Air conditioner stops cooling and then works again -

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post #1 of 8 Old 04-05-2007, 08:21 PM Thread Starter
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Air conditioner stops cooling and then works again

Warm weather is coming soon so I will have to deal with a problem that I have put off since last year. The air conditioner in my 2000 Cherokee works great for a while and then all of a sudden quits cooling. It blows humid outside air for about 5 minutes and then begins to cool again. Any ideas?

A friend suggested that there is a temperature switch that keeps the condensor from freezing. But I have no idea what to look for or if that is true.

Thanks for the help!

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post #2 of 8 Old 04-05-2007, 10:36 PM
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First thing to check is the R134 level. See if it needs topped off or if there is a leak.

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post #3 of 8 Old 04-07-2007, 12:20 PM Thread Starter
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If the refrigerant was low then wouldn't it perform poorly consistently? This is an intermittent problem. The AC cools great when it's on. It just switches off completely from time to time.
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post #4 of 8 Old 04-07-2007, 01:17 PM
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My '99 did this last year - it needed freon but still did it after it was added. It mainly does it in stop and go traffic and has done it this year also.

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post #5 of 8 Old 04-07-2007, 05:28 PM Thread Starter
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Ya, it does occur more often driving at slow speeds which suggests it is related to temperature and/or pressure in the AC system. It really shouldn't be that hard to figure out for someone that is familiar with AC systems. I guess I'll need to start reading up and learn something new.

Last edited by QwkTrip; 04-07-2007 at 05:46 PM.
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post #6 of 8 Old 04-07-2007, 07:26 PM
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ok, if the r134a level is good, then next cause of this symptom is exapanison valve freezeup. happens when there is excess moisture in the refrigerant and it causes the water to freeze up where the liquid freon goes through a tiny orifice and expands to a gas in your evaporator (and gives frosty cool air)

you can't fix this's why:

search for a coupon, then go to pep boys, goodyear, or whoever, and have them suck all the refrigerant out, change out the dessicant/dryer assembly, then recharge it with 134a and the right oil. that will fix your problem...but you have to get out all the moisture with a vaccum pump for quite some time.

for around $100, you should have working a/c again.

OR: go to pep boys, napa, kragen, look for the little a/c bottles that can fix these little need the can that will claim to get rid of excess moisture in the system. they sell them for around $10 and might be worth a try first. the stop leak has worked well for me.

let us know what you decide.

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post #7 of 8 Old 04-08-2007, 12:32 AM
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coolent level
excess moisture in the system
poor connection on the compressor's power line.

those are your likely causes.

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post #8 of 8 Old 04-08-2007, 06:18 AM
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Mine was doing that 4 summers ago. It would work 20-30 minutes then I would have to shut it off for ten. Repeat.

My Jeep still had an extended warranty so my buddy at the dealer got to fix it for me. Something was freezing, whether it was what was mentioned above I couldn't say.

He did repair it and the problem hasn't existed since then. It sure was a PITA when driving from Chicago to Wash. DC.

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