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Message: [QUOTE="gnxtc2, post: 1227696, member: 1414"] I know the low pressure side is not low, so the compressor is not cycling. For the high pressure side, the switch is NO/NC. The NC side is connected to the truck harness as the original switch was NC. The NO side is connected to control side of the relay for the engine fan. I'm switching the negative of the relay coil. I know when the switch makes it causes the engine fan to kick on. What I don't understand is why the compressor clutch is still engaged when the engine fan kicks on? :confused::confused::confused: Bad diode? The low and high side switches are in series. I was driving the other day on the highway doing 70. The temp outside was 80*. The engine fan was engaged for 20 minutes. I know that I had air movement across the condenser. I feel like installing a manual switch in series with the NO side of the high pressure side so I can shut the fan off on the highway. Do you have any links the Kysor and Red Dot switches? Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]

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