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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-26-2011, 07:33 AM
eaMonkey eaMonkey is offline
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Exclamation 2004 bmw 325xi overheating!!

Hey, I have a 2004 325XI and I was hitting the gas a little rough on the way to picking up my brother from work. The radiator was replaced a couple months before this time so i know it wasnt that. The car overheated on the way back and i kept driving it like a moron and the coolant expansion resevoir exploded when i opened the hood. I replace the thermostat and the expanision tank and i tried flushing the coolant and everything but the car still overheats after about 10 minutes of driving around. Any ideas? maybe i flushed the coolant wrong because their still isnt any heat in the car either?
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  #2  
Old 10-26-2011, 07:52 AM
ventsyv ventsyv is offline
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You have to bleed the system. Look in the wiki for a DIY on the water pump, the last few steps explain how to bleed the cooling system. After all the trapped air is out, you'll have to top off the coolant. Do that and report the results.
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Old 10-26-2011, 07:55 AM
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Fast Bob Fast Bob is offline
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Hate to say it, Sport, but you probably caused extensive (and EXPENSIVE) damage by continuing to drive the car. Head gasket failures, warped or cracked heads are not unheard of in situations like yours. Take it to a shop where they can perform a compression/leakdown test to help diagnose the problem.
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Old 10-29-2011, 12:18 PM
eaMonkey eaMonkey is offline
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Sorry guys, ive been meaning to try out your method Ventsyv, i searched it and found out exactly what to do step by step. I know for a fact that i messed up the coolant drain and fill process by a few small steps. Bob I hope its not that serious. I love this car. Ill be sure to let you guys know as soon as it stops raining here and i can finally work on it.
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Old 11-17-2011, 11:37 AM
eaMonkey eaMonkey is offline
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So i did the DIY coolant flush and fill to point and still had the same results. The car still overheats without warning after reaching normal temp. I do remember when replacing the coolant expansion tank the little sensor at the bottom has a turning lock mechanism made of plastic which broke when we pulled it out and now that sensor isnt locked into place, its just compressed by the tank sittig on top of it. I was checking if the coolant is actually even flowing from the radiator past the water pump into the engine and back and it is but at a very minimal rate at normal temp. So i think that that sensor being uncompressed could be blocking the expansion tank opening. I dont exactly know what kind of sensor that is. I think its the transmission thermostat. If you guys have any knowledge of what it is any advice would be helpful. Were going to try to replace those parts today by going to the dealer so ill update you guys with the results.
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  #6  
Old 12-15-2011, 07:53 AM
eaMonkey eaMonkey is offline
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Turned out it was the water pump
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Old 12-15-2011, 08:41 AM
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Quote:
Originally Posted by eaMonkey View Post
Turned out it was the water pump
If you`ve been driving it around like that for the last 2 months, you`re gonna have more problems than just the water pump....
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