It's kewl.
Just didn't wanna get too far off on something else.

Ian 80, I recommend that you remove the entire heat/air system and install a totally new one made by Hot Rod Air.  Their system always works, it is reliable and all of your problems will be solved, including most of your vacuum problems.  See hotrodair.com.  Believe me, you will be chasing a/c and heat problems for the rest of the time you own the car unless you change the entire system.  They were never reliable, even when new.

I'll look them up.  Thanks

Kind of expensive.. I was hoping I would get some advice on troubleshooting the stock system.

Hot Rod Air issues.  Thermostat switch which they provided failed.  Called HRA in early October for a new one, which should be under warranty, they said they would send it immediately.  Every week for the last month I have called them for status which always has been that their supplier has sent them, they will arrive any day and HRA will send it as soon as it arrives.  Even talked to the owner two days ago who indicated that the switch should arrive yesterday and would be shipped.  Guess what, the switch did not arrive.  Bottom line-good system until something fails and then their product support is lacking.