craigc

I do not know where to post this so I'm doing it here.

My ac does not work (needs recharged) but when I turn on the heater the ac compressor clutch kicks on and off like it would if the ac was on, and EVERY time it kicks on, my voltage drops and dims all my lights inside and out of the jeep (1991 2dr xj) I was just curious if it was supposed to do that or not, I'm thinking not, and also curious if there is a way to in hook the power to the ac compressor and if the pulley will still spin freely?

investinwaffles

Pull the low pressure sensor switch and your AC compressor should no longer kick on. At least that is the case in my 98 XJ.

craigc

and where might this sensor switch be located? lol

michaelo

You can look here:

http://rechargeac.com/ac-service-port-finder

craigc

the link only shows a 2011 , i think i found it though, just have to wait for night to see if it was it lol

michaelo

Of course you must enter YOUR car's specifications in the search windows...

craigc

I did but it was only coming up with a 2011, no need to worry about it though, I think I found it haven't had a voltage drop yet but not going to dismiss the issue just yet

michaelo

You must click on the link "CLICK TO ENTER PORT LOCATOR"

craigc

i got it, but that did not cure the problem, i think its in the wiring, i've already replaced the battery and alternator and un plugged that....hmmmmmm

CCKen

Are you saying you unplugged the AC Low Pressure Switch and the compressor still engages?

craigc

no, sorry wasnt clear on that, the compressor is off, but my voltage still drops when i use the lights an heater together BUT not as often or as bad as it did with the compressor plugged in.

nujeepguy

new batt, alt? might want to look at alt field connector.

EatonXJ

Do the big 3 upgrade or at least clean up all the connections. This kit is probably overkill but man I love their wire. http://www.sonicelectronix.com/item_...ee-Copper.html

Someone on here makes and sells kits also but I can't remember who it is.

Martlor13

Nah don't point them there haha. Xjwonders is who to go with.

investinwaffles

http://i519.photobucket.com/albums/u...VIVINGPORT.jpg





Have you cleaned or replaced the battery terminals? The stock ones are notorious for corroding internally.
You could pull the alternator off and have it tested at an auto parts store or alternator rebuild shop.

Clean ALL the major grounds, clean the terminals going to the alternator and starter. If you are 100% sure your alternator is good, then the wiring would be the most likely culprit to voltage drop. Second most likely would be either a bad pulley causing the belt to slip, or the belt slipping for other reasons (water pump bearings, power steering pulley, alternator bearing and/or brushes)

Start with cleaning all the terminals, electrical connections, and ground points (use sandpaper, emery cloth, or steel wool) and see where it leaves you.