I recently replaced everything in the AC system on my 2001 5.9L Cummins.
New compressor, high and low side lines, and condenser and evaporator bottle; however, after having the system vacuumed and charged with refrigerant, the compressor will not engage unless using a jumper wire at the relay.
This was a pre existing issue before replacing the old AC system.
Any ideas?
I replaced the low pressure switch also.
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