C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Nov 18, 2012 | 07:13 PM
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Default Air conditioner

The a/c on my '90 Vette will not click on. The fan blows,but the compressor will not engage. The fuse seems to be good. Any suggestions?
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Old Nov 18, 2012 | 08:41 PM
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A few simple places to start is the low pressure cycling switch and the static pressure of the Freon in the system.

You can check take off the connector of the cycling switch and check the resistance to see if it is closed. And you can also jump the 2 wires in the connector and see if the compressor starts.

Static pressure should be around (ballpark) 90-100 lbs normally. But anything above 50 lbs should close the switch. You would have to lose a lot of gas to get below 40 lbs.

Check the compressor relay and the connector and pins for corrosion.
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Old Nov 18, 2012 | 08:56 PM
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Originally Posted by supersl01
the compressor will not engage.
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Old Nov 18, 2012 | 08:58 PM
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Old Nov 18, 2012 | 09:00 PM
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Old Nov 19, 2012 | 04:08 PM
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Default air conditioner

Originally Posted by pcolt94
A few simple places to start is the low pressure cycling switch and the static pressure of the Freon in the system.

You can check take off the connector of the cycling switch and check the resistance to see if it is closed. And you can also jump the 2 wires in the connector and see if the compressor starts.

Static pressure should be around (ballpark) 90-100 lbs normally. But anything above 50 lbs should close the switch. You would have to lose a lot of gas to get below 40 lbs.

Check the compressor relay and the connector and pins for corrosion.
Thanks, will check it out.
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Old Nov 19, 2012 | 04:10 PM
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Default air conditioner

Originally Posted by vetteoz
Thanks for all the info. Will get to work to check it out.
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