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Old 08-07-2016, 09:43 PM
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Exclamation A/c problems!!

Hey guys so I'm having a weird problem that I have no idea how to diagnose and fix. First off, my Jeep is a 1997 2.5l 2 inch lift with 33's. So the issue is that my jeep runs great with the A/C off. No surges no shaking and no loss of power at high speeds. BUT when I turn my A/C on it start shaking pretty bad, surges sometimes to high RPM's or low RPM's, and as of late everytime I'm on the highway going above 55mph it loses power and starts to slow down and speed back up continuously. Everything is normal until the A/C comes on. Thanks i advanced for your help!

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Old 08-07-2016, 11:01 PM   #2
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Crankcase sensor can cause surging. IAC can cause surging. But can't see why the AC would have an effect on it. Might try cleaning the IAC and Throttle body. There's a good post on how to do it somewhere on this site.

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Old 08-08-2016, 12:50 AM
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Crankcase sensor can cause surging. IAC can cause surging. But can't see why the AC would have an effect on it. Might try cleaning the IAC and Throttle body. There's a good post on how to do it somewhere on this site.
Thanks! Will see if it works. Anyone else??
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Old 08-08-2016, 06:55 AM   #4
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I am guessing a short in the A/C circuit?
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Old 08-08-2016, 08:55 AM   #5
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The a/c clutch could be going wonky causing drag on the motor
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Old 08-08-2016, 08:58 AM
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The a/c clutch could be going wonky causing drag on the motor
A/c clutch. Ok. Will look into that too.
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Old 08-08-2016, 09:02 AM   #7
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Feed the squirrel, seriously the 2.5s don't have enough power to support the A/C on hilly roads. The drag of the A/C is causing the motor to struggle, make sure the motor is in top tune and have the A/C checked and serviced. You will always notice the drag of the A/C on a 2.5, time for that 5.3 conversion.
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Old 08-08-2016, 10:21 AM
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Feed the squirrel, seriously the 2.5s don't have enough power to support the A/C on hilly roads. The drag of the A/C is causing the motor to struggle, make sure the motor is in top tune and have the A/C checked and serviced. You will always notice the drag of the A/C on a 2.5, time for that 5.3 conversion.
As soon as a fire department will hire me and I have enough money that 5.3 is going in believe me!
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Old 08-08-2016, 12:01 PM
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Does anybody think it could be a vacuum leak in one of the a/c lines?
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Old 08-08-2016, 12:09 PM   #10
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Does anybody think it could be a vacuum leak in one of the a/c lines?
The vacuum is used for power brakes, Cruise control, and the A/C control unit to select where the air is coming out. Can't see that it could be the problem. The AC clutch is designed to turn on and off by itself, so when you check it...keep in mind that it cycles on its own and could be why you get the surge in power and depressed power as it cycles.

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