Question about 2002 Dodge Ram Maxi

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HEAT ON MY RAM

I installed a new blend door a new heater core and still have no heat. it iwll blow hot and then start blowing cold air after about 3-5 seconds. I was told the acuator may need to be callibrated to my computer is this true. I spent 1258.00 including a new a/c evaporator and still have the same problem. temp gauge is showing 1/2 when vehicle gets warm so i know the t stat is opening . I need help It is November and I am in Michigan

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  • Anonymous Nov 21, 2008

    blows cold air

  • fxstb2002 Nov 25, 2008

    I have the exact same problem.

  • Anonymous Dec 02, 2008

    Did you get it resolved?

  • rich cummings Jan 04, 2014

    how did you access the blend door. i'm having same problem with my durango but do't know how to find blend door. i also paid over 1200 dollars for new heater core insallation but still very little heat

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I replaced the blend door I guess it needs to be calibrated

Posted on Nov 16, 2008

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Did you check the blend door motor? they will break and cause the door to not move. the dealer can run it thru a mode/blend door test. They just try to move the door with the obd computer they can calibrate them as well.

Posted on Nov 16, 2008

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How do I fix the heat


You have one of two problems. The heater core is plugged /
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If both heater hoses are hot, then coolant is coming and going into/out of the heater core. The only thing that would affect heat would be a blend door not operating correctly. You will have to check the proper door that controls hot/cold air.

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1. Check coolant level to ensure full, and thus getting to heater core.
2. If that didnt work, With engine hot and running, and heat on in the truck, feel heater core inlet and outlet hoses at the engine compartment firewall to ensure both are hot an thus getting flow. If not the core is clogged or there is a faulty valve in the flow path.
3. If te hoses are hot there is flow thru the core and either your blend door is broken and shut or the blend door motor or circuitry is bad.
4. You tube Ford Ranger blend door for video on how to access behind the glove box. You can fairly easily remove the motor and undoing so check its operation and also the blend door operation.
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I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

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In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

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1 Answer

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First you have to identify what causes the problem.
To do this you have to:
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2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
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