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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 12-28-2010, 06:43 PM
cali311soca cali311soca is offline
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Location: Cherry Point, NC
 
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Mein Auto: 2004 M3 6sp
Does this happen with your car?

Can one of you try this and get back with me? When you crank up your car when it's cold, look inside your expansion tank, and does it pump coolant upon start up? I know the thermostat should keep the coolant from circulating until it gets up to operating temperature. I don't know the exact schematics of how the coolant travels, so it might be normal for it to pump coolant into the expansion tank and then the thermostat opens up to circulate through the rest of the block.

I just replaced my thermostat, but I'm still having problems with the heater not getting warm on occasion. It happens very inconsistenly. Now I know you're thinking heater core, but if my heater core was clogged, it wouldn't work all the time right? Or if it had a crack there would be a leak, or smell coming from vents.

For example, I'll crank up my car and after a few miles I notice that my heat isn't warming up. I'll stop, shut off my car, and then crank it back up. Voila, the heat comes on. I checked all my fuses to make sure they were secured properly. And it doesn't take it a while to warm up once I restart it, it usually gets hot pretty quickly.

Just recently did a coolant flush and coolant level is fine and no leaking anywhere under car, or on carpeting inside car.
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  #2  
Old 12-28-2010, 07:41 PM
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TexasSpartan TexasSpartan is offline
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Location: Katy, TX
 
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Mein Auto: '11 E92 M3
Quote:
Originally Posted by cali311soca View Post
Can one of you try this and get back with me? When you crank up your car when it's cold, look inside your expansion tank, and does it pump coolant upon start up? I know the thermostat should keep the coolant from circulating until it gets up to operating temperature. I don't know the exact schematics of how the coolant travels, so it might be normal for it to pump coolant into the expansion tank and then the thermostat opens up to circulate through the rest of the block.

I just replaced my thermostat, but I'm still having problems with the heater not getting warm on occasion. It happens very inconsistenly. Now I know you're thinking heater core, but if my heater core was clogged, it wouldn't work all the time right? Or if it had a crack there would be a leak, or smell coming from vents.

For example, I'll crank up my car and after a few miles I notice that my heat isn't warming up. I'll stop, shut off my car, and then crank it back up. Voila, the heat comes on. I checked all my fuses to make sure they were secured properly. And it doesn't take it a while to warm up once I restart it, it usually gets hot pretty quickly.

Just recently did a coolant flush and coolant level is fine and no leaking anywhere under car, or on carpeting inside car.
I assume it wasn't getting hot prior to replacing the thermostat or did all this start after the flush and thermo replacement?
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Old 12-28-2010, 08:21 PM
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DSXMachina DSXMachina is offline
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Mein Auto: 335i E92 TiAg 6MT ED
Is this happening to the 325 or another car?
Did you get the thermostat from BMW?

Last edited by DSXMachina; 12-28-2010 at 08:23 PM.
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Old 12-28-2010, 09:05 PM
cali311soca cali311soca is offline
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Mein Auto: 2004 M3 6sp
It was happening before I replaced the thermostat. My car overheated + I didn't get any heat. That's why I went straight for the thermostat. Yes, bought the thermostat from BMW, but the part is made by Wahler. It's the only brand on any website I found, and I got it from tischerbmw.

It is happening to my 325.
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Last edited by cali311soca; 12-28-2010 at 09:09 PM.
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Old 12-29-2010, 09:35 AM
energetik9 energetik9 is offline
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I can't even remember the last time I looked under my hood??
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Old 12-29-2010, 02:49 PM
cali311soca cali311soca is offline
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Found the problem, which was caused by another problem. Get this.

I started my car, and noticed the fan turned on right away. That told me that something wasn't working properly. I opened my expansion tank and my water pump wasn't pumping coolant thru the system. Which is why I wasn't getting any heat and my car was overheating. What sucks is, when I hooked up the diagnostics, it didn't throw a code and here's why.

You know the whole weak mounting bolts for the valve cover that break off? Well, i've had a slight oil leak in the front right hand side of my engine. I took off my engine cover and that corner bolt was broken off. Well, oil had been dripping right on the connection to the water pump. I wiggled the connection and saw oil seeping out and the pump turned on. So, all I'm going to do is take spray some alcohol into the open connection to clean the oil out and replace that bolt. All in all, I replaced a thermostat for no reason. But hey, now I know that it'll last a lot longer
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