We have checked hoses, changed the thermostat , checked antifreeze ratio and checked the blower fan. Everything works except that we only get coolish warm air coming out of the vents. What could be the problem? Does anyone know?

 

Sorry forgot to say we have a 96 shortbox standard 3.9L 1500 ram.

 

Probably got an air bubble in the heater core. They are a pain to get out. Install a flush T in the outlet from the heater core, use it as an air bleed. Get all the air out, and your heater should burn you out of the truck.

 

Is the engine getting up to temp?
If it is, then its likely a clogged heater core, or a blend door problem.
Might wanna try bleeding the cooling system as well.

 

I had to use an air compressor to blow out my heater core at the beginning of last winter.

 

Thanks for all your suggestions will check it out and see what happens. Thanks again.

 

Air doesnt always help. Water pressure is easier and more fruitful. Usually gunk built up.

 

I spent 2 years without heat. Replaced EVERYTHING.. Took it down and had the heater core flushed.. Oohhh its sooo nice. =) I actually have to turn the heat temp down. LOVE IT. Easy fix. I didn't even get charged full price. Cost me like 40 bucks, but you can do it yourself also.. I was sick of working on it.