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It is R134. The port is either on or close to the receiver dryer or the shinny can thing in the right rear of the engine compartment.

No, actually a 1988 model year vehicle would have come from the factory with an R-12 system. If you're not the original owner of the vehicle, I would strongly recommend that you have a refrigerant purity test done on your vehicle - many R-12 systems were converted to R-134a, but retained the R-12 schrader valves.

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โˆ™ 2012-02-24 05:32:11
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Q: Where is the low pressure valve to add freon on a 1988 Corsica?
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