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7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 12-06-2010, 10:06 AM
cadensdad8 cadensdad8 is offline
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Location: germany
 
Join Date: Dec 2010
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Mein Auto: 1991 bmw 735i
1991 735i overheating.

My 735i just recently started overheating. For a while it would get hot out of no where and then all of a sudden cool back down to norm temp. Now it gets hot after just driving it around the block. After looking it over today i found that the water hose coming out of the water pump was cool to the touch. Does this mean that the pump has gone bad or could there be another problem. After i turned the car off i squeezed the hose to see if there was any pressure inside and it sounded like it released a bunch of air pockets within the hoses. Any ideas? Thanks for reading and for any advice that can be given.
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  #2  
Old 12-06-2010, 12:09 PM
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drivinfaster drivinfaster is offline
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Location: in the sticks you piney
 
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Mein Auto: rescued bmw's
what is your coolant level and condition?? the first thing you check is coolant level, if it is low, refill it and check for leaks.

if it is not low, then verify the operation of the thermostat, and the waterpump is circulating properly.

an infra red thermometer would be helpful for reading temps quick and easily when inspecting for a faulty thermostat.

good luck.



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Old 12-07-2010, 08:44 AM
cadensdad8 cadensdad8 is offline
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Location: germany
 
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Mein Auto: 1991 bmw 735i
1991 735i overheating

I forgot to mention that the air blows heater blows cold while the engine is overheating. The temp. also increases when the heat is on. But once it cools down it will blow warm air. Also the air smells like coolant when it comes on. Let me know if this gives anyone any new ideas. I was thinking heater coil. Where exactly is that located in the vehcle?
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  #4  
Old 12-07-2010, 11:56 AM
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TerryY TerryY is offline
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Location: Woodland Washington
 
Join Date: Jul 2003
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Mein Auto: BMW '95 840
Sounds like you have an air bubble in the system. Time to bleed it. A cold heater and a hot engine are the main signs of a big bubble.


Should be a bleeding procedure for your car in here somewhere: http://www.e38.org/e32/
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