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Search Auto Parts Search ac indacator light issue Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum dennishazard User Aug 2, 2019, 4:18 PM Post #1 of 4 (1172 views) ac indacator light issue Sign In 2007 chevy impala 3.5 engine 150,000 miles can any one tell what my problem could be ? when I turn on my a c the indicator light just blinks and then shuts off thank you Sidom Veteran / Moderator Aug 3, 2019, 8:36 AM Post #2 of 4 (1146 views) Re: ac indacator light issue Sign In I haven't seen that particular problem on a GM, I've seen a couple of Toyota's with bad clutches do that. A set of gauges and high end scan tool would be very helpful. I guarantee this is setting a code, if it isn't in the PCM it would definitely be in the HVAC module. Have you checked to see if you still have a charge in the a/c system? Tom Greenleaf Ultimate Carjunky / Moderator Aug 3, 2019, 8:44 AM Post #3 of 4 (1142 views) Re: ac indacator light issue Sign In I haven't seen that either Sidom. Another the LED quit but A/C kept working fine. I didn't fix that was push button type, light (diode?) on the button. IDK, I think those just pull out to replace I just didn't it worked fine and was obvious in or out position to owner, T Double J Veteran / Moderator Aug 3, 2019, 1:52 PM Post #4 of 4 (1129 views) Re: ac indacator light issue Sign In Per GM Bulletin # 07-01-38-003 Condition/Concern Some customers may comment that the Air Conditioning (A/C) indicator on the Heating Ventilation and Air Conditioning (HVAC) Control Module flashes then turns off after they press the A/C button. Others may comment that the Recirculation indicator on the HVAC Control Module flashes then turns off after they press the Recirculation button. This is normal operation for the HVAC Control Module and indicates that the A/C or Recirculation function is not available at this time. Reasons that the A/C may not be available (calibrated values vary by program) are listed below. Consult the appropriate vehicle Service Information (SI) for detailed HVAC Description and Operation: • Ambient Air Temperature is too low (if equipped with Ambient Air Temperature Sensor) • Vehicle voltage less than 9.5 volts • Refrigerant Pressure too low • Refrigerant Pressure too high • Engine Coolant Temperature too high • Engine is not in RUN • HVAC Control Head is in the OFF position Reasons Recirculation may not be available: Mode switch in Floor, Defog or Defrost mode. The reason(s) A/C is currently disabled can be viewed with a Tech 2® by navigating to HVAC Data display and viewing the "A/C Permission" parameter. Recommendation/Instructions Do not replace the HVAC Control Module for a flashing A/C Indicator or flashing Recirculation Indicator, as this is normal operation.   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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