I have an 01 ram 2500 4x4 (yes like many others with a cracked and busted dash ) with the heat setting on anything the A/C pump kicks on and off just like it is suppose to with the defrost on but it dont matter where you direct the heat the pump still kicks on and off. My truck dont heat very well any way could this be part of my problem????

 

If you have it set to the floor, compressor shouldn't run...... I think.

How does your cooling system look? Is it full? Is it clean?

 

The compressor should only cycle when the defroster is used. There was a thread a while back with the same issue. I can't find it and I don't recall the fix. Sorry

 

I know thats the problem that I am having and dont know what to do to fix it. Could that be why it dont get hot air just luke warm air?

 

All I can think of is maybe the switch or blend motor is bad. So when you turn the **** to full hot, either one might be sending a signal that the dial is still on the blue(cold ) part of the dial. I searched for a half hour and could not find that thread. Damn. sorry again!

 

An easy way to tell, would be to unplug the pressure switch on the accumulator so the compressor won't kick on.

 

Would disconnecting pressure switch set a code? What about unplugging AC Comp Clutch connector?

 

No. There shouldn't be anything in the air conditioning that would set a code.

And for the OP try back flushing the heater core, I had to do that about a month ago for a neighbor to get his heat back.

 

sorry it took so long to get back I will try to unplug the pressure switch. Would you back flush heater core with garden hose or switching the heater hoses around?

zman thats fine thanks for looking for the old post and trying to find it.

 

I just used a garden hose.