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General E46 Forum
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Old 11-11-2008, 09:31 PM   #1
simmons797
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Join Date: May 2008
Location: St. Louis
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My Ride: 2001 325i
Automatic transmission thermostat

I was in the process of changing the expansion tank on my '01 325 when I broke the transmission thermostat. It's going to be a couple of days before I can get a replacement so I'm wondering if it will ok to drive without. My thinking is that without the thermostat coolant will be continuously circulating which will cause the ATF to take longer to reach operating temperature. Is this bad for any reason? Is there anything else that I'm not thinking of?
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Old 11-11-2008, 11:54 PM   #2
Lbert
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Remove the thermostat, you do not want the possiblity of any broken pieces floating around. Partially cover the transmission radiator with alumimum foil and strap it in place with tie wraps so it does not dispate heat as well as normal. Replace the thermostat as soon as the part arrives.
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Old 11-11-2008, 11:55 PM   #3
GRIDLOCK
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Quote:
Originally Posted by simmons797 View Post
I was in the process of changing the expansion tank on my '01 325 when I broke the transmission thermostat. It's going to be a couple of days before I can get a replacement so I'm wondering if it will ok to drive without. My thinking is that without the thermostat coolant will be continuously circulating which will cause the ATF to take longer to reach operating temperature. Is this bad for any reason? Is there anything else that I'm not thinking of?
If you're not going to be hell on wheels right out of the gate, you should be fine. Just take it easy til you get the new thermostat in there.
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Old 11-12-2008, 11:11 AM   #4
simmons797
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Thanks for the replys.

Lbert I'm not sure I'm following what you are suggesting. I don't think there is a separate transmission radiator like some cars have. Do you mean the heat exchanger? If so I don't think covering it with foil would do anything.

Anybody else have an opinoin?
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