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2006 325i overheating
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03-12-2010, 06:57 AM | #1 |
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2006 325i overheating
This is my fiance's car. Its got about 104k miles on it and it just started doing this last night. An alarm came on on the navigation screen telling her to pullover as the car was beginning to overheat. I popped the hood and the coolant reservoir was wet and could see where it had made its way to the ground in the same area underneath the coolant tank. We got the car home and I started it up, turned the heat on full blast and it was warm for about 5 seconds and then it immediately went cool.
Could the water pump be the culprit? or maybe the thermostat? Thanks in advanced! |
03-12-2010, 09:56 AM | #3 |
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I checked all the hoses and radiator. Everything looked fine to me. And the only time it leaked was when it got too hot. Are the coolant reservoir caps on these cars vented?
Last edited by Jason R; 03-12-2010 at 10:14 AM.. |
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03-12-2010, 11:20 AM | #4 | |
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Is it throwing any codes? Both the pump and thermostat are electronic, and can report failures. There have been posts on that here, you might want to search for them. Has the coolant been replaced? It was due at 100K (or before.) Last edited by AlanAZ; 03-12-2010 at 11:49 AM.. |
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03-12-2010, 11:45 AM | #5 |
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exactly what happened to my previous car.
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03-12-2010, 12:30 PM | #7 |
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You can have a slow leak which won't throw a code until it gets really low. My E90 330 had a leaking radiator for 2 yrs and I didn't know it until they pulled the head for a valve ticking problem.
Last edited by F32Fleet; 03-12-2010 at 01:42 PM.. |
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03-12-2010, 12:42 PM | #8 |
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From this thread - sorry, not good news, your symptoms seem to match exactly:
txusa03: I replaced the pump, thermostat, and the 3 Aluminium bolts that secure the pump to the engine block, plus coolant naturally. The new thermostat is made of plastic rather than Aluminium - so I guess that is the mysterious 3rd part you mention. tuned2ride: Symptom was amber overheating warning, closely followed by red overheating alarm. I quickly pulled over and stopped engine. Upon checking under bonnet, radiator + hoses were cold, but small amount of coolant had vented. I checked interior heating, and that was cold too. Luckily I was only a mile or so from home so waited for about 10 mins with engine off and drove gently for a minute then stopped for 5 - etc till I got home. I wouldn't necessarily recommend doing this - especially in warmer weather / climate. But in my case I luckily never got another warning on my limp home, and no more coolant was vented. If a significant amount of coolant was allowed to be vented then one could risk causing engine damage. -------------------------------------- I got the red overheating alarm a couple of days and took it to the dealership. They said that I had to replace: Water pump + thermostat + VANOS solenoid. Currently have ~130,000 miles on the car, so I was out of warranty. Last edited by AlanAZ; 03-12-2010 at 12:58 PM.. |
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03-12-2010, 02:42 PM | #9 |
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How much did all of that cost at the dealer?
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03-13-2010, 11:41 AM | #11 |
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i just checked the car this am. I filled the reservoir tank the other night to limp it home about 1.5 miles. i checked it this morning and it was completely empty. So I'm sure its leaking from somewhere. gonna try to find out today.
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03-13-2010, 12:10 PM | #13 | |
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03-13-2010, 08:44 PM | #14 | |
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Last edited by AlanAZ; 03-13-2010 at 09:20 PM.. |
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03-13-2010, 10:12 PM | #15 |
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ok we did a pressure test on it today and it held pressure fine. my fiance's uncle is a mechanic and he came by and we pretty much ruled out the water pump & the thermostat. Looks like I'm gonna trailer the car to my uncle's house, flush the cooling system and refill. Now I would like to get this done tomorrow and need to know what coolant would be best to use since I obviously cannot get any from the dealership tomorrow.
So, what coolant can I use in this thing? |
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03-14-2010, 07:43 PM | #17 |
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i had the same situation.....exactly how you explained.............
i replaced the thermostat and water pump.......problem went away.....
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03-15-2010, 06:24 AM | #18 | |
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i had the car up in the air and did a pressure test. no leaks. cooling system is holding pressure fine. i let the car run for a little while with the pressure tester on there and it never got to the point where it was too hot. Could it be the coolant reservoir cap? But where on earth would the coolant be disappearing and why? I guess I'll try the coolant reservoir cap first. Last edited by Jason R; 03-15-2010 at 06:58 AM.. |
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03-15-2010, 07:55 AM | #19 | |
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03-15-2010, 10:14 AM | #20 |
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03-15-2010, 12:57 PM | #21 |
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03-15-2010, 03:28 PM | #22 | |
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http://www.ecstuning.com/BMW-E90-335...olant/ES10319/ http://www.bavauto.com/shop.asp Try Indy Shops or different dealership. http://www.BIMRS.org |
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