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jeep hesitates to accelerate from stop when a/c running

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Jul 30, 2011, 2:31 PM

Post #1 of 5 (2172 views)
jeep hesitates to accelerate from stop when a/c running Sign In

Jeep Grand Cherokee Laredo
V6, 3.7L
89,000 miles

My Jeep Grand Cherokee hesitates to accelerate from the stopped position whenever the a/c is running. I first noticed the a/c taking longer to cool a few months ago, and then a month ago noticed that whenever accelerating from the stopped position that the jeep did not move until it hit about 1800 RPM (whenever the a/c is running). Whenever the the a/c is off, the jeep accelerates as soon as I push the pedal.

Things my mechanic has tried:
The mechanic gave the jeep a tune up, replacing air filters, spark plugs and wires, but to no avail. Shortly thereafter, the a/c failed to produce cool air. He recharged the a/c, and the a/c worked for a day, but stopped working the next morning. He then filled the system with dye, and could find no leaks. He then added extra dye and let me drive it to work and back, at which point he found a slightly leaking valve. He replaced this, and recharged the system and everything worked perfectly for a day (both a/c and hesitation gone). The next day, the hesitation reappeared, and on the 2nd day, the a/c failed to produce cool air. No warning lights come on to indicate a problem. My mechanic seems stumped. If anyone knows what the problem might be, then I would greatly appreciate their suggestions.

possibly extraneous information:
If I turn the a/c off, the jeep still continues to hesitate until after I shut it off. On the first restart after this, the jeep sometimes still has this acceleration problem, but sometimes does not. On the second restart after turning the a/c off, the jeep then accelerates correctly. Again, any help would be greatly appreciated. Thanks in advance.

Ultimate Carjunky / Moderator
Discretesignals profile image

Jul 31, 2011, 6:56 PM

Post #2 of 5 (2150 views)
Re: jeep hesitates to accelerate from stop when a/c running [In reply to] Sign In

Did your mechanic scan all the modules in the vehicle for trouble codes?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jul 31, 2011, 6:58 PM)

New User

Jul 31, 2011, 9:13 PM

Post #3 of 5 (2140 views)
Re: jeep hesitates to accelerate from stop when a/c running [In reply to] Sign In

Not to my knowledge (they did not mention scanning for any codes, but did mention that it is difficult for them to diagnose the problem if no warning lights actuate). I am not sure if they have that technology or not, given that the place I have been going to is fairly small, and located in a small town. I will check with them about this tomorrow. Thank you kindly for the suggestion.

Veteran / Moderator
Sidom profile image

Aug 1, 2011, 8:56 PM

Post #4 of 5 (2125 views)
Re: jeep hesitates to accelerate from stop when a/c running [In reply to] Sign In

Definitely a strange problem. I have to say I haven't seen that one yet......

The only pattern I can pull out of this which really shouldn't have anything to do with it but the problem only seems to surface when the a/c system gets low. If was empty in 2 days then it was low the next day and that's a big leak...

Some of the older Chrys had a problem with the evaporators leaking.... If they aren't picking up any leaks under the hood the evap should be looked at closely....

Having the right tools is important but you can't judge a shop by the size of the shop or town.....There are some very good small shops out there and unfortunately there are also some not so good ones.....


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 3, 2011, 7:39 AM

Post #5 of 5 (2110 views)
Re: jeep hesitates to accelerate from stop when a/c running [In reply to] Sign In

Ditto w DS: Famous for evaporator leaks and an electronic detector would about prove it without seeing it. A two day leak down of charge should be easy to find. Your mechanic should be looking for dye now in condensate drain or electronic sniff out evaporator thru the interior vents.

Just FYI, oils in system to lube compressor move with a proper charge and some won't lube compressor if it can (the should be designed to shut right down but not all do) and may keep trying and be a huge drag on the engine. If so throw that in and probably a condenser along with other parts - big and expensive if this is it.

Guess is when it was charged and freed up it got some oil for a while??

Long retired now

jeep hesitates to accelerate from stop when a/c running

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