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Search Auto Parts Search Air conditioner Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum RWESS New User Jun 5, 2005, 7:29 PM Post #1 of 4 (3364 views) Air conditioner Sign In This is my first visit to this forum! I am an ASE certified heavy duty truck mechanic with a question about my A/C Clutch that won't engage at all on my 1991 GMC Siera 2500 2WD. There is an A/C icon that flashes on the heater display about ten or fifteen times then it stops flashing until I push the A/C button again. The last time it did this it seems like all I needed to do was add refrigerant. The system has pressure in it, about 80 or 90 psi. I suspect a the low pressure switch on the accumulator may have failed but I am not too familiar with the circuit for the clutch on this model. I need help through this or advice on where to get diagnostic help. I looked at the fuse for the A/C and it was OK, other than that I have not tested a thing. The flashing A/C light has me concerned that there may be some extra built in diagnostics. Thanks for your attention and replies, RWESS Tom Greenleaf Ultimate Carjunky / Moderator Jun 6, 2005, 4:04 AM Post #2 of 4 (3359 views) Re: Air conditioner Sign In Check for power (voltage) at the low pressure switch. It will cut out at about 25 psig. It can be jumped (just unplug and use wire or what ever and compressor should engage) and take pressures, which are totally temperature dependant. If it's low on refrigerant more than a couple times you need to add oil! - and if too often need to fix the leak. Could use some more info here. Is this still R-12 or 134a? Do you have gauges? Hit back and we can fix this. Can buy gauges for $100 bucks or less and adaptors that will allow use on both R-12 or 134a - I don't deal with alternatives, Good luck - we are here to help, RWESS New User Jun 6, 2005, 10:32 AM Post #3 of 4 (3354 views) Re: Air conditioner Sign In  I own a White Industries 134A machine, I bought it used from the trucking company that was closing up in 1999. It is never too hard to find some one that has a broken air conditioner and we have some farm machinery that I converted to 134A too. The system on the GMC was converted to 134A about 1999 and had worked pretty well but since I didn't relace all the hoses it will loose some charge over the course of a season. I was a little confused by the flashing light in the heater control area of the dash and kind of was in a hurry and not thinking that there ought to be enough charge in the system since the gauges read about 80 or 90 when I hooked the machine up. I will work my way through the circuit using my frail memory. There are some recent class 8 truck systems that have diagnostic circuits built in and I wanted to see if you or some one else knew if this truck had something like that. Thanks again for the reply. PS I share your disdain for the drop in replacements. Some of them are butane or propane based. Extremely dangerous when under pressure, in a collision or to an unsuspecting technician. Tom Greenleaf Ultimate Carjunky / Moderator Jun 6, 2005, 3:02 PM Post #4 of 4 (3347 views) Re: Air conditioner Sign In Cool trick - go to a chain store and get a thermometer with the wired remote ( about 10 bucks or less) --they are fast and accurate -- can get output temps and ambient with the silly thing. It's far more handy than the meat thermometer type and faster. Great tool for adjusting A/C refrigerant. To be done carefully - over charge is NOT a good thing,   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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