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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 10-01-2013, 07:06 PM
unotdad unotdad is offline
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Engine over heating

I have a 2005 BMW 745i and my engine temp to high light came on . Can somebody tell me what could've caused this
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  #2  
Old 10-02-2013, 07:07 AM
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tim330i tim330i is offline
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Welcome to Bimmerfest. I've moved your thread over to the E65 7 series forum. You'll be able to get help from other 7er owners here.

Good luck,
Tim
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Old 10-02-2013, 08:17 AM
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samadkins29 samadkins29 is offline
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Stuck thermostat most likely. If your coolant is not low. If it is low, then you have a leak.
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Old 10-02-2013, 11:50 AM
ssdriver27 ssdriver27 is offline
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I wouldn't recommend driving it till you figure it out. could lead to MUCH more expensive fixes.
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Old 10-02-2013, 11:58 AM
ssdriver27 ssdriver27 is offline
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First check the fluid level for your coolant and engine oil, check the thermostat, checking those things should give you an indication of what's causing your overheating problem.
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  #6  
Old 10-03-2013, 11:45 AM
Thesatman Thesatman is offline
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As was mentioned...

1. wait until the car engine is cool.
2. Slowly open the expansion tank on the passenger side of the engine bay.
3. Listen for the sound of air under pressure excaping.
4. With cap removed, peer down inside and check the level of coolant.
5. While you are at it check the color of the coolant, it should be blue. If it is any other color then I would flush and replace it with BMW coolant.
6. If there are no indications of anything strange up to this point then with the cap OFF, start the car and turn the heater on inside the car. Let it run for a couple minutes.
7. Replace cap, with car running access the diagnostic menu (sometimes called hidden menu- do a search if you don't know what i'm talking about) and monitor the coolant temp for about 10 minutes. If it ever drops in temperature make a note of the temp that occured at. If it goes above 107 degrees C then turn off the car.
8. Wait for the engine to cool (this is going to take a while unless it is really cold outside) and remove the cap on the expansion tank and check the coolant level again. If it still full then it is time to move on to components like the Tstat, water pump, or radiator. REport back with results and we can troubleshoot further if needed.

Good luck.
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Old 02-15-2014, 11:45 AM
unotdad unotdad is offline
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thanks it was the thermostat and it was easy to replace
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  #8  
Old 02-15-2014, 11:48 AM
unotdad unotdad is offline
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Thanks the problem was the thermostat and it sits right in the front so it was pretty easy to replace
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