Question about 1999 Jeep Grand Cherokee

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Heat not hot replaced water pump and thermostat and radiator cap

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Heater core blocked ,drain antifreeze first then use caustic soda in engine for half hour then flush and refill ,should work then

Posted on Dec 30, 2010

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  • Master
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Check your heater core for water flow. Do this by warming up the car to operating temp. Then touch both hoses at the heater core under the hood. The hoses should be about the same temp. If not then your heater core is clogged. You can try to back flush the core by removing hoses from the engine, not the heater core( the nipples are fragile) and shooting water or low pressure air through the hose that was the coldest. Do not exceed the pressure on the radiator cap.

If the temp of the hoses is about the same then the problem lies in the blend door of the heater or the heater control.

here is a link to a do it yourself repair.

http://www.youtube.com/watch?v=kIWnuZ8vkEE

Posted on Dec 30, 2010

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Posted on Jan 02, 2017

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SOURCE: 2001 Jeep Cold RAdiator

Does your temp gauge read normal? if it does then the thremostat is ok,but sadly the water pump is going bad this is typical of jeeps at an idle the heater cools off because the water pump fins are worn enough to not circulate through the heater core and when you step on the gas the increased rpm move the water fast enough to circulate through the heater,it is possible that the heater core is plugged but I doubt it as a plugged heater core would not get hot either it would be cold or just luke warm all the time.

Posted on Dec 30, 2008

fixitriteman
  • 431 Answers

SOURCE: over heating, engine only, just had radiator replaced

Thermostat, is where top radiator hose connects / it could be that it is air locked /also could be water pump after removing the thermostat you should be able to see if water pump is circulating. if it was a used radiator ? it could be just as bad as the one you just changed / Have it flow tested .gallons Pier. minutes. also mack sure no kinks in hose./ let us know .Thank You.

Posted on Apr 05, 2010

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