Check Engine Light and/or Engine Overheating on BMW 325i

The thermostat may fail resulting in engine overheating and/or illumination of the Check Engine Light. Replacement of the thermostat along with a complete inspection of the cooling system will be necessary to correct this concern.

Overheating can cause severe engine damage. If the engine begins to overheat it is recommended to stop at the first available location and have your vehicle towed to a repair shop.

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Average mileage: 112,569 (52,000–190,000)
7 model years affected: 1995, 2001, 2002, 2003, more2004, 2005, 2006
37 people reported this problem
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problem details
2006 BMW 325i 92,000 mi,
My thermostat needle was moving from even to hot (H) up and down as i drove. it stayed on hot for a few mins or until i stopped the car and turned off ignition and when i turned it back on it was fine. thought it was the thermostat sticking. It was fine for about a month and a half. Then started getting hot one day out of the blue. Once again the needle was not still for too long. This time went from H to C and back to H. Then finally overheated and turned off about 10 mins right when i got to a place i could pull over. We let it cool down and saw that it was out of water. We put water in it. It started and was fine for about 10 miles then overheated again. Pulled over again and filled up the radiator this time to the top. But car would not start back up. At the shop now.
2006 BMW 325i 52,000 mi,
Amber temp light illuminated. Then went off. It came on again 10 minutes later and quickly changed to red. After cooling, took it to closest mechanic (2 mi) for a quick look. Had towed to BMW mechanic. Determined to be electric water pump and/or thermostat. Told have to remove water pump to get to thermostat so might as well replace both.
2006 BMW 325i 164,000 mi,
Car was over heating so I bought a new water pump and thermostat on eBay for $400, followed the instructions on YouTube and managed to fix the problem myself.
2006 BMW 325i 92,000 mi,
Same problem as another customer. The amber temp light came on, quickly turning to red. Took to mechanic and at first he could not find the problem. Took back and he determined that the thermostat was stuck and needed replacing. I don't have the car yet, so I hope that the new thermostat will solve the problem.
Got hot and it died well not start. Pushing antifreeze out of the radiator when the radiator cap is off
2006 BMW 325i 118,000 mi,
Overheating light only comes on when its cold outside. If you cut the car off it and wait a few minutes it stays off? Then today one of the hoses blew off and I had it towed to the repair shop.
2006 BMW 325i 68,000 mi,
I had to have the thermostat, water pump, and coolant extension tank replaced all at the same time.
2006 BMW 325i 89,000 mi,
Temp light flashed, then red, as I attempted to pull off freeway radiator busted
2002 BMW 325i 145,000 mi,
Thermostat was already replaced at an earlier date when my check engine light trouble started. After a very expensive part replacement related to the exhaust, I found the light was still coming on. That repair was not needed. The real culprit was a fuze that went up.
thermostat failed causing check engine light. replaced thermostat
2006 BMW 325i 112,000 mi,
Overheat while driving on I15 south with outside temperature of 79.
2006 BMW 325i 112,723 mi,
thermostat light came on, let car cool, and than low coolant light came on.
2005 BMW 325i 85,000 mi,
Red overheat light appeared out of nowhere.
2004 BMW 325i 160,000 mi,
Service engine light stays on: have serviced engine, have replaced radiator twice, all upper and lower hoses, head gasket, machined the heads, replaced alternator, changed all plugs, replaced sensors, replaced ruptured expansion tank, replaced thermostat, now will clean injectors, (already seafomed them twice), check valve covers since the codes suggest misfiring on 4 of the cylinders, (seriously, I can hear the freaking car missing from a mile away), also we have a vac problem. Only run 93 octaine gasoline, keep full synthetic oil changed and use only OME filters. Only tow the car to the shop, will not allow her to run hot. So tired of borrowing my mom's 2003 Mercury Sable with over 175,000 on the odometer and still running great! (call her old reliable) I have founded the BMW Caregivers /Survivors Support Group, and am looking for hospice and respite care for my bmmer! OH, THERE IS NO SOLUTION
2002 BMW 325i 133,000 mi,
The automatic transmission will not operate into reverse.
2001 BMW 325i 165,340 mi,
My car Overheated while i was driving And The AntiFreeze droped then i refilled it up and still the car was over heated and wasted antifreeze
2003 BMW 325i 145,000 mi,
I have a bmw 325i it star get hot and i change the water pump and thermostat. I didn't stop i change the expansion tank it has a crak it didn't stop and change a thermostat is located insaid of the expansion tank .so i don't know if change the radiator or what. I help some one can help me. Tanku
2004 BMW 325i 65,000 mi,
Engine light on, took it in an have it replaced with only 65,000+ km. A little over 2 years later took it in again with the same problem. Now it is at 85,000km. Changed the whole thing which cost me a bundle. Either the part is defective or the workmanship not up to par. The thermostat should last longer than 2 years since it had lasted 65,000+ km the 1st time.
1995 BMW 325i 180,000 mi,
Won't turn over no start no crank nothing!!!!! What's the problem
2006 BMW 325i 160,000 mi,
sensor light came on. Put coolant in the tank, it came on again. Havent taken it to the dealer yet. Not looking forward to this.