Im in the process of sorting out a few things on this super clean '84 GL I just picked up. Im concerned about the heater.
The heat output simply isnt what it should be. Coolant is topped of, and I have replaced the t-stat with a brand new OEM 192 degree unit. Motor is running great, and gets up to temp quick, and does not overheat.
The Heater controls seem to be working 100%. Controls from A/C and recirc, panel heat, floor heat, and defrost all work great, and blow strong. The heater temo control seems to work the valve 100%, from stop to stop.
But my heat is only luke warm.
The heater lines are hot. BOTH into and out of the cabin.
So....
My first thought is that the heater core is clogged, and it forcing the system to bypass.
Can somebody shed some light on the heater core temp valve? Is it known for being problematic? is there a way to service it?
Im going to try to back-flush the heater core this weekend, in hope of saving myself a heater core project this year.
Any suggestions otherwise?
Thanks!