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Originally Posted by buck moberly
could the low pressure switch also called a cycling switch...
i just lost my shift key and gained 2 pounds of r-12 and a working a/c system, except for a cycling switch...question..
the shop were i had the system charged at suggested that i install a new cycling swith, they wanted one hundred dollars for it ... is it a low pressure sitch..
i've got to get that shift key working, it's hard to ask questions without that mark.
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Some cars have a pressure switch in the low side, which is a cycling switch. Its job is to turn the compressor off when the low side has sufficiently low pressure.
Your car is not among them. There is no cycling switch in your system. The low-pressure switch is on the high side, and prevents the compressor from starting in the first place if you're low on refridgerant, but it won't cut it off once it starts.
The switch that they want to install is a high side cutout switch which turns off the compressor if the high side gets too high, and is required for HFC134a conversions, but not required for R12, and shouldn't be needed.