Refrigerant Type: r-134a
I was wondering if there was any kind of switch available to put on the high side to turn on an relay for a electric fan when pressures got over 200 or so psi?
What kind of vehicle? Do the vent temps get warmer at slow/idle speeds? You have to give us more info.
Its a 2003 gmc sierra, I put electric fans on it and didn't want to use the compressor clutch to turn them on because then they would run going down the road when they didn't need to. Something that would attach to the high fitting would be great but I could also splice in high side line.
As designed that system will work properly if all elements of the system are operating properly-- so I would look for problems- what are your symptoms? Just trying to improve cooling?
Other than that the older GM 454's engines used a high side switch to activate an auxillary fan - you may want to look up that info- from like a '95 454 Dually.
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
I installed 05+ cooling fans and cant get the pcm programmed correctly to turn the fans on with high side pressure. I got it to work with coolant temp but still not ac pressure. I didn't want to use the compressor relay because then it would run even while doing highway speeds.
I tried reprogramming the pcm with an 05 VIN and everything works correctly except the IPC dosent know what to do with the generator control module info so it just turns the battery light on and the fuel gauge reads almost full when empty.
hmm I guess I had more than one screen name that last post was me ericguy320
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