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1997 gmc sierra 3500

   
Old Aug 23, 2020 | 02:42 PM
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Default 1997 gmc sierra 3500
a/c clutch will not engage. full charge switches good relay good 3 different control modules tried. no ground to relay. i can jumper the relay 30 and 87 works fine
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Old Aug 23, 2020 | 02:43 PM
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Verify ground and 12v at a/c clutch?
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Old Aug 23, 2020 | 02:56 PM
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Default 97 gmc 3500
12 volys only when relay is jumpered 30 and 87
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Old Aug 23, 2020 | 03:01 PM
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So are you getting power to this relay or no ground?
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Old Aug 23, 2020 | 03:11 PM
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Default 1997 gmc 3500
co ground to a/c clutch dont think my pcm is sending ground signal to pcm
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Old Aug 23, 2020 | 03:13 PM
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i mean pcm is not sending ground signal to relay
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Old Aug 23, 2020 | 03:14 PM
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im new on here dont know exactly how to use forum
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Old Aug 23, 2020 | 03:16 PM
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power to relay 13.2 volts but no ground signal
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Old Aug 23, 2020 | 03:25 PM
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Originally Posted by 2011Camaross
i mean pcm is not sending ground signal to relay
Probably a good chance its not seeing a command signal from the HVAC head.
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