I have a 1994 Dodge Dakota sport with 4x4 and the 3.9 v6. It has a new heater core and thermostat and the heat works...barely. It doesnt get very warm at all, hardly even takes the frost off the windshield. Have any ideas??

 

have you flushed the radiator?

I have the same problem with mine, i was working of flushing the radiator at work and only did a half *** job cause we got busy, but it seemed to help a little.

 

What temp thermostat did you put in? If its the 195 there should be no problem, if its the 180, it won't produce much heat.

Otherwise, it might be air in the heater lines or core.

 

does the fan just blow slow? or is the temp gauge reading low?

 

Your selector doors may not be working as well.