My 01 Jeep Grand Cherokee recently started overheating and I was hoping to find some help pinpointing the problem. Here is what Ive tried and what Ive looked for so far.
So far Ive replaced the radiator cap and thermostat - neither of which seemed to help. I even took the thermostat out all together and that didnt seem to work.
Here are my most recent observations from tonight (with thermostat still removed).
It took 6-7 minutes to reach a running temp of 210 just idling. Once there, it took only about a minute to get up near 260 when I turned it off.
While running, the large fan directly next to the serpentine belt was running continuously, but the smaller fan nearer the radiator never came on. I didnt try turning the AC though, I'll have to wait for it to cool down and I'll recheck that. I did try the heat while it was running though and only cool air came out.
After I turned it off, the upper radiator hose was very hot to the touch, the radiator cap was warm, the lower radiator hose was cool and both heater core lines were cool to the touch once you got far enough away from the thermostat (hence the lack of heat I assume).
When the engine is off, the large fan nearest the water pump only turns if I have consitent pressure on the blade and the smaller fan nearer the radiator "freewheels".
There are no apparent leaks (no coolant on the ground, no obvious leaks at the thermostat/pump/radiator/hoses/heater core).
Any help in narrowing down the problem would be greatly appreciated? Please let me know if you need more information of if I should snap some pictures.
Thank you
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Tuesday, August 11th, 2009 AT 5:55 PM
