3rd gen .04, i noticed the a/c comp. cycling with switch off and heat on.
is this normal or faulty someone told me that the a/c will come on if the defrost is on checked that its still cycling. any advice?

 

The A/C Compressor does run while the switch is in the Defrost position, even if the A/C is turned off.

 

thanks for the reply, the ac is cycling with defrost in the off position. i was also told to unplug the compressor will this be harmful?

 

The AC coolant is acting as a lube for the system. Need to circulate it to keep things happy.

 

just looking at some of your pics sixgun4x4 is my son he has first gen 92
im a new convert to diesel and having a blast, my son hays all summer here in northeast oregon and works cows in winter.

 

Don't know if it can be done on a '04 but one of the first mods I did on my trucks was to disable the A/C in defrost. Easy mod on a 12 valve, little harder on a 24, not sure on a 3rd gen. Who needs the A/C on when it's 20 below zero?
My understanding is the A/C comes on in more than just the defrost setting in a 3rd gen. In fact I think the A/C is on all but a couple settings.

Anyway here's the disable instructions if you're interested http://dodgeram.org/tech/repair/HVAC/Defrost_AC.htm

 

The AC comes on on the Bi-level setting on my truck. So maybe it does on yours too?

 

Its my understanding that the a/c compressor runs in the defrost mode to help remove moisture from the cabin air, therefore it could be useful even @ 30*. I know when my defrost is running on a rainy/humid days it sure gets a lot of water out of the evaporator box. Hope that helps.

 

Mine always cycles.

 

Like infidel, I dont need the AC coming on when it is so cold and dry (at 0 and below) that my nose is bleeding from lack of moisture.

 

thanks guys!