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This one has me stumped. ..I have replaced the evap temp sensor which ohms out at 3ohms about 80degrees. Now on my third control head. I have checked evap temp sensor, pressure transducer. All the relays and fuses are good. Checked resistance from control head to ecm all good. Supplied ground to pin 64 @ ecm and compressor comes on. Jumped compressor relay compressor comes on. The control head will work and show on in gds until I plug ac relay in then no more ac input to ecm. There is a 2.6v reading on the ecm side of ac relay when not installed then it drops to zero when ecm provides ground. Any help would be appreciated. We have had this car for a week.thanks
 
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