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Old 06-02-2002, 06:43 PM
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Paco Paco is offline
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Post A/C question

I have a trinary switch installed on my '40 Buick A/C system to switch on the electric fans when ever the A/C is turned on. It also has a thermostat in the radiator which will turn on the fans at 200 degrees F and a manual fan switch so I can turn them on as needed. If I remember, the trinary switch on the A/C system is designed to make the fans come on when the head pressure comes up on the unit. I noticed today that my fans would not come on, even after running the A/C for some time, unless the temp got to 200 degrees (which would make the fans come on from the thermostat in the radiator, no the trinary switch). My A/C unit seemed not to be cooling quite as well as usual, and I am wondering if these may be signs of low freon in my system. Would low freon in the system make the head pressure stay low and not turn on the fans thru the trinary switch? Any A/C folks out there that understand my system as described that may be able to shed a little light? thanks.....PACO
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