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Old 09-19-2013, 12:41 PM   #1
aa34s
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Engine heat comes into interior

I got a 99 328i and just found out that the engine heat comes iinto the interior when the engine in normal temp. Even I turn the temp to the lowest, it's still blowing warm air.

Can anyone give me some ideas??

Thanks
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Old 09-19-2013, 12:43 PM   #2
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Old 09-19-2013, 01:08 PM   #3
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^^^^ +1
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Old 09-19-2013, 01:39 PM   #4
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yes, I set it in cool (blue dot) but still blowing warm air.
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Old 09-19-2013, 01:48 PM   #5
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not sure what it is called on a BMW but most european cars have this part, on a Mercedes it's either called a mono-valve or duo-valve, it lets coolant into the heater box to warm up the vehicle, when the valve fails it's normally stuck open, so even when you have the heat off & the A/C on, it's still letting hot coolant into the heater box, it will normally come up as a fault if you scan your vehicle.
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Old 09-20-2013, 08:46 AM   #6
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I have the same problem (on my E36, though); it's supposed to be the heater control value on the firewall behind the engine (not too accessible and $$$). There's an E36 thread on bimmerforums http://forums.bimmerforums.com/forum...ater-valve-DIY. Complete with pics.

Last edited by kenmar; 09-20-2013 at 09:12 AM.
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Old 09-20-2013, 10:03 AM   #7
e30drifter
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Does your heater work properly? Or act funny? I had the same problem. My heater control kinda worked. For the most part it would be on. Temp set to the coolest, fan on 1. I wouldn't get much heat from the dash but the engine temp would start to run really hot. At time my heater unit would stop working and I would have to smack it for it to come on. But when in the not working position I would get extreme heat coming from my dash and my car would not overheat when idling. Or those two situations could have been vice versa heater control working or not working. I can't remember. But either way It was either me overheating or my car overheating. I also had some kind of temp/censor code. I changed my heater control unit and no more problem and the code went away. I never knew about that heater switch at the firewall. I always thought it could be something like that, that could haven causing this issue and not the heater control. I guess in my case I got lucky?
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Old 09-20-2013, 10:21 AM   #8
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Forgot to mention that my auxiliary fan would not come on when idling if my heater control unit was on or not working, I can't remember. But I do remember my car would Idle differently when I would unplug and plug it back in. It wasn't a huge difference. Only noticeable when the car was running. my replacement unit has no effect on idle.
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Old 09-20-2013, 10:26 AM   #9
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Oh shit. I just noticed this is in the e46 section. My car is an e36. Sorry for any confusion I may have caused
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Old 09-20-2013, 04:48 PM   #10
aa34s
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Thanks for all the replies.
I used the scan tool but no fault codes.
It's normal if I turn on the heat, but it blows warm air when I set to the low temp.
My A/C is not working now and I took out the belt for the A/C. Will it affect the heating system??

Thanks again.
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