Katzer Posted March 27, 2015 Share Posted March 27, 2015 I am trying to get my AC up and running. It is a cobbled together nightmare. I do not have an AC thermostat under the dash so I am going to order one. I have tracked down the wiring that plugs into it, but I have no idea where to route the temp. sensing end of the switch or where it is supposed to go. Any help would be greatly appreciated. I also do not have a low pressure switch. It isn't wired for one and the drier doesn't have a switch in it at all. Suggestions on this. Should I try and install one? The drier has a small plug where I think the switch should go. Link to comment Share on other sites More sharing options...
87MJTIM Posted March 27, 2015 Share Posted March 27, 2015 What year is your MJ? Which engine? Did it come with factory AC or was it dealer installed? Inquiring Minds Want to Know. Link to comment Share on other sites More sharing options...
Katzer Posted March 27, 2015 Author Share Posted March 27, 2015 It is an 89 2.5L. Not sure how to tell if it is dealer installed, but after chasing wires and reading diagrams I am guessing it is a very poorly cobbled aftermarket installation. It doesn't have a low pressure switch and after chasing wires I don't think it was wired for one from the factory. I also don't think it was wired for the AC thermostat from the factory. The PO had the compressor hot wired directly from the AC control switch on the dash and through the firewall. I am trying to fix it the right way. I have figured out how it should be wired but just not sure how to route the temp sensor for it or even where it goes. Thanks for reading. Link to comment Share on other sites More sharing options...
Comanchemodder Posted April 1, 2015 Share Posted April 1, 2015 I am in the same boat, but I think I am further down the creek... 1) Dealer installed A/C vs factory AC: The heater box which contains the evaporator is smaller on the dealer installed trucks. I swapped my heater box out with a factory AC cherokee. 2) My dealer installed A/C had a bird's nest vacuum logic circuit under the dash on the passenger side. Best I could tell is the logic circuit is used to turn the blower fan on when the AC goes on and/or the defrost. But I didtn't try to figure it out. I by passed it and currently have my blower fan working correctly. 3) Next step for me is to add in an A/C on-switch in the dash. Download and learn the electrical manual. It is all in there. I just need to get some time to get it done. Link to comment Share on other sites More sharing options...
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