Re: IML: Autotemp check valves

["Robin Giesbrecht" <robings@xxxxxxxxxxx>]

Tomorrow I will get what info I can off the check valves I installed. A 
check valve is a check valve. I have been busy replacing my compressor 
clutch as my compressor seems to have a problem and the clutch bearing burnt 
out in a big way. The compressor will turn to a certain point and then 
something internal is stopping it. I recall hearing a faint rattling noise 
every now and again for the last few weeks. I was worried it might be my rod 
or main bearings. Looks like it was my compressor. The other night coming 
down the 25 mile hill into town my belts made a loud squeal and I had a 
burnt rubber smell.Sqealling lasted only a few seconds. Not good. Carried on 
as all readings were ok and I was almost home.Got the pulley off today and 
the bearing is one burnt mess.Got real hot. Oh well. Borrowed the one off of 
the 70 Newport for now. Have to sort out the compressor.

Robin Giesbrecht
72 Imperial



> From: "Peter Engel" <peter.engel@xxxxxxxxxxx>
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> To: <mailing-list@xxxxxxxxxxxxxxxx>
> Subject: Re: IML: Autotemp check valves
> Date: Wed, 2 Feb 2005 19:23:18 -0500
>
> Robin and other interested parties,
>
> The Auto Temp system in my 70 drove me crazy for years.  I had the normal
> "no blower until I first switched to defrost" and a persistent "farting
> noise" (as described by my 10 YO daughter) that seemed to come from the
> programmer/amp.
>
> After installing an NOS pushbutton assembly and considerable, 
> back-breaking,
> vacuum line tracing/testing and electrical testing, I, too, discovered that
> BOTH of the check valves in my system were bad.
>
> These things are made of plastic and the two halves are forced together and
> melted into one piece.  An interference fit inside causes one part to
> stretch and break (as visible in the pic).  Because of this manufacturing
> method I have little or no confidence that NOS parts would fare any better
> than junkyard parts.  Especially when NOS parts are going for $40 a pop 
> with
> no guarantee that they will work (and are not returnable).  My system
> remains unfixed.
>
> As a sidenote, these checkvalve were used in just about ALL Mopar big car
> A/C systems for years, regardless if they were Autotemp or not.  Check your
> local junkyard.
>
> Here's a link to a check valve autopsy photo:
>
> http://bos-engel.com/imperial/theworks.jpg
>
> I've been meaning to shop industrial catalogs and piece together a
> replacement but have not done so yet.
>
>
>
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