Question about 1999 Jeep Grand Cherokee
Does the fan kick in.
are all tubes hot front and back.
does the heat in the cabin works fine?
Posted on Oct 18, 2013
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Posted on Jan 02, 2017
SOURCE: Check gauges light comes on
Sounds like a CPU problem. your radiator may need a good flushing a s well. i would also check the heater core for any unusual problems like seal break or leakage.
Posted on Feb 11, 2009
You didn’t mention replacing the temperature sensor located
on the block in the path of the ‘cooled’ coolant.
I can’t tell you any closer where to look for it since you didn’t specify which engine you have.
This device is a solid state item called a thermistor.
With the air temperature around 77 degrees F and a 'cold' engine, it should measure about 10,000 Ohms and hot, around 1,200 Ohms while disconnected from its mating connector.
With the ignition on, and the connector disconnected from the sensor, you should measure about 5 volts coming from the ECU.
If this has failed, the ECU is not getting the right info back from the sensor and doesn’t know if the fan is needed or not.
Posted on May 26, 2009
i would say change the thermostat its a possibilty it's sticking and not opening when it should be i would change it and see what happens from there
Posted on Oct 22, 2009
did u bleed the air from the cooling system? if not u need to do that, u have air pockets getting around the thermostat, to bleed raise the front up as high as poss with a floor jack, fill the radiator and coolant recovery tank as full as poss, then run engine until it reaches normal temp, then shut it down and run cold water over the radiator,this will draw the coolant out and the system will bleed the air out.
Posted on Aug 04, 2010
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