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A/C stops working on the freeway

Old Nov 6, 2011 | 09:00 PM
  #16  
White Elephant's Avatar
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From: Placentia, CA
Year: 1999
Model: Cherokee
Engine: 4.0 L
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thanks guys

from all the stuff said it sounds like its a freezing problem, but who knows, ill check it out an post my results to help the rest of you w/ problems out
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Old Nov 6, 2011 | 09:29 PM
  #17  
rrich's Avatar
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From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
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Could be freezing - but it should do it at low speeds too. It may not at idle, but around town it should stop working too.

If it has the type of expansion valve with the copper tube and bulb, the bulb may not be placed right. it should go right into the evaporator coils where it can sense if it's getting too cold.
If it's been replaced it may not be in proper position to detect it's starting to freeze.

Refer to a service manual as to how it should be placed.
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Old Nov 7, 2011 | 11:39 PM
  #18  
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From: Southern Oregon
Year: 1995
Model: Cherokee
Engine: 4.0l
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I had a similiar problem caused by a vacuum leak, you might want to check a few of your check valves.
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Old Nov 8, 2011 | 10:37 AM
  #19  
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From: Eugene, Oregon
Year: 2000
Model: Cherokee
Engine: 4.0L
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My ac was cutting out or stopping on the highway when accelerating, cruise control was not working as well. Turned out the resevoir line was somehow off of the vaccuum resevoir under the pass. Headlight.
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Old Nov 8, 2011 | 01:27 PM
  #20  
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From: Charleston SC
Year: 2000
Model: Cherokee
Engine: 4.0L
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Originally Posted by Caish
The coil is electomagnetic, its either good or its bad, as long as your getting 12v to it.
This is not correct - the magnetic field produced by the voltage is also dependant on the resistance of the conductor - which increases with heat cycles and heat. So an old coil which has undergone many heat cycles, will produce a weakened magnetic field as it its temperature increases...and get to the point where that magnetic field is not sufficient to pull in the clutch.
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