Re: IML: AutoTemp II insight

["Peter Engel" <peter.engel@xxxxxxxxxxx>]

Yes this is exactly why the Autotemp in my 70 has been screwed up for
years.  In my case BOTH the check valves are bad (using the service
manual test, that is....)

There are a few vendors who have NOS parts but, at $40 a pop, I'm not
ready to buy.  Mostly because there's no guarantee that the NOS part
will work and they're not returnable.

I've take one of my old ones apart and see that a plastic disc is force
fit into a plastic cylinder.  In my opinion the cranking that occurs is
quite likely to happen from age in an NOS part.  

See the parts here:

http://bos-engel.com/imperial/theworks.jpg

I'll keep looking until I find a junkyard car with a good pair.

Pete in PA


Date: Fri, 12 Nov 2004 15:06:04 -0800 (PST)
From: David Duricy <desotobravo@xxxxxxxxx>
Subject: IML: AutoTemp II Insight

<snip>

Now the hiss was gone, but the fan would only come on
in DEF or HI DEF. After DEF or HI DEF had been
pressed, the fan would stay on if AUTO or HI AUTO were
pressed, but neither AUTO nor HI AUTO would trip the
fan if pressed first.

This is a symptom not listed in the service manual.

The cause turned out to be a faulty number one check
valve in my replacement vacuum harness. With a good,
used check valve installed, the fan came on just as it
should in all modes, and the AutoTemp is working
great.





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