The sensor buried in the evaporator coil is the *freeze* sensor, not the T-stat sensor (at least in my '86).  This sensor is to detect coil freeze-up (like that happens in these beasts) and shut off compressor before it's damaged.  The T-stat is (in my case) part of the temp control switch.

Keith Hughes
'86 Westy Tiico (Marvin)
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 Date:� � Thu, 13 Nov 2014 19:33:55 -0800
 From:� � Dan N <dn92610@GMAIL.COM>
 Subject: Re: Removing the rear AC top cover
 
 thanks Dennis...
 
 the AC temp controller was bad... I got a replacement which
 works fine ...
 now I get stuck with the sensor buried deep somewhere in the
 evaporator...
 
 the cut and splice idea is perfect... I agree for not to
 create another
 problem after open it...
 
 thanks again
 
 dan