Question about Chrysler Town & Country

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2001 crysler town & Country 3.3. when it gets really cold the engine wont warm up. heater doesn't work. replaced thermostat and water pump. still no heat

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  • Justin Holter Dec 12, 2009

    thanks for the input. I know that there is no problem in the heater core. the thermostat is correct 195 deg. I replaced it twice. the engine would not warm up past 140 deg yesterday. it was about 10 below or so. today its warmer outside and so the engine is able to warm up enough to blow some hot air out of the heat registers. I think maybe the system is getting pressure lock so the thermostat isn't able to work properly, or the coolant temp sensor is faulty and making the radiator fans run to much. the although the scan tool showed the coolant sensor at an accurate temperature. wish it was colder outside so that I could properly test it. am missing something? appreciate your feedback


    thanks,


    Justin

  • Justin Holter Dec 12, 2009

    Hi there,


    about done working on this for today,


    I have noticed the reading on the scan tool is looking like what the gauge in the dash is reading, also when I open the radiator cap and feel of the anti-freeze with my hand it isn't really hot. the radiator fans would run if the heater is set on defrost/floor cause it makes the air conditioner pump run to help defrost the WinShield . When I take the cap off it doesn't appear to be flowing I imagine it won't flow cause it's not reaching 195 degrees.thinking it's probably pressure locked because when you drive about a mile out on the road the engine temp comes up a little and the heater starts to blow some pretty decent hot air. the engine coolant is full and good for -34 deg.


    thanks


    Justin

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  • 1,168 Answers

Hello Justin.
If your thermostat has been replaced with the proper one your engine is heating up.
The problem then becomes twofold.
The amount of coolant/antifreeze flowing through the heater core or a problem with the airflow over the core inside the heater plenum assembly.
I would check for coolant flow through the core first.
If the heat feels like it is warmer coming out an outlet with the fan on a low setting rather than a high one your heater core isn't flowing enough.
To verify you can also check the two hoses that go through the firewall to your heater core once the vehicle has been warmed up, feel the temperature difference between the two. They should both be almost hot enough not to hang on to and close to equal temperature. A hand held temperature gun is really handy for doing this.
If one is hotter than the other your heater core has restricted flow and will need to be flushed or replaced.
Next is to check your temperature blend door operation.
Move the control to hot and cool and listen for the door to move and feel for the temperature to change, if it does at all. The fan on low setting is best to listen and feel temperature changes.
If you feel a temperature change or hear the door thump at each end of it's travel it is OK.
If you have more questions on this problem leave it in "add a comment" and I will return your question.

KL

Posted on Dec 12, 2009

  • FUBAR Dec 12, 2009

    thanks for the input. I know that there is no problem in the heater
    core. the thermostat is correct 195 deg. I replaced it twice. the
    engine would not warm up past 140 deg yesterday. it was about 10 below
    or so. today its warmer outside and so the engine is able to warm up
    enough to blow some hot air out of the heat registers. I think maybe
    the system is getting pressure lock so the thermostat isn't able to
    work properly, or the coolant temp sensor is faulty and making the
    radiator fans run to much. the although the scan tool showed the
    coolant sensor at an accurate temperature. wish it was colder outside
    so that I could properly test it. am missing something? appreciate your
    feedback


    thanks,


    Justin

    Hi Justin.
    Where are you getting this 140 degree reading from? If you are getting it from the temperature sensor it may not be a correct reading if the cooling system still has air in it.
    When you start it cold the upper rad hose should not get hot until the thermostat opens at 195.
    A temperature gun is really handy for checking the temperature at the thermostat for when it opens.
    The cooling fans would make little, if any, difference in the temperature the engine is running at unless the thermostat is open and circulating through the rad.
    Which leads to the next question, why are the cooling fans coming on so often.
    The cooling fans will only come on when the A/C compressor comes on or if the engine temperature is around 227 F.
    It can have an airlock in the heater hoses but you say they are flowing OK?
    Verify your cooling system is full and keep me informed.

    KL



  • FUBAR Dec 12, 2009

    Hello Justin.
    I have a feeling your thermostat is somehow flowing before it is supposed to. Try measuring the temperature at the thermostat housing somehow. It should be close to 195 when it opens.
    It should come up to temperature even at an idle if thermostat is working properly.
    Like I mentioned previously, feel your upper rad hose from a cold start. If you feel heat in it the antifreeze is getting by it cooling off your engine temperature.
    The fluid you are feeling at the rad cap is on the opposite side of inlet from the thermostat so it would feel cool.
    There is no way it's a "pressure lock". An airlock could happen but only likely in your heater hoses.


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