Yep, I installed that bolt.

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild

What were the hi/ low pressures on the manifold gauges when it blew? I recall you said the last can of R134 was leaking. Was it possible air got in due to the leak? Did you purge the yellow hose between cans?

Do you have the HF manifold gauge set? I have found that you need to use pliers to snug the fittings a bit more than just finger tight otherwise they could loosen up on you if you move the gauge set around. Did you pressure test the gauge set (easy to do with a tub of water) before use to insure it does not leak?

The quick couplers have o-rings in them. They must be well seated and not chewed up.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Does it look like this?


ROLLGUY's thread of his start to explore the use of a Sanden compressor.
I should have known better than to try to bring the GM R4 compressor back to life

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Attached Thumbnails

 

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1983 123.133 California
- GreaseCar Veg System

Just read the linked thread's first post. He said: "with the exception of a bad Klima relay, so the compressor was hot-wired". Don't know how the compressor was hot wired, but if it was hotwired to be always on, that may have been cause of the compressor blowing up.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

More importantly, did you install a hose that uses that bracket? This bracket keeps the compressor can from sliding off. If the can did slide off, I would not call that a compressor failure, more of an install issue.

If the body o ring was too small, it would have leaked from the start, if too large the can would not slide on or o ring get cut during install at the factory and leaked from the start.

What were your low and high side pressures?