Thanks for the info on changing the expansion valve and the tip on Nylog. I've never heard of this, but it sounds like a good product.
Does anyone know where I can buy Nylog sealant over the counter in the L.A./San Gabriel Valley area? I'd prefer not to pay shipping for just one bottle of stuff.
I know that the R12 system needs a mineral oil, but Is there a recommended brand that should be used in this car? If so, I'd prefer to buy it and supply it to the shop that's going to recharge the system than just rely on what they might have sitting around.
Anyone able to address some of my other questions?