Re: IML: 81-83 AC question

[Jason Wulf <jrwulf@xxxxxxxxx>]

In my '90 Imperial, I've been having somewhat related problems with my
HVAC.  I've been told (haven't had time to verify yet, we'll see how
that goes and I'll let you all know) that there's a check valve just
inside the engine bay from the firewall on the vacuum line that's
probably gone bad.  I don't know where yours is to help you there, but
perhaps yours is going out as well.

-Jason

On 8/12/05, Bob Smith <limoguy1950@xxxxxxxxx> wrote:
> Wayne: 
> 
> Many years ago I was told that this is the "default" position required by
> Federal law so that in the event vacuum failed (I presume in the winter)
> that air would go to the windshield guaranteeing clear vision.  I would look
> for a dried out (cracked) vacuum hose in the HVAC circuit.  Under the hood
> is a good place to start because there is a good deal of heat which can dry
> out rubber hoses. 
> 
> I don't know if the "default" reason is actually law.  It's been maybe 40
> years ago that I heard it but I can tell you that in every car I've ever
> owned (other than my manually controlled '65 Tempest), if you remove the
> vacuum hose under the hood, that's what happens.] 
> 
> Bob Smith
>  
> 
> Wayne Michaels <baker-michaels@xxxxxxx> wrote: 
>  
> Hi, Just recently my AC, under load, has started moving air flow to the
> floor and defroster vents. I know from other cars I have that this is
> usually a check valve gone bad. Does anyone know if that is also the case in
> the 81-83 Imperials? and where might this check valve be located? Could it
> have anything to do with the vacuum amplifier out on the engine? Bob 
> 
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