Question about 1994 BMW 3 Series

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No heat 1994 325is has no heat but fan is working. Anyone with trouble shooting ideas would be helpful

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  • keith wycko
    keith wycko Mar 02, 2009

    i got heating problem to but my heat actually works when the car is moving and works best on highway but once i stop again it turns to cool air. its a 1993 bmw 325is. i alrdy got a new radiotor and i think theres a new thermostat but not 100% sure

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  • BMW Master
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Hey jacob, there are a number of things that can be wrong, let's start w/ easy cheap ones...1st, the easiest one is low coolant. If the level is low, it won't circulate thru the heater core, so no heat. 2nd thermostat stuck open. If this happens, the engine won't reach peak operating temp, and again, no heat. Pretty easy to check, is your car running cold (or low normal range?) If the temp gauge shows it's warming up in 5 - 10 minutes of driving, and is in normal range, then it probably isn't the thermostat. 3rd dash control that you use to select heat setting is either vacuum controlled (no vacuum @ switch possibly) or thermostatically controlled (faulty control), both of these could result in no flow of coolant to heater core, 4th a plugged up heater core (rust and corrosion) preventing coolant from flowing thru heater core. Let me know how u make out.

Posted on Nov 30, 2008

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