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Unread 08-31-2013, 10:41 AM   #1
ashjeep
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Join Date: Aug 2013
Location: Surrey, byfleet
Posts: 1
Overheating Problems Please help!

I have recently got a jeep liberty 3.7l v6. The car runs fine and heats up as normal. The temp gauge stays at mid temperature until I hit speeds of 40+ mph. It then climbs to approx 3 quarters and higher the faster I go.
I pulled over and the coolant fluid was bubbling over spilling loads of coolant out of the overflow and all over the back of the engine bay.
Is there one fan I should check or two? is there a way of determining whether perhaps the fan is not working? The pipes at the top of the fan in front of the radiator do become hot after running for a while which I have been led to believe means the temp valve is not stuck shut?
I know the fan relay units are not the best design but not 100% its the fan.

Any ideas or tests I can do with the fan, rad, coolant system or relay would be greatly appreciated. I am no mechanic but would rather try to diagnose the problem and pay for it to be fixed rather than continue to pay to diagnose faults at a garage.

Many Thanks

Ashley

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Unread 09-01-2013, 10:31 AM   #2
Bain98xj
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1998 XJ Cherokee 
 
Join Date: Dec 2009
Location: howell
Posts: 395
I actually had a very similar issue juat coty driving it was fine got on the highway and it hit the 3/4 mark pulled over it cooled right down. I ended up finding the propeller on the water pump was cracked and free spinning. New pump problem fixed
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Unread 09-01-2013, 11:53 AM   #3
Leeann_KJ
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2005 KJ Liberty 
 
Join Date: Aug 2013
Location: Edgewater, Maryland
Posts: 77
It's not the fan. The fan is designed to help cooling under 30 mph. Anything over that and the air moving through the rad is plenty.

Either your rad is clogged or your water pump has failed.
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Unread 09-01-2013, 12:01 PM   #4
wingit
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Join Date: Jun 2008
Location: Chicagoland Suburbs
Posts: 79
Not the fan it's for slow driving. I would check the water pump.
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Unread 09-01-2013, 12:45 PM   #5
tommudd
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2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,109
and thermostat as well
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