'94 Chevy S10 Blazer strange A/C problems

My mom owns a '94 Chevy S10 Blazer with 124,000 on it. In overdrive, the air tends to shut down or barely run up hills. If you put it in drive, it usually works better. What's causing this?

Reply to
Travis King
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The RPM of the engine drives the AC compressor. When in Drive, the RPM of the engine is higher than when in Overdrive, therefore the compressor also cycles a little faster. You might check the drive belt for the compressor to be sure it is within specification for belt deflection....IOW, being tight enough. Also it may be a good idea to check the AC systems' refrigerant charge.

Hope this is of some use.......

Dave S(Texas)

Reply to
putt

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