Air Conditioning problems
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New User
Joined: Aug 2003
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From: Holloman AFB
Air Conditioning problems
alright, im on the right track just need a little help. My AC is blowing hot air. the compressor clutch wont engage. I checked the low pressure switch and it IS good. i put 12V to the compressor and it worked so i know its an electrical problem, however i checked all the fuses and they're all good. the harness that plugs into the compressor has no voltage EVER. any ideas? thanks
Hotshot
Joined: May 2004
Posts: 12,170
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From: The hills of No. Calif.
When you say you put 12V to the comp. clutch and it worked, do you mean the clutch engaged, or do you mean the clutch engaged AND the A/C blew cold? My mom has an '88 Taurus, I was getting power at the press. switch but none to the compressor clutch. It's routed through the PCM so that it knows when the A/C is on and it can adjust the idle speed, etc. accordingly. I don't know what caused the problem, but I ran the power direct from the pressure switch to the compressor, she just has to remember to turn the A/C off before she starts it or it sometimes dies. Might be the same for you. -TD
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
OK, if the clutch is engaged but you are blowing hot air, then most likely your refrigerant charge is low. The pressure switch will keep the clutch from engaging when the the pressure is too low or too high. If the charge is low, no cooling! Have it checked, or buy a simple gauge at and auto parts store, and check the low side pressure. With the compressor clutch jumpered, you want to see 25 psi min. at idle with R-134A. And if it's low, don't run it for too long with it jumpered, because your not carrying much lubricant through the system, and you don't want to risk toasting the compressor. (And to answer the above, the computer will cut out the A/C during WOT to reduce the drag on the engine for passing power)
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From: Rosebud
I agree with Dan, if you jumped the compressor and get no cold air,it needs a charge,you could get a coolant installer hose and a can of freon and hook it up then jump the compressor for a few seconds and see if it takes the freon. your switch may check good,but without a charge it won't turn on the comrpessor.the coolant adaptor is only $6-8.
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Joined: Aug 2003
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From: Holloman AFB
would it be safe to say that, if i quickly pushed in the shrader valve that the low pressure switch is on and nothing came out--i am out of refrigerant? I am thinking that there is a broken line somewhere due to the fact that the day before the ac quit working it was cold as ice.
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Joined: Aug 2003
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From: Holloman AFB
i just pushed in the shrader valve and some green stuff shot out at me and some air came out. also i jumped the low pressure switch (bypassed the switch) and the compressor kicked in. everything is pointing to the refrigerant, but i'm still skeptical due to the sudden stopping of it working. oh yeah, and when i bypassed the switch it was still blowing hot air. assuming that the refrigerant is all gone--would i be able to recharge the whole system myself? how many bottles would it take, how much would it cost, and how would i do it? thanks
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Joined: Feb 2004
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From: Rosebud
Its easy, get a freon can adapter.$8. its just a valve and hose that hooks the freon can to the low side shrader valve.hook the can up and turn the valve with the truck running and if the compressor dosn't kick on,jump it for a minute and see if it takes the freon.hold the can upright and shake it a little while installing.if the freon is going in the system properly,the can will get cold in your hand.134A is only about $6 a can.off hand I would say to get at least 3 cans.Put one in and see if it gets cold,then put another,then another until it get as cold as you want.My 95 model with 2.3L is blowing 39 degrees out the front vent(checked with digital thermomitor).
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Joined: Aug 2004
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From: Mason Wi.
Ac
Having Similar Problems....did everything like you all did...but mine still blows Hot.. and I got the can that has the little pressure gauge on the side...it kicked on @ about 45psi...but I think that my AC Compressor is shot..cause it doesnt stay on for very long..