1999 GMC Sierra Heater temp control

1999 GMC SIERRA
182,000 MILES • V8 • 4WD • AUTOMATIC
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RSNIDE
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Heater temp is hot while turned all the way up and goes cold when turned down even just one notch. At times, heater remains hot through all temp control settings
Jan 6, 2010 at 4:39 PM
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