Good evening, and happy Father's Day!
On my '98 V70 (215K miles), the A/C starts off blowing nice and cold, but often, especially on the hottest days, cuts out after between 5 and 10 minutes. If I turn off the car and wait a few, sometimes that works, and the A/C stays on, but that is not always the case, and sometimes it just stays off. Should I charge the A/C system, even though it's blowing cold at first? Any other thoughts?

Thanks!

Probably the compressor clutch getting hot and the gap too wide. It is easy enough to shim the 3 points of the eternal clutch. See bread clip fix.

I used aluminum sheeting that I had on my workbench. Folded it a couple of times, put glue on both sides and shoved it into the clutch plate. I let it dry overnight and all was well again until I sold the 1998 a couple of years later.

https://www.youtube.com/watch?v=2CBeTPVRN80
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Keeping it running is better than buying new

Thanks Klaus,

That video and the following one give two approaches to the same fix. I'm going to try both! Thanks again!