Question about 2000 Jeep Grand Cherokee

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My jeep is heating up to about 235-240 after about 10 minutes of driving with A/C on. It usally takes about 30 minutes or more to heat up without the A/C on. I have replaced the fan clutch and thermostat because mechanic said they were bad. Problem not fixed. I replaced the radiator cap and problem not fixed. One mechanic told me I have a clogged radiator and another told me to replace the fan relay. He said the fan was staying on low and kicking into high. This is why My a/c is not as cold as it used to be. Does any of this make sense? I started the jeep and the fan did not kick on so I started the A/C and the fan kicked on. when I turn off the jeep the fan keeps spinning for about 30 sec. until it stops. Is it supposed to do that? The other fan (connected to the serpentine pullies) stops a lot sooner. Should either fan spin when engine is off? What is weird is the car will be about 230-235 and I will shut it off for about 5-10 minutes and then start it up and it will cool back down to 215 fairly quickly for a while then heat right back up again. Anyone have any suggestions? (FYI Water Pump was replaced last summer.)

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Sounds like a partially obstructed radiator, either external, leaves between a/c condenser and radiator, or internal...some cores plugged ...radiators are actually too small for engine in the first place, making them what I consider marginal even when new. A good clue to an internal blockage is if the radiator cannot be filled quickly...a really bad one requires coolant to be literally dribbled in when filling, but likely yours isnt that bad yet. Everything else you mentioned seems normal

Posted on Jul 17, 2009


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