I replaced my heater core, thermastat, and heater valve and still no heat. Why?
Wednesday, January 26th, 2011 AT 1:36 PM
1 Reply
JACOBANDNICKOLAS
MECHANIC
109,755 POSTS
With the engine running, hot and the heater on, feel both heater core hoses. If both are hot, then the blend air door is sticking. If only one is hot, chances are there is an air block.