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Old 01-24-2013, 01:46 PM   #1
nikos07
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2005 330ci Thermostat Problem

I have a 2005 330ci Convertible and recently my thermostat has been malfunctioning. When my car is idling, the thermostat gauge climbs in between "cold" and "hot." But when I start driving, the gauge starts moving backwards to the "cold" side and it stays like that until I idle again and then it climbs back up to the middle. I don't know why this is happening. Is it the gauge that has the problem or do I need a new thermostat. Any help would be greatly appreciated...

Niko
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Old 01-24-2013, 01:49 PM   #2
tock172
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Old 01-24-2013, 02:58 PM   #3
rwall
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These thermostats fail in the "open" position, which means they won't partially close when it needs to when airflow is good at highway speeds. You can drive like this for a week or so, so go ahead and order one and plan about 1-2 hours to replace it. Familiarize yourself with how to bleed the air out of your cooling system at the end of the job, and you'll be good. The whole job is an easy DIY. I just did it to my car (same exact symptoms), and taking my time I needed 1 1/2 hours to complete. One last tip - I suggest you buy replacement plastic clips for the tray that goes under your engine and one plastic clip that holds your radiator/fan assembly in. I buggered up almost all of the clips on mine, and just to satisfy the OCD part of my brain I had to replace them all with new ones.
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Old 01-24-2013, 03:05 PM   #4
Kubica
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Bleed the system.
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Old 01-24-2013, 03:05 PM   #5
nikos07
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Quote:
Originally Posted by rwall View Post
These thermostats fail in the "open" position, which means they won't partially close when it needs to when airflow is good at highway speeds. You can drive like this for a week or so, so go ahead and order one and plan about 1-2 hours to replace it. Familiarize yourself with how to bleed the air out of your cooling system at the end of the job, and you'll be good. The whole job is an easy DIY. I just did it to my car (same exact symptoms), and taking my time I needed 1 1/2 hours to complete. One last tip - I suggest you buy replacement plastic clips for the tray that goes under your engine and one plastic clip that holds your radiator/fan assembly in. I buggered up almost all of the clips on mine, and just to satisfy the OCD part of my brain I had to replace them all with new ones.
Thanks, I was planning on changing my thermostat but I just wanted to get someone else's opinion first.
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Old 01-24-2013, 03:14 PM   #6
nikos07
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Originally Posted by Kubica View Post
Bleed the system.
i added coolant about a month ago or so, can i bleed the system as of right now or do i need to drive it a little before i do that. i did notice that this problem started shortly after i added coolant into my car...
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Old 01-24-2013, 03:17 PM   #7
E46Moonlight
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Quote:
Originally Posted by nikos07 View Post
i added coolant about a month ago or so, can i bleed the system as of right now or do i need to drive it a little before i do that. i did notice that this problem started shortly after i added coolant into my car...
bleed again could just be a bubble in the system
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Old 01-24-2013, 05:32 PM   #8
ixtoxi
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Thermostat.
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Old 01-25-2013, 08:25 AM   #9
WDE46
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Buy a new Wahler or Behr thermostat. End of discussion! $50 to fix this problem. Then properly bleed the system.

Last edited by WDE46; 01-25-2013 at 08:26 AM.
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Old 01-25-2013, 08:52 AM   #10
taibinhvuong
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OP, your problem is a malfunction thermostat, not a bleeding problem, you only need to bleed it after you replaced the t-stat, not need to just for topping up coolant if car was not overheat.
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