134a PLUS Extreme Cold Performance Booster, No. 685

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April 3, 2026
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The FJC 134a PLUS Extreme Cold Performance Booster, No. 685, comes in 12 oz. and is designed to lower duct temperatures up to 15 percent. This product aims to extend compressor life, remove moisture, and restore seals and O-rings. Compatible with all Ester and PAG oils. Not for use on electric or hybrid vehicles. Features a seal-sealing top.

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