Want to tell aftermarket fans to turn "OFF" at highway speed with A/C "ON".
03-09-2008, 05:34 PM
#1
Want to tell aftermarket fans to turn "OFF" at highway speed with A/C "ON". Installed aftermarket fans using two relays. One relay is thermostat controlled and the other relay is controlled by the coil circuit of the A/C compressor relay. I want to tell the A/C fan relay to deenergize when the A/C is "ON" at highway speeds unless the water temp goes over my set point in which case the thermostat controlled relay would override. I don't really know how much good it would do to turn the fans "ON" over 50MPH. Is there a pinout on the PCM I can use that triggers around 50MPH or when I'm in top gear or overdrive?
03-09-2008, 06:00 PM
#2
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I believe you need to keep the fans on when the AC is running to keep the condenser temps down. If the temp gets to high the AC pump will shut down because of to much PSI in the lines. Las t time I did try that on my old 3rd gen it blew out the safety relieve valve the the compressor.
