my yukon was one of the ones the factory installed the engine and the Air Conditioner harness had been wrapped under the lower control arm and eventually wires broke.I repaired them charged the system(just to have done by shop ) and there is still a problem.
1.no power to the ac compressor plug
2.not getting any voltage at the lower pressure switch plug.the one down low on the line.
3.have voltage at the topside pressure switch plug.
Ive gone through all fuses,relays and all good.have even gotten a new HVAC control module unit.the old one had a line through the "snowflake" possibly due to the broken wires.now the new one dosent due that.
so can anyone help? thanks