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95 Crown Vic EATC not available Work arounds?

Oldhousehugger on Sun December 13, 2009 7:50 PM User is offline

Year: 1995
Make: Ford
Model: Crown Victoria
Engine Size: 4.6
Refrigerant Type: R134
Country of Origin: United States

Dealer said EATC was bad. I figured ya sure?! I tried getting EATC to produce error codes. It does not seem to be responding to the OFF / FLOOR then AUTO button sequence.
It controls heat and defrost and displays temperatures etc just fine but will not activate AC clutch. I hot wired the AC clutch at the relay terminal and it comes on just fine.

I have not tried bypassing the 2 pressure switches. Would this be the next step?
Also to make matters more complicated, Ford is no longer stocking parts older than 10 years. So even if I wanted to spend $700 on a new EATC head, I cannot get one. Junk yards are empty of usable ones.
If the EATC is bad but it still controls heating functions is there a way to switch on the compressor without messing with the computer? I thought of installing an ON/OFF switch in line with the 2 pressure switches and some type of thermosatic switch but I'm not sure if the 2 switches are designed for the voltage or amperage.

Any ideas?
John

Chick on Sun December 13, 2009 8:49 PM User is offlineView users profile

could be as simple as a bad cyling switch, jump it and see if it then works from the control head.. If it does, just change that switch.. does the compressor come on with defrost setting? If not, it very well may be the control head...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

NickD on Mon December 14, 2009 6:08 AM User is offline

This EATC SITE has detailed information on your system. Looks like they are using a conventional clutch relay to power your clutch. Also ran into Fords with semi shorted field coils drawing much greater than 4 amps, check that as well and had problems with mostly the vacuum switching of similar modules. Most repairable due to minor leaks.

Oldhousehugger on Mon December 14, 2009 11:49 AM User is offline

Yes,
I read that article and the guy is very knowledgeable. In it he is describing how to retrofit a manual police interceptor HV/AC control to a civilian EATC setup. It is very thorough.
I am in another boat with a bad EATC control head and no source for a new one because Ford doesn’t carry anything over 10 years old now.
Thanks for the quick reply.
John

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