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2001 Mitsubishi Montero Sport, ac not working properly. blowing hot air. AC seems to be engaged. RPM do increase when AC button pressed. AC unit seems to be working. belt is spinning it.
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The accumulator a long cylinder depending on the car may be located close to the fire wall under the
hood or close to your condensor. it will have a pressure switch, called a low pressure switch senses
freon pressure in the accumulator, if it is not getting voltage to it or there is a leak on its seal, it will open
up and will not let voltage go to the clutch on your ac compressor. you can pull off the switch, turn on your ac on high, get a paper clip or jumper wire, and jump the molex if your compressor comes on and
your car starts to cool,check the switch it may not be seated all the way, its a normally closed switch,
if you read across the switch with an ohm meter you should get a closed loop,when the ac is turned off,
you can remove it to test it without pulling the freon. if its open the clutch will not work, also check the
molex with a test light while it is on the switch,with ac on if it shows voltage on and off you could have
a bad wire. good luck!
If the noise started after you added the Freon, then it perhaps is your AC clutch. Normally if you have an automatic AC system, then when the Freon gets low, the auto system will not allow the AC to engage, only allowing the fan to circulate outside air. In order to add Freon to the system, the AC lock out has to be over ridden, in order for the compressor to **** in the Freon. This in turn engages the AC system so that the clutch engages, thus engages your AC system. The clutch bearings may be at fault.
My 2001 limited did the same thing. I bought a refridgerant refill kit from Walmart and plugged it in, but it showed that the level of refridgerant was fine. Turns out the AC belt had come off. I found it laying in the skid plate. My auto shop charged me $25 for a new belt and putting it on.
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