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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 10-02-2015, 04:06 PM   #1
Cash1333
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Join Date: May 2014
Location: St.Louis
Posts: 31
My Ride: 2004 330ci
Exclamation Overheating issues?

So I took my 2004 330ci into a shop to get my coolant expansion tank and hoses replaced and new temperature gauge etc.. I am not sure if the bleed the system or not but now what happens is if I leave my car on running and not moving for 10-15 minutes or so my temp gauge climbs from the middle to how slowly. I am not sure why this is. I was thinking they didn't bleed the system when they put coolant into the car. But then when I start driving the temp gauge goes back to the middle. I don't think my car is overheating but I am not positive on that. Any suggestions on what's going on with my car?

Last edited by Cash1333; 10-03-2015 at 12:51 AM.
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Old 10-03-2015, 09:04 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 5,923
My Ride: 2001 330Ci
Does the car have an automatic tranny?? If it does the mechanical fan clutch is suspect. The test is to allow the engine to get to proper operating temperature and to try to stop the fan with a rolled up newspaper. If you can stop it the clutch is kaput.

If the car has a manual tyranny the electrical fan that sits between the engine and the radiator needs to be checked. Pop the hood and have someone start the car. The electric fan should spin briefly regardless of the engines temperature. If the fan doesn't spin it's kaput.

If all is ok then you need to rebleed the cooling system. See Mango's sticky n the cooling system.

Lastly, has the cooling system ever been overhauled? The cooling system on these cars is an excellent design, but most of the parts are made of plastic. Instead of replacing parts piecemeal the entire system needs to be replaced with OEM PARTS ONLY!!! DO NOT INSTALL CHEAP PARTS FROM THE LOCAL PARTS STORE! Sorry for the shout but too many owners cheap out by installing aftermarket parts and end up toasting (over-heating) the engine.

And use only BMW blue coolant and DISTILLED WATER.
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Old 10-03-2015, 12:33 PM   #3
Cash1333
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Join Date: May 2014
Location: St.Louis
Posts: 31
My Ride: 2004 330ci
The car is a manual, I just checked the Fan and noticed it wasn't plugged back in and turn A/C on full and waited about 10 minutes and it still didn't spin. I checked the fuse and it's still good, so I am ordering a new electric fan. Thanks for the help!
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