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If you are referring to the switch on the top of the accumulator (firewall on passenger side), that is the a/c low pressure switch. It prevents the a/c compressor from engaging (through the PCM) if the pressure in the system is too low. It should have two wires, a black one that goes to ground, and a brown one that goes to pin 22 of connector 3 on the PCM.
could be switch and also could be low coolant in AC unit. Will not kick on if coolant gets to low....Check fuses first ....could very well be blown fuse....hope this helps and good luck....Please rate my post
Hi Gunny, have the gas pressure checked first. If the pressure is low the electro clutch for the compressor will not engage. The system is protected with inhibitor pressure switches mounted into the high pressure line. Regards John
I have a 92 Dakota with a 5.2 (318) 4x4, automatic trans. You can simply remove the ac compressor and go with a belt a bit longer then what stock non AC calls for. The idler pulley is in a slightly different location from AC to no AC engines so just getting the non AC belt won't work. I used a 5070900 / 7PK2285 for mine and it worked fine. Just a touch tight getting on. Next time I'll probably go 1/2 inch longer so a 5070905. I'm a licensed tech with 20 years in the trade in Canada, 4 years of that with a Dodge dealer.
I will assume that the a/c system has been changed over from R-12 to
R-134, if not, it needs to be done before going any further.
That said the low side service port is located on the compressor head or
on the suction line from the comp. head. With the R-134 system installed correctly the charge line will only fit the low side as the hi side
has a larger fitting. Hope this helps.
Check the high side ac clutch cut out switch,witch could be in back of compressor,or in a high side line.By pass the switch to see if the compressor will come on.Also the ac module could be gone out.First check the ac clutch relay,or better yet swap it out with a relay just like it,same number will be on the relay,this will tell you if it is the relay.
start at ac pump and follow the lines/hoses off the compressor the large line is the low side with a small service port the high side srvice port is on the small line/hose it is the large port(and they could be on the compressor
there are 2 ports one for low pressure and one for high pressure. the low pressure is bigger in diameter and is usually close to the dryer and or fender and firewall. the high pressure is near the condensor on the fron of the vehicle. if there are caps for the ports low will be blue and high will be red. low side pressure should be 35-50 psi and high pressure should be 135-150 psi