Question about 1989 Chevrolet Corvette

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What kind of fittings are use to hook up manifold gages to the high and low side so the system can be vaccuated?

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To evacuate, you need a set of gauges between the pump and the a/c system you only open the low side. The gauges will need to have the appropriate fittings for your system. After evacuation to about 21" of vacuum, watch gauges and make sure reading does not change (if it does likely you have a leak somewhere). Recharge through gauge set on low side as well.

Posted on Jun 15, 2009

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Where is the low side A/C port?


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Need to recharge the a/c in a 2007 Saturn Vue. Where can I find a diagram that shows the different hoses and lines? Or which hose or line do I use for the Freon?


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Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
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1 Answer

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