Found the thread: viewtopic.php?f=1&t=84322&p=462504&hilit=noise#p462504

You can remove the fan power module and inspect the evaporator or use a bore scope down the fresh air intake under the windshield cowl. Basically , you diagnosis the evaporator by elimination. Use some Freon/dye in the system then inspect the fittings with a black light. My semi-educated guess as to...

Eric the Car Guy made the off-hand comment that 80% of freon leaks are at Schrader valve in the filler port. It looks like a tire stem but it's a little bigger and you need a special tool to change it. NAPA has them for ~ $8.00 branded for GM but appears to be the same thing Volvo used on the P80's.

Hello ladies and gentlemen. I'm starting a money pool / supporting program to get free Volvo parts to those in financial distress. Contact Matthew if you need parts and are in financial distress. FDPP Status Here is the Here is the FDPP Status Thread . It has the latest on the overall lifecycle of a...