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On my 1992 Plymouth Sundance 2.5 engine when I turn the air conditioner going down the road on it only blows out to defrost vent when I slow down let off the gas in blows out the ac vents

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  • 164 Answers

Possible a vacuum line is loose, pulled off below the dash going to the HEATER control system.

Posted on Apr 23, 2015

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6ya6ya
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Posted on Jan 02, 2017

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

VWdan
  • 114 Answers

SOURCE: ac will not blow thru ac vents, only thru defrost vents.

if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system

Posted on May 04, 2009

harley9701ha
  • 424 Answers

SOURCE: 03 LINCOLN NAVIGATOR AC WONT BLOW OUT PANAL VENTS

Check for a vacuum leak. First check the heater control valve to see if gray vacuum hose came off.

Posted on Jul 22, 2009

freetek
  • 5568 Answers

SOURCE: Cold Air Not Blowing Through Vents

Your last guess is probably the right one. The deflectors/directors are vacuum controlled and you may have vacuum line either broken or disconnected; these aren't fun to find. I would start under the hood and make sure the vacuum reservoir is intact (have seen them cracked) and then start tracing hoses from there.

Posted on Aug 18, 2009

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  • 3 Answers

SOURCE: Heat wont blow through heater or defroster vents

Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.

Posted on Dec 07, 2011

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1 Answer

Why going down the road to see air conditioner blow out of the defrost vents on the windshield on a 1992 Plymouth Sundance 2.5 engine


Vacuum line to the heater controll box has a leak or is disconnected.

Or the controlls went bad.

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What operates the doors for the air conditioner and heater controls in a 1992 Plymouth Sundance 2.5 engine


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WATER PUMP LEAKING


front of the engine see picture below.

2da1ac1.jpg

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1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

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