a/c not working trailblazer 07 4.2
pcm no sending ground signal to relay control, compressor come on when wiring that relay to chassis, coolling ok, continuity is ok between pcm and ground leg in the relay
all fuses involved in a/c are ok, calibrated a/c module and still not working
Actuators lost calibration due a dead battery, had to use scann tool 2 original from chevrolet to get the A/C working properly.
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