What is your question?
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What is your question?
I put in freon, it cooled for about 15-20 mins, and that was it...
What makes this problem better or worse?
Don't know
How long has your 1999 Mercury Mountaineer had this problem?
Few years
Optional - have auto repair facility perform leak deciton testing so leak can be pinpointed then repaired so system can be properly re-charged. Good luck!