Big Jim Posted July 8, 2012 Share Posted July 8, 2012 Is there a way to test the Thermal Limiter Switch on the AC Compressor? My compressor is not working and I'm getting power to the limiter. Quote Link to comment Share on other sites More sharing options...
FASTSS454 Posted July 8, 2012 Share Posted July 8, 2012 The three prong limiter? God that brings me back to the 70's when I would have 4-5 cars with gauges on em at a time. I worked for one of the very few gas stations that did A/C work at the time. You can check it with a ohm meter but I don't remember which 2 teminals had to have continuity now, sucks to get old but I bet if you look at the wiring you can figure it out. The switch itself would just supply a ground when overheated to blow the limiter. One wire from the switch, one wire from the A/C controls and the third wire ran to compressor clutch. Very simple system. Quote Link to comment Share on other sites More sharing options...
Big Jim Posted July 8, 2012 Author Share Posted July 8, 2012 The prongs are labeled S B C. Quote Link to comment Share on other sites More sharing options...
Big Jim Posted July 8, 2012 Author Share Posted July 8, 2012 Can anyone else tell me which prongs to test with the ohm meter? Quote Link to comment Share on other sites More sharing options...
Big Jim Posted July 8, 2012 Author Share Posted July 8, 2012 I get 13.4 between S-B, .3 between B-C and 16.6 between S-C. OHMS that is. Quote Link to comment Share on other sites More sharing options...
Toppless72 Posted July 15, 2012 Share Posted July 15, 2012 Jim, Here is what I'm getting on a brand new Republic therm sw. Craftsman VOM / Fluke VOM S-B 16.7 / 16.2 B-C .4 / .3 S-C 17.1 / 17.5 After 3 checks each. You may want to look at your S-B again. Quote Link to comment Share on other sites More sharing options...
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