Re: heater only blows warm air when heater is on
I finally changed out the heater core after having back flushed the system, checked blend doors, and replaced the thermostat and the problem has been resolved and my heart it's actually hot again. It is a labor intensive job to replace the core which makes it a little pricey. Appears there was probably a partial clog in the core and was not letting the hot coolant throughout the entire core to warm it up. According to the mechanic there are different chambers and routes that the fluid can travel and therefore just because your tubes that go to and from the core are hot, doesn't mean the entire core is getting the same heat. Hope this helps anyone else.