The last couple of times I tried to put the heat on it only blows out cold. I tried every button. The car tempeture is always perfect and never over heats. Leaving out the thermostat, I believe. Help is welcome.

Thx

Baphomit

 

Look up Heater Control Valve stuff.

 

Heater control valve, check the vacuum line.

 

make sure you have enough coolant as well and no air in the system.