Date: Thu, 1 Jul 2004 14:14:02 -0700 (PDT) From: David Duricy <desotobravo@xxxxxxxxx> Dave, If the 68 Autotemp system is like the 70 (and I think it is) there is no motor inside the servo box. There's simply a big vacuum servo and it operates sets of contacts. There's also a vacuum modulator to control vacuum level. I had the box apart on my 70 and took lots of pics. I was trying to find the cause of a continuous "farting noise" (description courtesy of my 12 YO daughter) and checked out the servo box. In my cars case the problem turned out to be the vacuum check valves that are located under the plenum. These fail and the system won't operate properly. I've been trying to find a source for new valves but don't want to pay $40 for an NOS part that probably has the same problem as my parts. And the parts are non-returnable... Here's a shot of what's inside the box (300k). I have more pics if you're interested. http://www.bos-engel.com/imperial/brainguts2.jpg Pete in PA Subject: IML: AutoTemp I (1968) Reply-To: mailing-list@xxxxxxxxxxxxxxxx My work on the 1968 Imperial Crown convertible has gotten to the point where I am testing the AutoTemp. The AutoTemp has an interesting problem. I believe that the system was working correctly when I bought the car, and was still working correctly when I first re-started the AutoTemp today. However, the servo began to make a grinding sound, while I noticed that the system would not start on "Auto" but would start on "Hi-Auto", "Def", and "Hi-Def". After the system is on, pressing "Auto" turns it off. Pressing "Off" causes a buzzing sound, which I think is the circuit breaker, and cuts the fan abrubtly and leaves the A/C doors open. I cannot hear the servo trying to park. My bet is that corrosion has gummed the servo works, causing the motor therein to jam, and thus trip the breaker. Does this sound reasonable to those of you who have worked on this system? I'd like to open the servo box. Does anyone here have experience with this style servo? I'm curious to know how similar or disimilar it is to AutoTemp II. Thank you for your insights! Dave Duricy