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Max a/c or heat only comes out defrost and lowers volts

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Old May 13, 2018 | 09:33 PM
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Ktrain's Avatar
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Default Max a/c or heat only comes out defrost and lowers volts

Hi I have a 91 jeep xj 4.0 L when I turn on my mac a/c or heat it only comes out the defrost vent but when I change it to vents it comes out. Any ideas? Also when I turn on my climate control my bolts drop a lot, about half of what they normally are.
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Old May 14, 2018 | 07:15 AM
  #2  
cruiser54's Avatar
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From: Prescott, Az
Year: 1990
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Originally Posted by Ktrain
Hi I have a 91 jeep xj 4.0 L when I turn on my mac a/c or heat it only comes out the defrost vent but when I change it to vents it comes out. Any ideas? Also when I turn on my climate control my bolts drop a lot, about half of what they normally are.
Yes. There is a problem with vacuum in this system regarding the vents.

As for the volts, you may have a weak alternator, need to service your battery cables, refresh ground points in the engine bay.
Attached Thumbnails Max a/c or heat only comes out defrost and lowers volts-vac-ball-routing.jpg  
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