Hello everyone...

I have no heat at all at idle (blows cool) then when driving or the RPMs go up the heat is luke warm at best....its been getting progressively worse

I am in the auto business so we have checked all of the obvious

My TL has 190,000 miles FYI (highway)

-New thermostat.
-No coolant leaks
-Coolant is completely full
-Bled system of air
-Heater control valve does move when changing temperatures

I am leaning towards heater control valve issue though as I see some people have had this problem?

Advice?

 

did you make sure the thermostat was installed in the proper orientation? Some people have had issues with that. That, or the oring was improperly installed

 

yes it is installed properly

when the problem started I replaced the thermostat

same problem before and after

 

check out this DIY theN: https://acurazine.com/forums/third-g...ve-diy-747304/