Question about 1999 BMW 328 Series

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BMW 328I No Heat ..Cold air only

I have a 99 328I. I start the car in the morning and the car warms up and the temp guage is at centre. I will get cold air for a while untill I drive for a few KM ( or Miles) and then I will start to get some warn air through. Once I stop the car at a red light or stop sign the warn air changes to cold again until i start to drive.

What is causing this, I checked the coolant and it is good, thermostate is working, what could be causing this any help is appriciated.

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  • aghadban Jan 16, 2009

    Yes it has and it does now just takes a while for the heat to come even though the Tep gauge is at center. I have had it for 4 years now and this is the first year it has done this. Dial is on the Red Hot. AC is off.

  • joe May 11, 2010

    when you increase the fan speed, can you hear the fan not only increase in sound, but also feel more air coming out of all the ducts? was just wondering if you have the ducts closed (in the '0' position instead of the 'I' position).

  • joe May 11, 2010

    has it ever put out heat? how new is this car to you?

    does this car have a dial next to the two center vents that can move from hot (red dot) to cold (blue dot)? if it does, move this dial towards the red dot and see if you feel heat after it warms up.

    also, does it have climate control? you should be able to increase and decrease the temp (and see the number visually change) by pressing the up or down button.

    there may also be a button with a snowflake on it. its for the air conditioner. it can be kept on in the winter as it will blow dry air, but you will need to make sure the temp selected is in the upper 70s for heat. i usually dont run the a/c in the winter unless i have to defrost the windshield.

    good luck.


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Put some coolant water in it. We had the same problem, cold air when the car stopped, and warm when higer speed. Needs coolant water, at least that fixed our problem :)

Posted on Jul 03, 2009

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I had this exact same problem on a 99 328i also. It would heat up when I drove fast, but when i was going slow or at a light I would only get cold air. Cooling worked fine. Finally took it to a mechanic. They replaced the water pump and the thermostat and the problem went away. Although personally, I saw the old water pump and it looked great. I think it was probably the new thermostat that did the trick. But i had both replaced and the problem definitely went away.

Posted on Feb 10, 2009

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Water pump may be the way to test take off cap when cald hold reves see if water flys out if so ok if not water pump maybe on the way out

Posted on Feb 08, 2009

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I have the same problem start with my 2004 Honda Civic Si today. I checked the coolant and it looks fine. I can see it being the thermostat, but a water pump runs of a belt, doesn't it? That either seizes and stops or it works, I would think, so I'm wondering how the water pumo coild be the problem?

Posted on Nov 24, 2010

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