Climate Control Relay

Tom Werner noonan67 at
Tue Mar 30 03:07:13 EST 2004

I've been trying to post to the list a few times today, but so far no luck.  
Perhaps the third time will be a charm.

Anyway, I evac'd and recharged the a/c system on my 200q yesterday.  All 
works well, with the climate control doing everything right (airflow goes to 
the proper vents and everything!), except that the compressor runs on econ 
and off.  In searching the archives, the likely cause was a shorted diode 
that connnects between #30 and #87 on the relay.  Sure enough, there was 
continuity between those two pins, and when I cut one of the diode leads, 
the relay acted "normally" being open in the normal condition and continuity 
between the two pins when I manually closed the relay.

So far, so good.  One of the writeups mentioned replacing the defective 
diode with a Radio Shack 50v 2Amp diode.  That would be fine, except my 
radio shack only had 1 amp and 3 amp diodes from which to choose.  So, I got 
one of each.

The question is, which one to use?  I am thinking the 3 amp, but I will 
defer to those more knowledgeable on the topic.  Also, the diode is 
directional.  What is the proper orientation?

This will be the first time doing a hack job on a circuit board, although I 
have done the basic soldering for universal oxygen sensors many, many times. 
  Any tips for soldering/unsoldering?


-- Tom

91 200q
88 80q
92 VW Cabriolet

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