car running hot after water pump & t-stat change - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-24-2010, 10:56 AM
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car running hot after water pump & t-stat change

What's up guys?
O.K here's the situation

i have a 2004 745I with 90k miles.

over the weekend I changed my water pump, thermostat, and coolant, and now my car is running hot.
While driving to work this morning I was running at 108C (228F) with the outside temp being about 12C (52F). If i remember correctly before the water pump change I was running about 96C.
Air in the system?

I flushed all the water from the radiator and the engine block, but I was only able to get about 11 liters of coolant back in out of the 14 liter capacity my engine takes.
This is how I refilled the coolant:

before re-filling coolant I turned ignition on (engine off) set blower level to low, heater temp to max, and started filling overflow tank. When the coolant reached Min in expansion tank I started the car (BLOWER LEVEL high, HEATER TEMP TO MAX), and ran her for a minute or so then closed the overflow tank.

Did I miss Something?
Does anybody know how hot these engines run?
could it be the other t-stat located on the radiator (#16 here) RealOEM.com BMW E65 745i MOUNTING PARTS F RADIATOR
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#2 (permalink) Old 05-24-2010, 11:00 AM
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there is a sensor on the thermostat did you reconect it?
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#3 (permalink) Old 05-24-2010, 12:28 PM
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yes, it has a sensor on the actual t-stat that is integrated to the actual s-stat and there is a sensor on the actual water pump, that was actually replaced as well
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#4 (permalink) Old 05-25-2010, 07:34 AM
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brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice brettski is just really nice
There is a bleed valve at the top of the radiator shroud just left of the expansion bottle (towards centre of the car), you can bleed excess air via that point. One way to get more fluid into an empty cooling system is (when cold) to take the top radiator hose off, and pour coolant into the hose to fill the block, and then into the radiator as well.
Another trap is the thin hose that runs between the radiator and the expansion bottle, if that is kinked or pinched, it won't let any trapped air purge off to the expansion bottle.

Good luck. Let us know if it helps
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#5 (permalink) Old 05-25-2010, 10:47 AM
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you said it was running hot not overheating right...
if so did you get the oem thermostat or aftermarket??
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#6 (permalink) Old 05-25-2010, 02:47 PM
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Thanks Brettski I'll try that when i get home, and let u know
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#7 (permalink) Old 05-25-2010, 02:49 PM
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Quote:
Originally Posted by theluis View Post
you said it was running hot not overheating right...
if so did you get the oem thermostat or aftermarket??

I haven't gotten any overheating warning lights, the hottest Ive seen it get was 110C. and yes the t-stat is OEM
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#8 (permalink) Old 05-25-2010, 03:06 PM
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idk what to tell you then
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#9 (permalink) Old 05-25-2010, 06:12 PM
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have you tried the bleed procedure that brettski, commented about that often works
if not ten i suggest turning the car on and let it get up to temp and listen for hissing noises
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