FCBO Gold Member
- Mar 19, 2013
- Reaction score
- Coral Gables, Florida
This is not my first attempt at repairing Automatic Temperature Control (ATC) systems. Having successfully beaten several Cadillac climate control systems into submission in the past, fear was not a determining factor in keeping me from digging in and trying to learn about and trying to bring back an ATC II.
In response to what was perhaps a casual suggestion, I thought it would be useful to both current and future members for me to create a specific record of my process in bringing the ATC II system in my 78 Chrysler New Yorker Brougham back into a functioning system.
Besides, after just getting mine to work, I will be taking it apart again to change out a leaky evaporator and possibly dodgy heater core in order to get my system back up and running reliably for the next few years....hopefully.
If your expecting this thread to be an extremely technical dissertation, it will not be. I’m thinking most people drawn here will just want to trouble shoot and repair their system. So that will be the focus, as it was mine at the time of this writing. After all, you don’t need to know the exact chemical composition of gun powder, the thermodynamic wonder of combustion or it’s exact burn rate to be able to effectively load, use or diagnose a problem with a firearm.
Likewise, if you want to learn about general manually controlled HVAC systems and their operation, repair etc. you need to come into this already knowing well how that works for this thread to be of use. After all, the ATC II, as the name implies, is about the automated control of both the heating and refrigerated air conditioning system.... so you don’t have to.
Before I began my repairs, and even before I actually had the car delivered, I began by doing research on this site, the web and factory service manuals that were relevant. Among the best information and source for needed parts was the Imperial club.
Online Imperial Club (OIC) for Imperial, Chrysler Imperial, and Chrysler New Yorker Brougham Enthusiasts
A fairly in depth description is available to anyone on this site which is a good way to start. In fact, I would read the article on the first version of the ATC II in the 69-73 earlier version of this system to understand not just it’s operation but the evolutionary advances made in the later 74-78 version to be described here. Likewise, for those so inclined, this specific article will greatly help you make sense of the actual Factory Service Manual description. It did for me.
What I will be describing over the next few postings will be: The basic operation of the system; Location and description of the components with pictures of both the parts and their location and; Finally, I will try to make a more useful trouble shooting guide to put down what I’ve learned in a useful series of checks and observations specific to the later version ATC II.
Because of the wealth of information in the enthusiastic community of owners, any and all relevant comments are welcome!