My 2007 Grand Cherokee Rocky Mountain Edition overheats intermittently
-4.7 litre engine, with electric fan, and pulley driven clutch fan.
-Electric fan does come on with a/c, or when engine reaches a certain temp. Revs up
after running a while.
-Clutch fan spins easily when cold or even when temp gauge says warm.
-Overheats in rush hour traffic, when not moving, at the drive through, but cools as soon
as you began moving again, or rev the engine for 15 seconds.
-Coolant reservoir is full
-Radiator hoses are cold even when the temp gauge shows warm temp.
-Heater today, blowing cold air even when the temp gauge said warm.
Not sure if this sounds like a fan clutch, thermostat, or coolant, or ?? Can you please
advise me how to fix? Thank you!
Sounds like a thermostat issue.
The fan clutch should have some resistance at all times, more when cold. You may also have an air pocket in the heater lines, and that brings into question the headgasket, due to previous overheating, combustion gasses getting into cooling system creating a bigger cooling problem than you started with. A block check will tell you if a head gasket has blown, if it is ok then replace the fan clutch and the thermostat and make sure you get all the air out of the cooling system during refill.
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