Have a 99 seville sls this morning the heat stopped working out of nowhere. checked coolant, seems ok no leaks from heater core hoses. fan works just blows cold air. hoping its not the heater core. any suggestions?

 

If it was heating before and just suddenly stoped it may be an actuator door on the heater. NO fun to get to to check or fix. part is about $100 shipped form GM parts Direct, or about $250 at GM. cant say that is your problem but it might be.

 

Have your heater box inspected. It is possible for the flapper to be jammed or broken, might be a bit costly to fix though .

 

the actuator door comes to mind.



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sorry lol move south......... lol just one of those moods..... lol. .............. pretty simple i know!?!