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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Jan-08-2012, 03:49:02 PM   #1
zottyzot
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Default No heat at idle...

As the title states, when my car is idling the heat goes cold, as soon as I rev the engine it warms up. Coolant is full, i haven't done anything to the cooling system since last winter(no problems last year.) Could I have gotten an air bubble in the system some how? Is that most likely the culprit?
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Old Mon, Jan-09-2012, 01:05:51 AM   #2
Dmharvey
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Default Re: No heat at idle...

I'm having the same issue, but the top vents seem to blow cold air all the time. Haven't done any research on this yet, planning to do some searching tonight and suscribed to this thread for info.
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Old Mon, Jan-09-2012, 01:16:52 AM   #3
Dmharvey
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Default Re: No heat at idle...

After 5-10 minutes of research this is where I plan to start - http://www.pelicanparts.com/bmw/tech...e-Cleaning.htm

If that doesn't do the trick I plan to make sure the hot/cold wheel under the center vent is working properly. Might as well check the cheap/simple stuff firts...

Last edited by Dmharvey; Mon, Jan-09-2012 at 01:23:34 AM.
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Old Mon, Jan-09-2012, 02:24:06 AM   #4
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My money would be on the heater solenoid valves ad harvey suggested. More than likely the inner rubber diaphragm is wasted and youll end up having to replace it.
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Old Mon, Jan-09-2012, 06:50:53 PM   #5
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Default Re: No heat at idle...

i have been dealing with the same issue for 5 years now. Never have found anyone who is able to give a definitive answer. Some state its the control valve that you suggested earlier, some stated to install the upgraded water pump and then others stated that the heater core may be partially blocked.

Tried to remove the control valve and got stuck because I found there was not enough room for me to get in there and remove it.

My problem is now - whenever it is colder than 50 degrees outside i can be driving for 5 minutes or 2 hours, when its colder than 50 degrees my temperature gauge is at 1/4. If I stop, it rises to 1/2, where it is supposed to be, but of course at idle there is no heat. Love the car but sometimes it just makes you want to scream.

Oh, some background, 96 e36 328i with 251K.
my summer car is a 99 m3 vert with 30K
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Old Mon, Jan-09-2012, 11:30:18 PM   #6
DLite
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Default Re: No heat at idle...

The solenoid valve assembly is definately a PITA to replace...but that's the first thing I would replace...15 years of rubber in hot/cold glycol environment is well past its service.

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Originally Posted by brice017 View Post
i have been dealing with the same issue for 5 years now. Never have found anyone who is able to give a definitive answer. Some state its the control valve that you suggested earlier, some stated to install the upgraded water pump and then others stated that the heater core may be partially blocked.

Tried to remove the control valve and got stuck because I found there was not enough room for me to get in there and remove it.

My problem is now - whenever it is colder than 50 degrees outside i can be driving for 5 minutes or 2 hours, when its colder than 50 degrees my temperature gauge is at 1/4. If I stop, it rises to 1/2, where it is supposed to be, but of course at idle there is no heat. Love the car but sometimes it just makes you want to scream.

Oh, some background, 96 e36 328i with 251K.
my summer car is a 99 m3 vert with 30K
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Old Tue, Jan-10-2012, 01:49:21 AM   #7
TomS2
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Default Re: No heat at idle...

Quote:
Originally Posted by brice017 View Post
i have been dealing with the same issue for 5 years now. Never have found anyone who is able to give a definitive answer. Some state its the control valve that you suggested earlier, some stated to install the upgraded water pump and then others stated that the heater core may be partially blocked.

Tried to remove the control valve and got stuck because I found there was not enough room for me to get in there and remove it.

My problem is now - whenever it is colder than 50 degrees outside i can be driving for 5 minutes or 2 hours, when its colder than 50 degrees my temperature gauge is at 1/4. If I stop, it rises to 1/2, where it is supposed to be, but of course at idle there is no heat. Love the car but sometimes it just makes you want to scream.

Oh, some background, 96 e36 328i with 251K.
my summer car is a 99 m3 vert with 30K
in 97 i bought a legend coupe off lease from my neighbor with 241k less miles than your 328i and at a stop the temp would go to the middle, start driving and it would drop to 1/4 or less. no heat as well. it was the thermostat. my wrench replaced the over engineered acura thermostat with a cheapo from auto barn (we kept saying we would pick up the proper one but didnt get around to it) and it was fine until the car was stolen two years later.
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Old Tue, Jan-10-2012, 02:00:04 AM   #8
Dmharvey
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Default Re: No heat at idle...

I agree, brice017's second issue sounds like a bad themostat. Sounds like he has two problems to deal with. I'm putting my money on that control valve for the cold air from vents problem. In my case, I get heat from floor/defroster and I have no issues with engine temps under any conditions (my entire cooling system has about 10k miles on it). I'll post a follow-up when I clean and rebuild, or replace, that valve.
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Old Tue, Jan-10-2012, 02:11:13 AM   #9
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Default Re: No heat at idle...

I don't care what your diagnoses is... if you're 80k miles +, your heater control valve has probably been SHOT for awhile. They are absolute crap.
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Old Tue, Jan-10-2012, 02:14:27 AM   #10
Dmharvey
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Default Re: No heat at idle...

Yep...
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Discussing No heat at idle... in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)