2nd Gen Non-Engine/Transmission A/C blows cold but only on defrost

[Ron Bissett]

I think door is stuck or actuator not working could it be a fuze or vacumum actuator . No air from outlets except the deforst at the windshield. what to do without taking the dash and all apart. ? Thanks for any help.

 

[lbailey47]

Ron... . I've got the same problem on my '98 3/4T Ram diesel w/about 313K miles. Did you get your problem resolved???

 

[Missouri Mule]

If air(hot or cold) will blow only out of defrost vents your in default mode (setting).

Possible vaccum leak, pinched vaccum line (this happened to the Mule many years ago), selector switch.

 

[twheat]

Mine was doing the same thing you describe. It turned out it was a vacuum leak. I was working down by the vp and unknowing disconnected the vacuum line. I found it today plugged it back in and now air comes out all the vents like it should. Let me know if you need me to take a picture. Good luck.

 

[lbailey47]

Solved my problem today. Found that the vacuum line had fallen down on the exhaust & burned in two. I picked up a short piece of hose from AutoZone... about 4"... . and they didn't charge me. I squared off the ends of the burnt hose & used the hose from AZ as a splice by sliding it over the to two ends. Hooray... AC working normal now!

 

[Missouri Mule]

The vacuum line that goes into the firewall on the passenger side needs to go over the heater hoses so the line doesn't get damage by the exhaust manifold.