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Message: [QUOTE="Lethalthreat7.3, post: 675639, member: 10651"] Try looking at the items I listed. I can go into detail about the pressures, delta drop through the a-coil and the condenser and tell you to mount a fan to simulate 35mph going down the road but that is info overload. Locate the low pressure cut-off switch at the accumulator. ( accumulator is the long, black cylinder located on the passenger side at the heater box. The switch screws onto a schrader fitting and has two wires. Unplug this and put a jumper here. You won't hurt anything. If the compressor engages you have either a low charge condition or a faulty switch. Make sure you have 12v going to the pressure switch, truck on with AC running, truck doesn't have to be running, just on. You should hear the clutch "click" when it pulls in. If this happens you will need a shop to put gauges on. I could help if you were in the Denver area. Been doing AC since '86 on just about everything you can imagine, commercial stationary, heavy mining equipment and just about every people hauler you can imagine, buses, trucks, suv's, cars, just about everything including huge commercial freezers that can't rise above -40. [/QUOTE]

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