my girlfriend has a 2000 dodge grand caravan with a 3.8 in it and she told me that the heater hasn't been working right so i drove it around for awhile and it dont overheat or stay cold on the temp gauge the blower motor seems to be working good but im not a dodge guy can some one tell me why it wont heat thanks in advance

 

first check and make sure the coolant is full. That is the most common cause. If it is, go up to the DIY section and find the control head self test proceedure and run the calibration and see if that helps and if you get any codes.

 

Same problem here changed thermostat still no heat

 

What year and engine?