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7 Series - E38 (1995 - 2001)

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  #1  
Old 09-07-2009, 09:14 PM
semaj1 semaj1 is offline
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Location: Georgia
 
Join Date: Sep 2009
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Mein Auto: 1996 740il
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!

Last edited by semaj1; 09-07-2009 at 09:18 PM. Reason: added info. about temp guage.
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  #2  
Old 09-08-2009, 01:00 AM
Beemaboy Beemaboy is offline
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Location: South Africa
 
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Mein Auto: 320I, 525I and 740I
It sounds like you either have a huge airlock in the coolant passage or you have a split headgasket...
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  #3  
Old 09-08-2009, 10:52 AM
semaj1 semaj1 is offline
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Location: Georgia
 
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Mein Auto: 1996 740il
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?
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  #4  
Old 09-08-2009, 03:02 PM
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CodyItaliano CodyItaliano is offline
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Location: Corpus Christi, TX
 
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Mein Auto: 2001 740i
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.
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  #5  
Old 05-29-2010, 06:57 AM
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PETER NEWMAN PETER NEWMAN is offline
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Location: RAINHAM KENT UK
 
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Mein Auto: BMW 635 CSi BMW 730i E38
over heating

Check or change the fan viscouse coupling.
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