overheating when idling or up hills - Engine Troubleshooting


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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

carriejj
New User

Jan 8, 2007, 12:02 PM

Post #1 of 3 (1847 views)

overheating when idling or up hills	Sign In

my 1990 Isuzu trooper wants to overheat when idling or going uphills, but is fine everywhere else. It's been doing this for about 2 years and has recent new radiator and hoses, water pump, timing belt, and spark plugs. any ideas? thanks

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 8, 2007, 12:24 PM

Post #2 of 3 (1844 views)

Re: overheating when idling or up hills	Sign In

Sounds like a fan for radiator problem. If a clutch get a new one if more than a few years old. Next would be the quality of the condition of the radiator. Take a look at it you may see that it's junk from the outside, T

DanD
Veteran / Moderator
DanD profile image

Jan 9, 2007, 5:26 AM

Post #3 of 3 (1838 views)

Re: overheating when idling or up hills	Sign In

I agree with Tom have the thermostatic rad fan clutch tested. It sounds to me that there is not enough airflow through the rad at times to cool the engine.
These fan clutches are designed; that at low RPM and/or high temperature the clutch locks up and drives the fan blades as fast as the engine is turning; drawing lots of air across the rad fins. This also takes a far bit of power for the engine to drive the fan; lowering performance and fuel mileage.
When you’re cruising down the highway under light load there is enough air flowing through the rad to keep the engine cool. At that point the clutch relaxes and allows the fan to free wheel. Giving the power to drive the fan back to the rear wheels, increasing performance and fuel mileage.
Sorry for the fan clutch 101 explanation but I thought if you knew what it was you’d understand why we’re saying have it checked.
Dan.

Canadian "EH"

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