quirky A/C (any other kind?)

[pjrose@servtech.com (Phil and Judy Rose)]

My Audi mechanic thinks the AC ('89 100) probably just needs some more
freon, but much of the time it behaves perfectly OK--as long as it's not
too hot outside. The problem is that the AC fails to go on when the outside
temperature is near 80 deg F, or higher!!! I know the system is supposed to
keep the AC from working when the outside temp is too low, but can the temp
be too HIGH??? Is this actually a symptom of low freon pressure?

BTW, when the AC turns on (temp below, say, 75 F), it appears to keep going
even when the outside temp rises to that magic (higher) level. And it cools
very well, IMO. But if the ignition is switched off when temp gets to 80 or
above, the AC will probably fail to work after a restart. So is more freon
gonna eliminate this symptom, or is the controller or some sensor screwed
up?

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         *  Phil & Judy Rose     E-mail:              *
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