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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 03-11-2015, 06:29 PM   #1
TeddyE46
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Thermostat

Whats up people i just bought a 04 325ci coupe it started overheating so im guessing its the thermostat i was thinking about just removing it and leaving it with no thermostat any suggestions.???
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Old 03-11-2015, 07:49 PM   #2
CapBackfire
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And put a hose in its place, as if the thermostat was constantly open? Doing so will make your car throw a check engine light for "taking too long to warm up". I say this from experience as my thermostat was stuck open until I replaced it with a new one. It's not difficult to do, the thermostat is near the top-center of the engine. When I did mine the most difficult part was removing the fan without a fan clutch.
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Old 03-11-2015, 07:56 PM   #3
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Originally Posted by TeddyE46 View Post
Whats up people i just bought a 04 325ci coupe it started overheating so im guessing its the thermostat i was thinking about just removing it and leaving it with no thermostat any suggestions.???
You should have a working thermostat to get your engine to operating temperature ASAP to reduce engine wear and emissions.
Good luck ***55356;***57152;.
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Old 03-11-2015, 08:43 PM   #4
e46 dullem
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Just buy one its only 54$ on fcp euro.
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Old 03-11-2015, 08:52 PM   #5
TeddyE46
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Yeah ima just buy a new one thanks for the feedback fellas I appreciate it.!
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Old 03-12-2015, 11:08 AM   #6
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Originally Posted by TeddyE46 View Post
Whats up people i just bought a 04 325ci coupe it started overheating so im guessing its the thermostat i was thinking about just removing it and leaving it with no thermostat any suggestions.???
Why are you 'guessing' its the thermostat?

I would work on finding out what is causing the overheating first.
Describe what happened and posters on here can help you out.
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Old 03-12-2015, 07:34 PM   #7
TeddyE46
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Well i replaced the expansion tank and drove it around for a couple blocks came back and the needle started going up.
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Old 03-13-2015, 05:10 AM   #8
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This isn't a honda civic where you can just remove parts and hope for the best. Did you replace the thermostat or not yet? Buy a Walher brand and read the following thread below. Also what brand was the expansion tank? Did you bleed the system?

http://e46fanatics.com/forum/showthread.php?t=914109
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Old 03-13-2015, 06:22 AM   #9
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Well i replaced the expansion tank and drove it around for a couple blocks came back and the needle started going up.
Probably didn't bleed the system correctly
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Old 03-13-2015, 07:27 AM   #10
TeddyE46
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Sorry guys its my first bmw cut me some slack and no i didnt bleed the system.?
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Old 03-13-2015, 07:28 AM   #11
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Click on the link I provided, everything you need to know on your cars problem is there.
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Old 03-13-2015, 03:58 PM   #12
50sKid
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You also can't just remove the thermostat on the E46--it's integrated into the housing that holds it. I agree that you haven't bled the air out of your car yet.

When the engine is cold, remove the coolant reservoir cap and add more coolant if the little red plastic float isn't popping its head up.

Then remove the bleeder screw on the upper radiator hose and run the engine up to temp to get the coolant cycling and let it bleed the air out.

If you are still having problems after that then either your thermostat has failed closed (kind of rare) and you need to replace it or your coolant temperature sensor is bad--and that one is hard to get at so I'd replace the thermostat first.

-Jason
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Old 03-13-2015, 06:07 PM   #13
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Yeah ima do that bro thanks for the info
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Old 03-17-2015, 10:45 PM   #14
TeddyE46
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I bleed out the tank ran it for about a half hour the needle went up a bit over the half way mark and now theres a small leak i havent got to that yet tho.
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Old 03-17-2015, 11:03 PM   #15
invisible man
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The car won't overheat if the thermostat fails. Quite the opposite. Something else is wrong. And stop saying "ima"
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