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Discussion Starter #1
Was plug n play. Ac doesn’t work Through the switch on dash. Ecm isn’t communicating with the compressor. Any ideas where to look
 

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Who made the harness?
 

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What computer are you running?
See this;
The 4th drawing at the bottom is how you would wire an S10 with manual A/C. Same as 03 van.
 

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