Interesting discussion. Please be aware that evaps under the front seats facing forward are not likely to give you the performance you are seeking. The reason evaps are normally in the dash or under the dash blowing the cold air to the rear of the vehicle is because if the face feels the cold air th...

Could this be the clutch

I don’t see much sense in trying to overhaul that comp. See if Tim the site owner can suggest a replacement. If he can be a sport and buy it from him, his prices and quality can’t be beat

Or the coupler is not all the way on

How many miles? Pressures are at what rpm? Should be at 1500 for accurate diagnosis. Cabin fan on max. Cabin temp set as low as possible High is not very hi for 100F How do we know ‘there should be plenty of 134’ After the repairs were made, was the 134 weighed in or just guessed? Post answers. It m...

You can never tell

I would advise a reclaim of the refrigerant using an RRR machine, obtaining a well held vacuum, and recharge to factory specs before going further.
We have no idea what kind of service the car received.

Such re-use is permitted by law

Thanks, Tim

Be careful that you are not running low on oil. If there is a slow leak, usually you are losing small amounts of oil as well. Look for “wet” areas at fittings, joints, etc