Question about 2001 Jeep Grand Cherokee

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My Jeep looses oil pressure when the car is idling and if it is idling too long the engine temp goes up past center and keeps climbing. I have had the water pump replaced 2 times and i believe the thermometer too. Anyway i can diagnose the problem and fix outside the shop?

Posted by Anonymous on

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Oil pressure will drop at idle because the pump is driven by the engine. It should not go lower than 20psi. (I prefer to see at least 30) Very low pressure indicates bearing wear and pump replacement will not fix that.
Pressure may also be influenced by engine temp and if yours is getting hotter than it should, that accounts for a few psi as well.
Your water pump only needs replacement if it is leaking or the shaft bearing is loose. It actually will continue pumping even if both things are wrong with it.
Overheating at idle is generally caused by internal blockage of the radiator, bugs, or leaves packed into the front of the A/C condenser, or trapped between the condenser and the radiator. Your cooling fan must be operational as well. electric fans should come on at just above normal operating temp and the mechanical fan must not freewheel when the engine is hot (it has a fluid clutch or spring driven clutch that allows freewheeling cold , and locks up when hot).
If your thermostat is new, check that it is not in backwards (spring end goes towards the block) and that it is centered in the hole.
When adding coolant, always run the heater while re-filling to eliminate air pockets, and always make sure the thermostat has opened so all the coolant can be added (fill when running)
I am assuming that you have no other leaks or problems.

Posted on May 08, 2010

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My Jeep looses oil pressure when the car is idling, and if it is idling too long the engine temp goes up past center and keeps climbing. I have had the water pump replaced 2 times and i believe the...


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