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My Jeep Commander is loosing power and overheating


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More than likely the viscous fan no longer works as it should. When it starts to fail it slows down the fan's rotation speed, so check if you can spin the fan by hand when the engine is switched OFF. There should be no free rotation when you try to spin the fan, or, you can take the vehicle to Barry to check out the condition of the radiator fan.

Interpreting the condition of a viscous fan requires some experience of these fans, so don't think it "looks OK". Have it checked out by a professional mechanic. 

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13 hours ago, gautam said:

More than likely the viscous fan no longer works as it should. When it starts to fail it slows down the fan's rotation speed, so check if you can spin the fan by hand when the engine is switched OFF. There should be no free rotation when you try to spin the fan, or, you can take the vehicle to Barry to check out the condition of the radiator fan.

Interpreting the condition of a viscous fan requires some experience of these fans, so don't think it "looks OK". Have it checked out by a professional mechanic. 

+1

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check the coolant age as it\f it's more than 3 or 4 years you need to replace it

Check the coolant pump pressure as the coolant is not circulating efficiently it would over heat faster than usual

check coolant thermostat (the therm-mechanical) as if it's not opening on specified temperature or opening partially it would over heat

and finally (worst case scenario) use a towel to squeeze water hose during over heat if it's sold and not flexible to be closed by hand pressure so you have a gas leak from cylinders heads to cooling jacket that would require replacing heads gaskets and some time surfacing the heads.

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