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Freon is a trademark specific to DuPont. Your 1997 Blazer uses R134a, and has a Fixed Orifice Tube system. On the sticker by the evaporator, the manufacturer recommends the system be charged to 1 lb, 14. oz (30 oz.). This is also verified in the owner's manual, although the owner's manual incorrectly translates this to two pounds (it's actually two ounces short).

I can stand by this answer wholeheartedly, because it just so happens that I also drive a 1997 Blazer, and I do my own A/C system work.

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Q: How many cans of freon does it take to recharge a air conditioner on a 1997 chev blazer?
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