Question about 1994 BMW 3 Series

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1993 BMW 325is heater

1993 BMW 325is
my heater only works when the car is moving and works best on the highway. i have brought it to my mechanic 3 times or so now and he fixes it each time but then after about 2 weeks it fail again and goes back to the same problem; blowing out cool air when the car is on but idle, and when i move it warms up. even if i am moving a great deal say 20 min on highway it gets nice and warm but once i get off the highway and come to red light or stop somewhere it goes back to cool air. i got a new radiator, and still have problem. my thermostat does move sometime; it will move towards overheating and occasionaly light red but most of the time it will quickly or steadily go back to the center before it overheats. anyone know what the problem could be or what should i do to finally fix this especially since i brought it to my mechanic 3 times. my family has been going to him for years and he usually knows his stuff

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  • keith wycko
    keith wycko Mar 02, 2009

    how much is a waterpump gonna run me?

  • keith wycko
    keith wycko Mar 02, 2009

    ya me and the mechanic made sure it was full i actually checked back with him a week later to check that and we discussed maken sure the air was bled im gonna have to bring it back again im just sick of payen to fix this **** iv prolly put more $ into the car then wat i paid for it

  • baines4t4 May 09, 2009

    my 93 325is started overheating for no reason so i replaced the radiator with a CXracing performance radiator the plastic water pump with a bavarian metal impeller water pump the radiator hoses with mishimoto performance radiator hoses the plastic thermostat husing with the bavarian metallic housing yet my car is still f$*!ing overheating can anybody help


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Try to get a power washer and take the expanchon tank cap off run the engine and flush it out with the power washer as i had the same problem and got sick of it and blew it out from the engine take the hose off from the themostate and gun it with the power washer and found when i done this it stop over heating all together mate good luck

Posted on Mar 02, 2009

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I would try a waterpump.

Posted on Mar 02, 2009

  • Clint Smock
    Clint Smock Mar 02, 2009

    I'm not sure, I've only replaced two, and it has been a while. First I would make sure the antifreeze is full but since you have had it at a mechanic 3 times, i would assume that it is full. But check anyways. Also make sure all the air is bled out.

  • Clint Smock
    Clint Smock Mar 02, 2009

    You will likely have to pay about 300 for the waterpump, installed.


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SOURCE: heating problem

I've had that problem with a customers car before, but I changed the water pump, and it seemed to fix it. A lot of times the water pump, can't pump fast enough when it's at idle. Try it.

Posted on Mar 06, 2009

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