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#10875831 - 05/27/15 01:42 PM a/c only blows on defrost
Brad Hardt Offline
TFF Team Angler

Registered: 03/16/10
Posts: 3615
Loc: Argyle
02 dodge ram diesel . I had a couple pieces of rotted connections to the vacuum line coming off the motor and followed it to the firewall . I still can't get air to any vents . Anything else I can check?
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A-RIGS , MAKING BAD FISHERMAN LOOK GOOD SINCE 2010

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#10875940 - 05/27/15 02:25 PM Re: a/c only blows on defrost [Re: Brad Hardt]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6169
Loc: texas
I believe they have a blender door that is a common problem to get stuck. May google that, I bet its your problem.

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#10876962 - 05/27/15 08:33 PM Re: a/c only blows on defrost [Re: Brad Hardt]
Yellowcat Offline
TFF Celebrity

Registered: 06/11/06
Posts: 9793
Loc: Zabcikville Texas
If you are sure there are no more vacuum leaks then i would suspect a broken door in the dash. Dodges are notorious for broken doors because they are all plastic.

There is a guy from around austin that makes and sells doors that will NOT EVER break. They are called heater treater. The doors are all metal so there is nothing to break. I have installed several of them in dodges throught the last couple of years. You can replace the doors without pulling the dash but i prefer to pull the dash because its not a hard job being as i have done probably 8-10 of them. Not pulling the dash requires cutting the plenum and taping it back up.

If you need any more help pm me and i will do my best
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Justin
63lb, 2 58lb, several 40's, 38lb, and several 20lb yellas.



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#10878115 - 05/28/15 10:34 AM Re: a/c only blows on defrost [Re: Brad Hardt]
TITANIUM-BACK Offline
Pro Angler

Registered: 09/03/12
Posts: 811
Loc: Lake Lavon,Tx.
I work on allot of diesels,autos,machinery at my house. But the Dodge like you have I have also. The vacuum line that comes off the air pump make sure the elbow isn't cracked. No air to the vents is because you have no vacuum pressure to the box or your selector knob and it defaults to the defrosters. When you turn the selector knob do you here anything like a slight air noise. You can remove the the controller from the dash to make sure the tubes running to it hasn't split or broke off from it. I have seen that happen to.
_________________________
Freedom isn't free, you don't have to love it or leave it,but respect the price paid for it.
Master Caterpillar Field Mechanic. “Retired”
2 minimally invasive spine surgerys L-3 threw S-1
3 360 3 level spinal fusions with all Titanium Hardware.
2 Spinal cord Stimulator surgerys with dual motor implants.

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#10880710 - 05/29/15 11:04 AM Re: a/c only blows on defrost [Re: Brad Hardt]
Brad Hardt Offline
TFF Team Angler

Registered: 03/16/10
Posts: 3615
Loc: Argyle
I don't hear a noise , but it did happen gradually . It would happen from time to time now it's everytime I turn on the air
_________________________
A-RIGS , MAKING BAD FISHERMAN LOOK GOOD SINCE 2010

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#10888144 - 06/01/15 04:23 PM Re: a/c only blows on defrost [Re: Brad Hardt]
Nathan "Bull" Montgomery Offline
TFF Celebrity

Registered: 02/23/11
Posts: 5725
Loc: Fort Worth, Tx.
I had a similar problem on my Ranger. A/c would only blow out of dash. Replaced every freaking bad vacuum line I could find with no change. Finally got one of the guys to hook up the smoke machine to it and lo and behold the damn heater control valve was busted causing my vacuum leak! So if it has a vacuum controlled heater control valve you might check it. Mine wasnt leaking coolant but it was leaking vacuum.

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