Temp Gauge stays cold??? - BMW Forum

JohnU · 12-25-2009, 01:29 PM

Hello again,

I recently semi flushed my cooling system ie: ran water through it (no detergent) let it warm up emptied re ran water through it three times and then replaced coolant to 50-50. Since then my temp gauge stays cold for a VERY long time (15-20 min) before coming into the normal op. temp. range if at all. It does move but stays in blue. Any worries here?? What could cause that? oh 91 750il. Cool is better than hot but this cool?

Thanks
John

BimmerE39 · 12-25-2009, 01:32 PM

It's possible you have a busted thermostat. When my thermostat housing broke I had a similar issue. It's also possible that your coolant temp sensor is faulty as well.

drz · 12-25-2009, 02:46 PM

How cold is it outside? This could be a factor.

Also, I think your car uses an electronically-controlled thermostat. If a sensor or other electrical connection is performing under par, it may affect the cooling system's control loop.

JohnU · 12-27-2009, 10:14 AM

Temp is in the 40's lately. Seems strange that a therm or sensor would go out right after a flush but who can predict right? well will be checking both.

Thanks

drz · 12-27-2009, 10:42 AM

Yeah. Check and clean connections.

marti5 · 12-27-2009, 01:53 PM

Check your fuses..

JohnU · 12-28-2009, 09:59 AM

Quote:

Originally Posted by marti5

Check your fuses..

Checked fuses, at least the obvious ones all are fine. Where is the temp sensore located on an e32? There is a coolant level sensor on he resevoir tank but cant find any other sensors in the line or is that it?. (man I need a book for this car)

Thanks

marti5 · 12-28-2009, 10:45 AM

5 & 7 here:

RealOEM.com BMW E32 750iL COOLING SYSTEM PIPE

Which one is your problem Im not sure as ive never had a V12

JohnU · 12-29-2009, 11:55 AM

Quote:

Originally Posted by marti5

5 & 7 here:

RealOEM.com BMW E32 750iL COOLING SYSTEM PIPE

Which one is your problem Im not sure as ive never had a V12

Thanks for the site. Will check.

JohnU · 12-30-2009, 12:39 PM

Ok maybe I ride the short bus. I cannot find the cooling pipe that holds the sensors. I looked around the waterpump inlet/outlet hoses and nothing. Grrrrrr! any idea what part of the motor? front lower/upper, rear mtr, TRUNk?

Thanks

marti5 · 12-31-2009, 06:26 AM

The part in the diagram is located at the rear of the engine from Bank 1 to Bank 2

JohnU · 12-31-2009, 01:47 PM

Thanks again!!!

JohnU · 01-04-2010, 08:45 AM

Thanks again guys, it turned out to be the connection. All is well in the cooling dept. again.

witeshark · 01-04-2010, 10:11 AM

Glad you got it sorted!