Question about Ford Escort

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No heat and heat rises on engine

My heater stopped working and heat rises on engine but when i accelerate and rpm's rise my heat starts working and engine heat returns to normal. as soon as rpm's go down heat blows cold air and engine starts to over heat.

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  • Kevin Gilliland Mar 04, 2009

    Info was great,I changed the thermostat and everything is working like it should. Thank you



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Add any coolant recently? Start w the basics. I think you just need to add water. H2O...No more coolant.

Posted on Aug 08, 2012

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You have an air pocket in the cooling system.Make sure you don't have any leaks or loose clamps that could cause system to get air in system. Then park vehicle on an incline or jack front end up to get the top of radiator higher than the heater core then remove radiator cap,fill system then run for 2 minutes at 2000 rpms,you should see some bubbles at the radiator cap then refill system and reinstall cap.This should take care of your problem unless you have a leak somewhere.

Posted on Mar 02, 2009

  • Chuck Martin
    Chuck Martin Mar 02, 2009

    See normal coolant flow at idle is only about 6 gals per minute and at speed it is about 20 gals per minute.If you have an air pocket then it will stop at the highest point,the heater core and block flow until you increase the flow by revingengine.

  • Chuck Martin
    Chuck Martin Mar 04, 2009

    If you do not have air in the system then your flow is the problem and that would be the water pump itself,it is possible that the fins may be damaged but since it does heat good when you rev up the engine then I would suspect an air pocket more than an actual flow problem.


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Ok i would check the thermostat and the heater core for malfunctioning values. i would also replace the fan clutch. its malfunctioning as well.. i suspect a problem with the thermostat and heater core but, check the fan clutch just to be safe.

Posted on Mar 02, 2009

  • Michael Masters
    Michael Masters Mar 02, 2009

    Oh, one more thing, you may need a new water pump as swell. run a test on this part to.

  • Michael Masters
    Michael Masters Mar 04, 2009



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