[Mark66]

Joerg:

Sorry for the delay in reply to your transducer question. A couple of points for you to consider:

1) The Cadillac picture of the transducer sold by CaddyDaddy looks identical to the unit used by Pontiac B bodies in 1966 (and 1965).

2) The transducer part number you reference, 7290912, is correct for 1965 and 1966 big Pontiacs. The three part numbers referenced by CaddyDaddy in their description of the transducer they sell do not match the Pontiac part number although one is close (7291913). The fact that the part numbers are different does not necessarily mean that the units are different. If you do order the CaddyDaddy unit I would be interested to hear if it works on your car.

3) I have a used transducer from a 1966 Pontiac Bonneville. It has been in dry storage for 20+ years but I have never checked to see if it works - if you strike out everywhere else let me know.

4) Pontiac published a stand-along ATC servicing and repairing guide - I think it is pretty much a repeat of what is in the Pontiac AC service manual but perhaps with some updated diagnostic testing procedures. If you send me a PM with your email address I will send you a pdf of it.

Good luck rejuvenating your ATC system - I will soon start (trying to) rejuvenating mine.

Mark