Question about 2002 Mitsubishi Montero Sport

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Why does my A/c compressor have a slight squeak and spins intermittely? Do I have to replace the compressor

Sometimes the a/c works fine for a little while and sometimes it spins intermittently and will not produce cold air. I've added a little refrigerant but nothing has changed and the pressure gauge is still in the red zone? Can I fix this problem without replacing the compressor

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Is it belt driven ? check the condition/tightness etc of the belt

Posted on May 15, 2014

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Red meaning too high or too low? ( assume you are only reading the low/suction side?)

Too low means it is either undercharged or there is moisture in the system. Intermittency would lead me to suspect the latter. What happens is the moisture freezes while the system is getting cold, clogging the expansion valve. Once clogged it doesn't get cold anymore, the clog thaws and the cycle repeats. The correct way to fix moisture contamination is to evacuate the system and replace the charge. You can sometimes get away with dumping the charge, replacing the drier, purging and then recharging, but it's an expensive gamble, and it's not very eco-friendly.

Too high means it is either a failed thermostatic expansion valve, overcharge or bad compressor. In the first 2 cases you'll typically see some icing of the suction line at the compressor. (It's easier to troubleshoot when reading both the high and low sides.)

Posted on May 15, 2014


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SOURCE: 2000 Mitsubishi Spyder ac replay intermittent trouble

two things you may try, relocate ambient sensor to colder place, remove it from front bumper, and connect the two wires on refregerant temp sensor located @ rear of compressor, be carefull and observe your a/c system after doing this

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SOURCE: My AC is blowing cold


I read your situation, and this kind of happened to me, which is similar which is what your going through. Let me explain and maybe this will help. I have myself a 1993 BMW, My ac was blowing real weak and blowing only out warm air, so of course i first checked the compressor, and it was triggering on, and checked my high speed fan, ( that is the fan that goes into high gear based on thermostat based on heat of motor) all this seemed to be fine, so i went down to mechanical shop, and for them to check my ac system was 85 bucks, and we would go from there, if needs just a charge, or something else wrong, then price would certainly go up. So, what i did to save some money and take a chance, was I went down to AUTO ZONE, and bought the freon kit that comes with pressure guage and, then went home and hooked up, followed instructions completely, (you know, weather temp, where to turn dial, can at 2 o'clock position, and shake every few minutes) Now, after I did this, it was cooler and did make a difference, but it was like yours certain rpms, better and real intermittently working. Now, I realize your car is different then mine, but same symptoms and here is what I did to fix it, and it works great today....

Fist make sure your fans are operating proper, at high temperature they should kick on higher speed which of course keeps engine cooler as needed. Make sure that compressor of course is coming on as needed, by hearing it kick on, it will of course lower rpms some, assuming all that is working proper, here is what i did and i will explain why.

My car, after charging it, and it was real low when i started, i believe got a vapor lock in it, meaning, when i got all done, it seemed to be charged and full and all that, but just didn't work good enough, so i drove it a couple days with ac on high, maxed out, and then bought another can an recharged it again, and shazam!! it took more, and apparently got the partial air bubble, vapor lock out, and now ac works good, and blows cold with no intermittent symptoms.

Bottom line to this story, is if you are sure other items are working proper, it might be recharge it again, and next step to see if there is a air leak in line, that would cause this as allows air to get in and cause vapor lock. A service center can put whole system under pressure to see if there is a leak somewhere, if recharging it does not solve the problem. Thanks Mike no punt intended, but be Cool!!

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SOURCE: 2004 mitsubishi endeavor fan blower works intermittently

It sounds like your blower thermostat is working intermittently.

Posted on Mar 14, 2013

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