The heater in my '05 Grand Caravan sometimes blows hot and sometimes blows cool. It hasn't overheated and the temp gauge has remained pretty consistent (right in the middle between H and C). I haven't seen any coolant leaks. I've read some posts for similar problems that suggest it could be a bad thermostat, but wouldn't that cause it to overheat?

Has anyone had this problem?

Thanks

 

It could be the thermostat. I had a problem like that. The heater worked fine until i started driving, and then it would be cooler. Replaced the t-stat and the heater worked fine. The reason was the t-stat was sticking in an open position.

 

Thanks. So the thermostat can be bad even though it's not overheating?

 

I replaced everything n I still have have hardly any heat the heat gaguge goes up n dwn start to go to over heating but then drops down to the 3rd red line then goes back down and still has no heat