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