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Climbing hills on the highway for extented periods causes the temp to rise steadily until it hits the red, on the flats no problem, has new head and thermo working new thermostat as well of course, fins are not blocked raidiator in good condition, thanks Grant

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I have had a lot of people askeng aboutthis problem, climbing hills tax the trans and causes heating as the trans is cooled by the radiator, have a cooler installed, usually clears the problem and saves the trans , after all heat is the main reason trans fail

Posted on Nov 11, 2010

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Make sure the thermo fan is working correctly also it can cause this problem to

Posted on Jan 04, 2015

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My 2004 3400 closed system ,runs hot in town unless heater is on. driving up a mountain pass it gets very hot.on a flat highway runs normal. new t state,resivior cap, both fans work no leaks or smell


Radiator fan motor or radiator fan thermostat defective/

Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

Highway driving ample air passing through radiator without fan.

Hill climbing requires cooling fan/

Hope this helps?

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Nov 17, 2016 | Cars & Trucks

2 Answers

Over heating during offroading


I am assuming you have the 4.3L V6 and it's 4wd. I use to have the same problem with a 96 S10. Typically when climbing hills it harder for the oil get pumped to the top of the motor, which can cause overheating. One little trick you can do is swap out the thermostat with one of a lower temp. Basically the thermostat is what controls coolant into the motor, On your Jimmy it opens at 190degree's, so no coolant flows through the motor until it hit's 190. You can replace the thermostat with one that opens at 160 or 165, this will allow more cooling time for the motor. I also had a 89 Jimmy that had this problem, infact my Jimmy overheated on the highway on hot days, I had put in a lower temp thermostat and problem solved on both these trucks.

Good Luck

Hope this helps

Jul 01, 2008 | 2001 GMC Jimmy

1 Answer

Lacks power in highway hills


Hi,

I am assuming that you have no issues with the engine whatsoever, then the only possible areas to check would be:
1. axle gear ratio - to my knowledge a Wrangler would be 4.11 while some Cherokees could be anywhere from 3.54-4.88;
2. flywheel - a lighter flywheel could cause the engine to loose easily its momentum hence difficulty on an a rise.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

May 25, 2008 | 1997 Jeep Wrangler

1 Answer

1998 toyota hilux 3l diesel overheating when goin up long steep hills.


if its not going int o red zone it is normal to get hotter as she climbs hills

Oct 15, 2012 | Cars & Trucks

1 Answer

1998 subaru forester overheating heater blows cold air


Any chance of a head gasket leak? Is the coolant level still full? These were known for head gasket issues. Coolant is a closed system and level will not drop unless there is a leak. Make sure there is no air in the system. Replace the radiator cap to make sure that it is operating properly.

Mar 02, 2017 | 1998 Subaru Forester

1 Answer

My 2002 jeep grand cherokee will sometimes over heat when climbing big hills. It has been an intermitten problem. A shop replaced the clutch fan, water pump and thermostat. After repaired ran it well over...


you mention big hills, and other wise no problem, you may be taxing the transmission , have a trans cooler installed, it may cure all your problems, and good for the trans, heat is the trans biggest killer

Nov 11, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Just had 200,000 km service now 205. regularly serviced. 2 weeks ago noticed engine heat rising well over half way. pulled over standard procedure. Now 2 weeks later after nursing Suby have taken to...


check the coolant temp sensor , fuses , relay and fan for operation if electric fans
if manual fan replace the viscous fan hub
have a pressure test done on cooling system to check for cracked tanks or other leaks
over 5 years old and never changed the water conditioner (antifreeze/boil concentrate ), consider replacing the radiator

Apr 24, 2017 | 2003 Subaru Forester

1 Answer

Lacks power


after the blue indicator went out, the power came back. Must be a cold run inhibitor

Jan 05, 2009 | 2005 Volkswagen New Beetle

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