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Thread: No heat

  1. #1

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    Default No heat

    Recently changed thermostat housing due to a leak and the thermostat, when I let the car run it eventually heats up but as soon as I turn on my heat the gauge starts going down?? Any ideas what it could be? Could an air pocket cause this ? Or is my thermostat junk? Or would a bad heater core make the temp drop when I kick heat on??


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    I had a bad thermostat and it caused no heat.
    99 Escort sedan - Aquamarine frost metallic, 5-speed.
    99 Escort wagon - Zetec swap - Atlantic blue, automatic.
    01 Mustang Cobra - silver, 5-speed. mods.

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    Default

    Is the air coming out of the vents actually warm? and then gets cooler when the temp gauge goes down?

    My beater would do this but the temp of the air coming out of the vents wouldnt drop, it would stay warm. It was a bad sensor for the cluster.

  4. #4

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    Even driving makes the temp gauge go down, and the heat coming out of vents never gets hot


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    If thats the case, id be looking at the thermostat and or making sure all of the air is bled out.

  6. #6

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    How do I bled air out?


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    Never had to on my other zx2 when I changed the housing on it


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    Default

    When the engine is cold take off the radiator cap, start the engine, put heat on max and let it warm up.

    It helps to have a funnel in the radiator or even better one of those spill free funnels if you have one.

    What you'll be doing is watching the coolant level in the radiator and you should notice bubbles coming up, that's air escaping the coolant system, keep the radiator topped off. You should notice a big bubble come up when the thermostat opens if there was air trapped in the engine.

    Just keep an eye on the temp and keep looking for bubbles. Since your gauge might be suspect do you have a scanner to check coolant temp with?

    Feeling the hoses you should be able to tell if/when the thermostat opens. And sometimes a little squeeze will help get air out of the hoses too, be careful not to squeeze coolant out of the radiator. This is where those spill free funnels help the most, you can really squeeze the hoses and see bubbles easier.

    After its fully warmed up and if/when your thermostat cycles open and closed a few times you should have got most of the air out. Just make sure to monitor the temp so it doesn't overheat.

    If removing all of the air doesn't fix this, I'd say your thermostat is stuck open.

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    The gauge will go up and down, once it's in the middle if I turn the heat on the gauge starts to drop to colder, or while driving it'll drop the temp, I'll try to bleed it out thank you


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    it really sounds like your thermostat is stuck open

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