mass Air FNC with Sensor=$344.25.To contact Freightliner about a concern about a specific vehicle call the Customer Assistance Center at 1-800-385-4357 or complete a Product Concern Form. Vehicles domiciled in Canada thought to have a defect that could cause a crash, injury, or death, should immediately be reported to Transport Canada and Daimler Truck North America …May 18, 2015 · There can be numerous reasons/causes for this code failure. 1. Test the individual and total injector return rates now. May be damaged injector nut, tube hole, rust in threads. 2. Test the output i.e. measure the output of the lift pump and the CP3, if either are low in volume or pressure, will cause the code. 3. Intake heater light on freightliner, New Design Old Design , Great thanks , Mike , does the check engine light go away without code clearing ? or does the code need to be cleared for the check engine light to go out ? ... Intake heater solenoid. Isl9 solenoid. Waited on Spartan to send and then just went to Freightliner and purchased. Attached Thumbnails 10-25-2021, 08:33 AM Mikenat. …, 2181 Posts. Posted - 03/24/2009 : 07:32:30 AM. I have a 99 GMCV with the CAT 3126. I get a check engine and intake heater lamp at the same time under a load. The engine feels like it's derating but I have limited data access with my scan tool. Fuel rate stays normal but boost will drop to 16psi at 99% throttle., Posts: 944. Check Engine Light - Grid Heater. I have a CAT C-7 (350 HP) in a Travel Supreme motorhome with a check engine light illuminated due to the following codes: 70-5: Inlet Air Heater Driver #1. 729-5: Air Intake Heater Open Circuit. I checked the grid heater solenoid and it is good, but it appears I am not getting control power to the ..., With the results, contact Mercedes-Benz Transmissions Service Support by fax (503.961.8435), email (MBTServiceSupport@ Freightliner.com), or phone (503.745.4965 or 503.745.4988). Table 2, The Battery Voltage Is Too Low 307/4 Business Class M2 Workshop Manual, Supplement 20, September 2011... , Tail Light Configurations (Module 294) Trailer Interfaces (Module 296, 297) (Module ) Engine Interface (Black Plug) (Plugs may also be frame located) 148, 163, 87L Transmission (Grey Plug) (Plugs may also frame located Interfaces. be (Module , 34C) Electrical Component Overview 2010 M2 Electrical Body Builder Reference Page # 2 Rev: New , With the results, contact Mercedes-Benz Transmissions Service Support by fax (503.961.8435), email (MBTServiceSupport@ Freightliner.com), or phone (503.745.4965 or 503.745.4988). Table 2, The Battery Voltage Is Too Low 307/4 Business Class M2 Workshop Manual, Supplement 20, September 2011..., Replacing an old water heater can help ensure that you always have enough hot water in your home, and it might also save you money on your income taxes. The Internal Revenue Servic..., %PDF-1.4 %âãÏÓ 4520 0 obj > endobj xref 4520 25 0000000016 00000 n 0000003330 00000 n 0000003476 00000 n 0000003514 00000 n 0000003737 00000 n 0000003880 00000 n 0000004524 00000 n 0000005195 00000 n 0000005234 00000 n 0000005313 00000 n 0000005390 00000 n 0000005563 00000 n 0000006101 00000 n 0000006758 00000 n 0000007660 00000 n 0000008440 00000 n 0000009180 00000 n 0000009889 00000 n ..., Page 32 Tail Light Schematics Page 33 Transmission Interface Page 34 Engine Interface Page 35 . Bulk Head Module (BHM) (Module 32A) Power Distribution (Module 285 PDM) ... C3-A Optional Fuel Water Separator Heater C4-C Left Park Lamp C4-L Right Park Lamp C4-D Left Marker Lamp C4-M Right Marker Lamp C3-N Turn Left Front/Side C1-G Turn …, Aug 6, 2015 · My question is about the air intake heater system on my 2000 Freightliner FL70 that has a Cat 3126 engine. I have had the truck since March of this year. Initially the indicator light for warming the engine when cold stayed on for about 30 seconds as it. was supposed to and the engine started fine. I have a lengthy bit of info I want to include ... , SPN 3223 Aftertreatment 1 Intake Gas Sensor Heater Control FMI 7 . SPN 3223 FMI 5 . What is SPN 3223 FMI 7? This code is telling you the NOx Inlet Sensor …, 77 posts · Joined 2013. #1 · Sep 19, 2014. Deleted my grid heater a couple months ago with a GDP delete plate, now that it is a little colder in the mornings I am getting a check engine light due to it. I searched and couldn't find a thread that solves this without putting a throttle valve grid heater in. Does anyone know how to solve this ..., 2) The intake air heater circuits will only activate when the intake manifold temperature is below 19°C [66°F] when the key switch is in the ON position. Ask Your Own Medium and Heavy Trucks Question. Voltmeter on dash Drops down every time the relay cycle When cold I turn the key on I hear the relays energize and the wait to start light ..., I operate a 2010 Freightliner M2- 112 with an MBE4000 mercedes engine. It has about 20k on it. It has an "intake heater" flashing light on the dash that the dealer can't seem to find the cause of. The closest dealer is over an hour away, so it takes a lot of time to take it there. When..., List Of Freightliner Truck Dash Warning Lights and Symbols. Figure 6.1: ICU3S Warning and Indicator Lamps for EPA10 and More Recent Engines. Symbols in Figure 6.1 and their meanings: 1. Wheel Spin Indicator. 2. Range Inhibit Warning. 3. Water In Fuel Indicator., This heater is a GREAT drain on the 12 volt system. (240 amps). The heater comes on when the ignition is turned on and runs providing heat to the intake of the turbo when cold starting. Hence the "Wait to start" light on the dashboard. If you activate the start before this light goes out, you will overload the circuit and possibly the fuse will go., We have had numerous inake heater relays fail on 3116/3126 engines. The C7 engines use a heavier relay. The earlier relays are to small to carry the 90+ amp load. On the 3116/3126 engines we have been using the Blue Bird relay that is used for the body heater/light functions. It does require replacing the terminal ends with something much …, Here are some of the best outdoor heaters for restaurants to keep your customers warm and cozy when they want to dine outdoors to enjoy a meal. If you buy something through our lin..., The voltage at this time may also read lower than normal until the heater goes out. If your intake heater light is on and the voltage is not low, it is a fair indicator of a heater circuit failure. Cal Mc Advanced Member. 303 Posts. Posted - 04/07/2014 : …, Jun 14, 2012 · I have 98.5 and my wait to start light will not come on when you turn the key to the on position right away. It takes about 8-10 seconds for the light to come on. Once the light comes on the truck will start. If i try to just turn the key and start it as soon as enter it into the ingnition the truck will just turn over and continue to turn over.... , Ok so I'm working on a MT45 Freightliner with a 6.7 cummins. Are there two intake air heaters or just one? I only see the one that sits in between the upper intake horn and the lower intake? The truck is throwing a Check engine code 70 (inlet air heater driver #1 fault> mode 13-out of calibration)., Do you know how to test a thermocouple on a gas valve? Find out how to test a thermocouple on a gas valve in this article from HowStuffWorks. Advertisement Inside your gas-operated..., Freightliner Custom Chassis ... 09 Air Intake . 09–01 Air Cleaner Element Inspecting and Replacing ; 13 Air Compressor . 13–00 Safety Precautions ; ... 20–04 Coolant Heater Check, Webasto ; 20–05 Coolant System Maintenance, Electric Vehicle ; 20–06 Coolant Change, Electric Vehicle ..., Saf-T-Liner C2 School Bus Maintenance Manual. Foreword. Introduction. 00 General Information. 01 Engine. 08 Electric Drive. 09 Air Intake. 13 Air Compressor. 15 Alternators and Starters., Great thanks , Mike , does the check engine light go away without code clearing ? or does the code need to be cleared for the check engine light to go out ? ... Intake heater solenoid. Isl9 solenoid. Waited on Spartan to send and then just went to Freightliner and purchased. Attached Thumbnails 10-25-2021, 08:33 AM Mikenat. …, On rare occasions, the Cummins Grid Heater fails and drops metal into the intake manifold causing a catastrophic engine failure. This video explains the is..., Nov 6, 2011. #4. Yes, when you turn the key to the run position the gauges will sweep from the lowest values to the highest and the solenoids in the air valves will do a "chuff" test. Then the gauges will go to the positons for the conditions present when the engine is off. I'm not sure of the 5.9 Cummins engine has an intake manifold grid ..., This time of year, you’ve gotta do some work to keep your home warm and cozy. Christmas lights, decorations, an extra throw blanket on the couch. And, of course, a space heater. Bu..., Jan 22, 2024 · I have a 2004 FREIGHTLINER M2-16 with a DT 466 Diesel engine. While driving it it runs fine but at decceleration at almost full stop, it starts shaking and acting up and the intake heater light comes … read more , superman279. 2113 posts · Joined 2010. #17 · Jul 27, 2013. No start when cold (depending on what 'cold' is to you) is more likely injector related. As far as the grid heater light goes, check for codes with the key trick. …, 5 Driver Controls. 6 Seats and Restraints. 7 Climate Control. 8 Cab Features. 9 Engine Starting, Operation, and Shutdown. 10 Optional Engine Systems. 11 Emissions and Fuel Efficiency. 12 Brake Systems. 13 Manual Transmissions and Clutch., Jun 21, 2019 · The intake heater only engages on a cool engine to provide warm air to the combustion chambers so the engine will have good heat for combustion of the fuel. It makes the air more dense to allow the combustion during the compression stroke. The intake heater doesn't need to come on any other time.