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Do you hear the compressor running or not?
Did you check the DC fuse on the back? Any display on?
Is this built into the cab or not? Any display on?
Any display on or indicator lights?
It will probably need to be pulled out to check it. Most have a fuse on the back which may have blown. Hopefully, the lower voltage and resulting higher amperage draw didn't hurt the compressor. Once it is removed, it can be tested first to be sure it is o.k. before reinstalling it again. Please get back to me if you need more as all follow ups are included in our fee.
You are welcome! Thanks for coming to Just Answer with your question.
Then it got damaged or else the coolant is gone. Doubtful this is going to be worth fixing, but you can check at a dealer who sells these. Sorry that wasn't good news here.