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  #1  
Old 01-21-2011, 02:21 AM
Greencheckerman Greencheckerman is offline
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Location: Watford
 
Join Date: Jan 2011
Posts: 1
Mein Auto: Mini Cooper
Question Jumping temperature

Hi. recently whilst in traffic my temperature guage rose alarmingly and at the same time the heating blower went cold. As I got moving again the temperature went down and the blower returned to normal. There is coolant and I know the fan is working as it came on when I parked the car up. Has anyboby any ideas what might be the cause. many thanks
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  #2  
Old 01-21-2011, 09:09 AM
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timfitz63 timfitz63 is offline
MT = Doppler Shifting
Location: Lorena & San Antonio, TX
 
Join Date: Aug 2010
Posts: 858
Mein Auto: 2007 X3 (MT)
My first thought was to be sure there was sufficient coolant level in the reservoir; if it's below the "MIN" mark, the heater will blow cold air. Sounds like you've checked that, though.

My next thought would be the thermostat sticking or a coolant flow line getting blocked somehow...?
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  #3  
Old 01-28-2011, 07:37 AM
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Andrew*Debbie Andrew*Debbie is offline
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Location: Anglesey
 
Join Date: Jul 2004
Posts: 6,250
Mein Auto: Leaf Tekna
Stuck thermostat, faulty water pump, air trapped in cooling system. I'd start in that order.
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  #4  
Old 01-29-2011, 08:15 PM
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Mister Chow Mister Chow is offline
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Location: Toronto
 
Join Date: Jan 2006
Posts: 889
Mein Auto: 1999 528i
We had a weird overheating issue with our 2006 Cooper S. Still under warranty and they replaced the thermostat, the fan and a sensor of some sort. Don't recall exactly what parts but the problem was that the fan wasn't going on when the car was stopped or crawling in traffic.
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