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The AC is pulling into a vacuum and freezing at the expansion valve. Whats the problem / solution? It's really hot down here in Florida!

Proud Owner of a 1969 Mach 1
 

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Might be overcharged. Get a set of A/C lines and monitor the pressures. high side of compressor should be around 175. Low side should be around 20? this is from memory, so it may not be accurate. I will know tomorrow when I get my system re-charged (presently evacuated).


Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat

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If the low side is a vacuum (Negative pressure) and ice forms around the expansion valve, either the expansion valve is malfunctioning or a restriction (trash) in the valve. If there is a sand like substance in the valve, check for a perforated dessicant bag in the filter/dryer.

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Sounds like a blockage. Put a set of guages on it and check.

Vintage Burgundy 1966 Mustang GT Fastback (Midlife's younger brother)
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