BMW engine overheat message, no CEL error code

Asked by Raj Nov 17, 2020 at 01:18 PM about the 2005 BMW 7 Series 745Li RWD

Question type: Maintenance & Repair

This is regarding 2005 745LI, I have recently changed coolant Thermostat,
Upper and Lower Coolant sensor and Radiator fan. I keep on getting Engine
overheated at 107C. The Water pump is working fine as I can c a steady
stream of coolant in coolant reservoir. The coolant is between Min and Max
range (no coolant leak).

Upper radiator hose is HOT and lower radiator hose is warm to touch.

I am able to drive for 30 mins continuously and the message keeps on
popping and disappears and this cycle continues.

Also the radiator fan does not come on when the overheating message pops
up. Only when I start  the AC, the fan starts.

Any help is demystifying this issue is much appreciated.

Thank you.

2 Answers
41,240

TDolby answered 4 years ago

Properly bleed the system and have the right amount of coolant in the system, If so. the fan not running is probably the issue. Check into the wiring and sensors next. You might need a BMW mechanic to find the issue.l

Mark helpful

Raj answered 4 years ago

Thanks for your prompt response. The Fan runs only when the AC is on and when the overheat message appears, I would expect the fan to go in FULL blast mode. But it does not spin until I turn on the AC unit.

Mark helpful

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