Replaced thermostat and heater only gets luke warm.
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1996 GMC Suburban 1500 Question: heater not heating
Answer #1jason94 March 29, 2010, 21:01Journeyman
Maybe the thermostat is staying open too much. Is the engine warming up fully-if not then recheck the termo. and make sure it opens at the right temp. Also, you may have another coolant system issue that is related to this.
Answer #2Visitor, September 09, 2010, 16:50
I had a very similar problem. The heat was barely warm and the higher you turn on fan, the cooler it got. For me, I had to replace the heater core and that solved my problem. Just one solution to think about.