1991 DODGE AC ISSUE

  • Tiny
  • Rixrep
  • 1991 Dodge

Air Conditioning problem
1991 Other Dodge Models V8 Two Wheel Drive Automatic 246, 00 miles

I have a 1991 Dodge Ram B150 with a 318. The AC works but does not blow out of the center vents, only the defrost and floor. I've already replaced the 6 button selector assem. What's next?

Thanks, Rick

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Thursday, July 17th, 2008 AT 1:48 PM

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  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

System is in default mode no vaccum is being applied.
So the door actuators are not working to route air.
First need to verify vaccum is getting to conroller. Then to the actuators. Look up past gas pedal see if you see round diaphram with vac line to it. Does it get vac in vent position? Also check pass side for same thing. If they get vac then R&R
Good luck

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Thursday, July 17th, 2008 AT 2:12 PM
  • Tiny
  • Rixrep
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I just checked and there is filter looking thing under the dash, it's about 3/4" by 3/4". I pulled the hose off of one end and there is light vacuum. Any suggestions?

Thanks, Rick

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Thursday, July 17th, 2008 AT 4:18 PM
  • Tiny
  • Docfixit
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Is there a lever attached to the other side where the hose is Does it move in dash vent mode? If not move it see if air comes from the dash. Vaccum should be strong like at the engine. Look for the line comming from engine to control be on pass side underhood.
Check pass side also

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Thursday, July 17th, 2008 AT 4:33 PM
  • Tiny
  • Rixrep
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By lever do mean the Cool ---- Hot lever in the control panel? If so, it moves and presses against the little white vacuum port thing on top of the 6 button control panel.

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Thursday, July 17th, 2008 AT 4:44 PM
  • Tiny
  • Docfixit
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O.K. That is where you need to see if good vaccum is now from there vac goes to the actuators they will be metal on the side where hose connects and rubber on the other side that is connected to the lever. Get in the floor look at the center consoule
to right of gass pedal and on pass sidetoward the center. The actuateor is about 4inc. In dia.

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Thursday, July 17th, 2008 AT 4:53 PM

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