I have spent 3 hours today, reading, and going out and checking stuff on the truck, as I read about different items to look at.
Temperature goes to just past 200 on the guage, all of the vents appear to work as they should when switches in proper positions, on both ac and heat, defrost setting brings ac on, as it should.
Checked inlet to heater core, hot
, outlet side cool, at operating temperature.
Does this system not have a hot water switch, valve, is it totally dependant on a "blend" door?
Does the coolant constantly flow through the heater core?
Does someone actually recommend CLR for cleaning the heater core?