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-   -   96 740iL - Running hot (http://www.bimmerfest.com/forums/showthread.php?t=396615)

semaj1 09-07-2009 09:14 PM

96 740iL - Running hot
 
my 96 740il runs hot after runing for a couple miles, the temp guage moves over toward the red and then return to normal after a few seconds, this happens continuously every eight minutes or so. I've replaced the thermostat three times and just replaced the radiator. The upper hose to the radiator gets very hot while the lower hose remains cool, this causes the overflow tank to boil over. What could be my problem and a remedy? PLEASE HELP!

Beemaboy 09-08-2009 01:00 AM

It sounds like you either have a huge airlock in the coolant passage or you have a split headgasket...

semaj1 09-08-2009 10:52 AM

Ref: Running hot
 
Are there any other symptoms that would accompany a split head gasket? Would a bad water pump cause this?, because it seems that my coolant is not circulating. Where could I find a cooling system diagram for this vehicle?

CodyItaliano 09-08-2009 03:02 PM

have you ever had the water pump replaced or maybe the previous owner done so? if not, they usually go out every 100000 miles or so, as far as what other owners have told me. supposedly due to the plastic empeller that the oem water pumps have. i'm told its best to go aftermarket with a steel or aluminium empeller.

PETER NEWMAN 05-29-2010 06:57 AM

over heating
 
Check or change the fan viscouse coupling.


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