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AC mystery in 2002 Jeep Liberty

Our air conditioning either works perfectly, or not at all. The fan runs fine, but as we’re driving along the AC will suddenly stop cooling and later, just as suddenly, start cooling again.

We had it checked out at a Jiffy Lube, who diagnosed the problem as too much freon, and later at the dealer, who couldn’t find any problem at all.


Well First I suggest two things

First, n Keep away from the quick change places. We hear far too many horror stories about them. Some may be fine, but many pay the help little, demand fast changes and that results in a high percentage of errors. Too many live by selling you something you don’t need at inflated prices.

Find a good local mechanic and stick with them for your needs.

Don't go to the quick lube places, even for directions.

Second Dealers are no better (or worse) than independent mechanics for almost anything you might need done on your car. They will almost always charge more per hour and often more for parts and supplies. They also tend to look at repairs a little different than the independent.

A dealer may well recommend work that strictly may not be needed, but could be connected to the problem or maybe replace a part when a little repair would fix it ALMOST as good a new.  

I suggest you find a real A/C shop, not one that does a little on the side.  Generally if you are in the snow belt, you will need to look for a radiator shop/AC shop. They are going to be cheaper and better in the long run. (remember, no chain shops)

Yeah, we only went to the quick-change place because we were out of town at a wedding and had a few spare hours – and it was hot!
I understand your feelings about the dealer, but my mechanic retired a couple years back, and I didn’t like the shop he referred me to. So inertia won out, I guess.

Take it to a shop that specializes in AC.

My wild guess is that the device that controls the release of the refridgerant from the high pressure side into the evaporator (it’ll either be a specific orafice tube or a pressure release valve setup) is malfunctioning intermittantly in some manner.

But I’m not an AC specialist. I’m just wildly guessing.

Thanks for your suggestions.
I wonder if they can check that if the AC is actually working at the time I take the jeep in?

I honestly don’t know. Not being an AC guy I have np idea what their capbilities for test are.

Can anyone here help?