I have a very strange air conditioner. Some days it cools my car very well and I am too cold; the next day, it won't cool well and I will be too hot. This has no relation to the outside weather. It can be 100 degrees outside, and 60 degrees inside my car, or 85 degrees outside, and 82 degrees inside my car, with the ac on. Any ideas?

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Jacob Wissler Jr., Houston, Texas, 1984 300 SD