Question about 1994 Toyota Pickup

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I put a can of 134a it seemed to help but still blew hot air sometimes while putting in a second can I noticed the cluch on the compressor engaging and dissenguaging quickley.Is the compressor bad?

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1) get a gauge to check on the low side pressure when adding refrigerant to see if it's too low or too high.
2) if in the proper range check again in a few days to see if the pressure is holding and you don't have a leak that requires a teardown & repair.
3) the fact that the compressor (clutch) IS engaging and disengaging suggests that that part of your system is working ok. IF you can get normal refrigerant levels then you can start troubleshooting the fast cycling.
4) and online manual here:

Posted on Jul 31, 2010

  • JeB
    JeB Nov 21, 2010

    The link to the manual is no longer good ... here's another site:

    Also remember to run your a/c every week to keep seals lubricated, etc.


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On the contrary, the low pressure switch located close to the service port you are using to charge the system is the one sending the signal to the computer to shut down to protect the compressor because the pressure is low (not enough refrigerant)

You have two options,
To unplugg the electrical connection to the Low Pressure Sensor and stick a jumper wire in the plug, to trick the computer into letting the compressor to work so you can recharge the system faster.

the othr option is to keep trying to recharge the system the way youu have been doing it and wait for the pressure to build up so the compressor can engage and start succioning the refrigerant.It may take a long while before this happens.

Don't forget to rate this post!!! Good Luck!!

Posted on Jul 20, 2010


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