Question about 1997 Toyota Tacoma

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How do you know for sure the compressor is bad in a 97 tacoma for the air conditioning?

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  • Bruce Hathcock May 11, 2010

    If you put a set of gages on the low and high side it will tell you the pressure reading, if the compressor is bad the pressure will stay the same, for instance at 70 degrees Fahrenheit the two gages will read about 70 pound per square inch. Normally the compressor would read on a good compressor low side 30 to 30 PSI and high side 275 to 325PSI high side with the temperature inside the center vent max AC fan on high using R134A would read 34 degrees out the center of the console. If there is no refrigerant then it would not build up pressure, and if that was the case you would bypass the low pressure switch to make the compressor come on to see if it worked and would add some refrigerant to see if the pressure would rise on the high side. but inf the low side started to rise that would mean the compressor has no suction thus telling you the compressor is bad.

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There are a few things here that could prove compressor failure.A set of ac manifold Gauges hooked up while compressor is running. Gauges will "shake" or jump around.. Next would be noise from the compressor itself.BUT, there are other things that could make someone think its bad. Compressors have clutch assembly on the front. there is a bearing there that could make noise when compressor is not in use. The clutch itself can start to come apart. There are a few others but would need a little more detail on whats going on.

Posted on Jul 23, 2009

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Unplug the wire at the end of the compressor,you will see two pins take a wire attatch it to the positive side of the battery and feed the compressor direct the magnet clutch should pull in if it is bad it will not.

Posted on Jul 23, 2009

  • Leonard Williams Jul 23, 2009

    unplug the wire at the end of the compressor,you will see two pins take a wire attatch it to the positive side of the battery and feed the compressor direct the magnet clutch should pull in if it is bad it will not.

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