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Search Auto Parts Search Low pressure on AC - Low or no freon? Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum nwfixer Novice Apr 9, 2012, 9:41 AM Post #1 of 4 (4278 views)      Low pressure on AC - Low or no freon?   After doing some major work on my 1989 Dodge Raider (Mitsubishi Montero) the AC has stopped working - the compressor clutch will not engage. I traced it down to an open pressure sensor switch so it's probably either low refrigerant pressure or a complete loss of freon (although it's also possible the switch has gone bad). The truck's been in storage for 8 months and the AC was last charged 15 years ago so this may be simply the slow loss of pressure that happens over time with these systems. It's also possible that unbolting and moving the compressor caused a leak and all the R12 is gone. If this is simply a matter of recharging the system I can buy R12 from Ebay and do it myself but if there's no freon left I'll have to pay $$$ to have the leak fixed and then for conversion to R134. Since I am unable to get the compressor to run and can't use the view window to check the freon level does anyone have any idea how to tell if there's any R12 in the system? Do I need to purchase a gauge to do this and can a gauge be used without running the compressor? Hammer Time Ultimate Carjunky / Moderator Apr 9, 2012, 9:51 AM Post #2 of 4 (4270 views)      Re: Low pressure on AC - Low or no freon?   Why would you be looking at the electrical if you don't even know what the pressure is yet? That is your very first step. If you don't have professional gauges and an understanding of refrigerant, then you really should leave it alone and we'll close this thread. Read this http://autoforums.carjunky.com/Automotive_Repair_C1/Heating_or_AC_Issues_F8/BEFORE_USING_THIS_FORUM_FOR_A/C_PROBLEMS_P114495/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. nwfixer Novice Apr 9, 2012, 10:11 AM Post #3 of 4 (4264 views)      Re: Low pressure on AC - Low or no freon?   In Reply To Why would you be looking at the electrical if you don't even know what the pressure is yet? That is your very first step. If you don't have professional gauges and an understanding of refrigerant, then you really should leave it alone and we'll close this thread. Read this http://autoforums.carjunky.com/Automotive_Repair_C1/Heating_or_AC_Issues_F8/BEFORE_USING_THIS_FORUM_FOR_A/C_PROBLEMS_P114495/ ____________________________________________________ The compressor clutch would not energize, nor would the radiator cooling fan, thus it was an electrical problem that was traced to an open pressure switch. I would have no problem taking this somewhere to simply have the Freon recharged, but the shops I've called in the area no longer do R12 recharges so I'm stuck with trying to do this myself. I've recharged systems in the past with no problem, but that was when R12 was readily available. It's now about $100 to get EPA certified and buy a single can of R12 so I'd like to know if the system has any charge before taking that route. (This post was edited by nwfixer on Apr 9, 2012, 10:17 AM) Hammer Time Ultimate Carjunky / Moderator Apr 9, 2012, 11:23 AM Post #4 of 4 (4237 views)      Re: Low pressure on AC - Low or no freon?   As I said earlier, you should have checked pressure before electrical. You really don't know enough about A/C to be doing this. I'm going to close this thread now ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   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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