Auto Temp II

[roadhogg@xxxxxxx]

The 68 system is quite different from the 74 system.  This should be a very 
easy problem to diagnose and repair.  I see no need for radical surgery at this 
point.  The 74 system is a rather simple system when broken down into its 
components.

----- Original Message -----
From: ViaJoaquin@xxxxxxx
Date: Tuesday, December 24, 2002 4:42 pm
Subject: Re: IML: Auto Temp II

> In a message dated 12/24/2002 3:04:50 PM Eastern Standard Time, 
> markblitman@xxxxxxxxxxxxx writes:
> 
> > i depress the LO or HI-Defrost button on my '74 Imp to get the 
> fan working for a few seconds and then I depress the LO-HI- Auto 
> button and I hear the blend door close(or is it 
> > opening?) and then the A/C works normally....
> 
> Mark,
> That is a solution that dates back to the original ATC, in fact it 
> is written in the 68 FSM! What happens is that the vacuum check 
> valves start to stop checking and that is the only way to fool the 
> system into doing what you want it to do. Since it is such a long 
> discovered problem, the only solution would be to live with it or 
> replace the switch and all the vacuum circuits.
> 
> Roy
> 67 Crown FDHT
> 
>