billbranch Posted August 20, 2013 Report Share Posted August 20, 2013 My daughter is using a '91 405S. I installed a new used condenser and receiver drier in the spring. The system had held vacuum pretty well, and we charged the system and added an anti-leak product. We could not find the leak. It lasted through a brutal heat wave and then stopped. She said it made a funny noise. I checked it yesterday. The compressor clicks on when when turned on. No cold. I am thinking bad trinary switch and no charge. Any comments? Quote Link to comment Share on other sites More sharing options...
my3AWDgst Posted August 21, 2013 Report Share Posted August 21, 2013 Bill,make sure first when vehicle is running that A/C is on and that A/C compressor clutch stays engage. Quote Link to comment Share on other sites More sharing options...
my3AWDgst Posted August 21, 2013 Report Share Posted August 21, 2013 Also I did write up on my A/C problem on Yahoo group. Quote Link to comment Share on other sites More sharing options...
billbranch Posted August 21, 2013 Author Report Share Posted August 21, 2013 Hi, Savo, Yes, the car is running, and, yes, the clutch engages, but there's no cold. It appears the system safety (trinary switch) which turns the system off for low pressure, high pressure, or high temperature, is not working. The clutch does engage and disengage without reason. Sorry, the Yahoo group has outlived its usefulness for me. Quote Link to comment Share on other sites More sharing options...
my3AWDgst Posted August 21, 2013 Report Share Posted August 21, 2013 Not related to your problem but nice to know. http://www.505turbo.com/forum/index.php?/topic/2579-incorrect-ac-wiring-diagram-on-405/ Quote Link to comment Share on other sites More sharing options...
my3AWDgst Posted August 21, 2013 Report Share Posted August 21, 2013 Hi, Savo,Yes, the car is running, and, yes, the clutch engages, but there's no cold. It appears the system safety (trinary switch) which turns the system off for low pressure, high pressure, or high temperature, is not working. The clutch does engage and disengage without reason. Sorry, the Yahoo group has outlived its usefulness for me. If the clutch engages and disengages that indicates proper operation of trinary switch.Now if refrigiant is low compressor will cycle fast on and off.First thing I would check is to make sure that blend door(hot,cold) is not stuck in HOT possition.After that I would make sure for proper amount off refrigiant in A/C system. Quote Link to comment Share on other sites More sharing options...
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