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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 10-22-2009, 08:51 PM   #1
generic 330i
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Signs of a bad Thermostat?

Hey all I know the usual signs of a bad thermostat is either an error code or the temperature gauge would be stuck in the cold section.

When my car warms up the temperature gauge rarely hits the middle. It is usually below that or close to the quarter section of cold. Now the weird thing is that when I turn the heat on in the car, the temparature guage slowly moves up to the middle and stays there. My car has about 59k and does not spit out any Maintenance required lights.

Is this a sign of a bad thermostat?
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Old 10-23-2009, 11:00 AM   #2
hummer
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Yes. Change it before it leaves you stranded from overheating. Happened to me! Over time mine was slow to warm up and ran cool. Then red light!
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Old 10-23-2009, 08:03 PM   #3
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Quote:
Originally Posted by hummer View Post
Yes. Change it before it leaves you stranded from overheating. Happened to me! Over time mine was slow to warm up and ran cool. Then red light!
x2

Except I changed mine before I got the red light. Another sign is that it takes forever for your heater to blow warm air.
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Old 10-23-2009, 09:06 PM   #4
generic 330i
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Thanks for confirming my suspicions. I already bought a behr thermostat, now I just have to find some time this weekend
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Old 10-24-2009, 01:41 AM   #5
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yes that is a bad thermostat
my car also started to take very long to warm up
i also replaced the thermostat 2 days ago
within the time that i did not replace my thermostat it put too much stress on my water pump and made that fail also, so i ended up replacing the water pump.

fix it quick before your water pump fails cause the next worse thing is a leaky head gasket!
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Old 10-24-2009, 04:22 AM   #6
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Quote:
Originally Posted by MrRizzmeister View Post
yes that is a bad thermostat
my car also started to take very long to warm up
i also replaced the thermostat 2 days ago
within the time that i did not replace my thermostat it put too much stress on my water pump and made that fail also, so i ended up replacing the water pump.

fix it quick before your water pump fails cause the next worse thing is a leaky head gasket!
Well probably a good idea to do both along with the expansion tank at the same time. Maybe hoses too.

If you have a manual, its a breeze. Auto - slighty more of a PIA.
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