Question about 1998 Jeep Cherokee

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2000 JEEP CHEROKEE SPORT W/ 4.0L HAS GOOD HEAT AT IDLE BUT DROPS AS YOU DRIVE IT ALSO TEMP GUAGE GOES BACK TO COLD WHILE DRIVING.REPLACED T-STAT AND FAN CLUTCH ,FLUSH HEATER CORE AND RETEST STILL HAS CONCERN

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May want to by higher rated T stat. Depending on region of the country you can get up to a 210 F t stat.

Did the problem start after a drain of the cooling system? Could be air in the heater core.

Posted on Jan 15, 2009

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I agree with falkner, my fins rusted out in my water pump as well (many times). I actually sued chrysler for this via lemon law many years ago (happened to me 4 times within first 36k)- it turned out that when they built these engine blocks some of the blocks had too much ferite in the block construction this caused rusting out of the water pumps. When your changed your antifreeze did it have a lot of rust in it? - if it did its probably your water pump.. I do however find it strange that your temp gague goes to cold while driving - this is usually a sign of a thermostat being stuck open. Pull your water pump off and check the fins (fan blades on it) first since you just replaced your thermostat.

Posted on Feb 16, 2009

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I had this same exact problem. Itried everything. Finally a vetran mecanic told me it was the watter pump. Apparently the waterpump on this peticular engine have a problem with the fins on the pump corroding, pump still works and spins around but because the fins are shot. the engine loses presure at higher RPM`s. Thats why at idle its fine and driving its not. I did this and mine works fine now.

Posted on Jan 31, 2009

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