I think Rick meant to charge the system (it doesn't need a full charge to sniff) and THEN sniff out the system. Larry Bible feels UV dye is the better way to determine whether the evaporator leaks.

Your entire system needs to be evaluated BEFORE you start replacing parts. Its really throwing money down the drain if you replace parts piece meal on an a/c system.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)