The latest. While the engine was cold, I disconnected the temperature sending unit and turned the key on. Fuse didn't blow. I replaced the temperature sending unit with another one that I had hanging around and...incredible...no more fuse popping. Unbelievable that it was a bad sending unit. One strange thing is that the numbers were different on the two sending units - bad one is AC 85M-220B-253M, good one is AC 95M-220B-253M. The 85 and 220 happens to correlate to the two extreme operations of the TCS system - below 85F and above 220F. Coincidence? I wonder if the one I replaced it with - the one that doesn't cause the fuse to blow with the 95M - is incorrect.
Anyway, even though the fuse doesn't blow, it still seems that I'm getting vacuum all the time. There are two 'out' vacuum ports on the TCS solenoid. Either one gives me vacuum all the time. You mentioned that you converted to ported vacuum. I'm assuming you have a carb with a ported vacuum source. Mine doesn't - it only has a manifold vacuum connection - no ported source since it is a 4-speed car.
Is there a way to check the solenoid to see if it's getting power? Warning - I'm an electrical novice. I do have a multitester, however.
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