Question about 1991 Buick Roadmaster

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91 Roadmaster, Auto A/C, no power to A/C relay. What should I check first?

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1- Check the fuses, switches etc (its the most obvious places, and cheapest to check)
2- Check your freon - if you have an a/c gas leak, the pressure switch on the gas line (a/c gas, not fuel!) cuts out, causing the relay to de-energise. It's a safety measure to prevent damage to the compressor if the pressure is too low.

I hope this helps!

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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