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Search Auto Parts Search ac cycles on and off and makes battery light come on in between Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum jmuscarella New User Apr 4, 2014, 10:59 AM Post #1 of 6 (1755 views) ac cycles on and off and makes battery light come on in between Sign In I have a 1996 Isuzu Rodeo with 4cyl engine. Last June low side was in negative, so I replaced expansion valve. worked fine until recently. Now compressor cycles on and off and draws down power in car as it does so. Fan shuts off and battery light goes on and off as it does this. When it is running low side is around 80 and high side 125 with temp outside being 76. It did run for a few minutes today and air was ice cold. I watched a video that suggested valve stuck open but it didn't mention if it should be cycling on and off and using all power in vehicle as it does. Would appreciate any help Thanks Hammer Time Ultimate Carjunky / Moderator Apr 4, 2014, 11:41 AM Post #2 of 6 (1742 views) Re: ac cycles on and off and makes battery light come on in between Sign In With those pressure readings, your compressor is junk. You may also have some more electrical issues with the otrher stuff you are describing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. jmuscarella New User Apr 4, 2014, 12:33 PM Post #3 of 6 (1737 views) Re: ac cycles on and off and makes battery light come on in between Sign In Elecrical shop says belt may be slipping for just a second while demand is on alternator. I have had issues with this so it makes sense. Alternator is brand new and I had to have belt tightened twice to get it to not slip. It now does fine until I turn on a/c. It the expansion valve was stuck open like in the video I watched, would it cycle on and off ? The pressures he showed were exactly like mine with that being the problem bu he didn't say if it would just stay engaged or cut off. jmuscarella New User Apr 4, 2014, 12:49 PM Post #4 of 6 (1732 views) Re: ac cycles on and off and makes battery light come on in between Sign In I just went out and checked it. When the compressor kicks on everything stops briefly including the main pully. Is the compressor seizing? Hammer Time Ultimate Carjunky / Moderator Apr 4, 2014, 12:53 PM Post #5 of 6 (1730 views) Re: ac cycles on and off and makes battery light come on in between Sign In Get your belt problems straightened out before you try to diagnose the AC. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Discretesignals Ultimate Carjunky / Moderator Apr 4, 2014, 4:48 PM Post #6 of 6 (1721 views) Re: ac cycles on and off and makes battery light come on in between Sign In By main pulley do you mean crankshaft pulley? Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.   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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