Question about 1994 BMW 3 Series

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Heating problem 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 03, 2009

    im bringing it to the mechanic tomorow morning, the mechanic mentioned last time that if fixing the thermostat housing because it was cracked wasnt the solution then it could well be the heater core which i was hoping it wasnt bc that would b to expensive esp if im prolly going to be selling the car within 1 yr due to i will be going to the navy

  • mark brown
    mark brown May 11, 2010

    Hi, has your mechanic checked the water pump as the impeller on the back of the pump can become insecure and not spin when idling, the syptoms of this would be the engine getting hot at low speed and no warm air but improves when at speed , hope this is of some help, regards mark.

  • joe May 11, 2010

    is it possible to ask the mechanic exactly what he is fixing each time you bring it in?

    can you take notice if the fan at the radiator is always on?

    is it possible you may need a new heater core? either hot coolant is not reaching it (ie, heater hose pinched or makes too sharp of a bend) or the heater core is clogged? can you find where the 2 hoses go into the firewall and feel each when the car is warmed up AND the heater is on and fan blowing? if both are cold, then hot coolant is not reaching it. if only one is hot (the one going to the heater core), then the heater core is clogged.

    report back with what you find.



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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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