Question about 1999 GMC Yukon
Had the fan and radiator checked out, no problems found, had a new thermostat put in. that didn't help. i am used to gm's running closer to 210 or right under this is runnung alot lower. also rear defrost doesn't work. push the button and it clicks and lights up, but never melts anything. it's on the rear tailgate model. can't find any loose wires or damaged grids. any ideas?
First test your coolant with a thermometer when it gets to full hot. Don't get scalded with the hot fluid.
if it is hot enough maybe the water temperature sensor is faulty. If the sensor is good then try putting the thermostat in a pot of water and with a thermometer test when it opens. sometimes even a new one is not accurate.
To test your rear window defroster,check your fuse, if good follow the circuit with a voltmeter. Wireing diagrams are in the Haynes manual.
Posted on Jan 06, 2009
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Posted on Jan 02, 2017
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