[DML] Re: A/C compressor tied to fans?
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[DML] Re: A/C compressor tied to fans?

There are two diodes in the fan ciruit.  One prevents the otterstat
from switching on the AC compressor, and the other one prevents the AC
compressor from powering the IGN circuit via the otterstat.  They are
taped together underneith and on the right side of the main harness in
the electrical compartment.  It is possible yours have either failed,
inproperly installed after PO work, or nonexistant.  However there is
another possibility.  If the PO installed some "custom" wiring when
installing the new compressor, and tied it directly into the otterstat
circuit since the two devices are relatively close together in the
engine compartment.  Visually check that first by verifying that there
is only ONE cable going into the AC compressor (pink on harness side)
and that nothing is tapped into it.  Also check the otterstat wires to
ensure there are only two of them and nothing is tapped into them. 
Once that checks out verify the presence, installation, and operation
of the diodes.

Jim Reeve

--- In dmcnews@xxxxxxxxxxxxxxx, "Marv Hein" <marvhein@xxxx> wrote:
> My PO installed a new A/C compressor and it seems some monkey 
> business may have happened in the process.  I didn't notice it until 
> recently because I ran the A/C all summer.  
> Whenever I turned on my A/C, my fans would come on and stay on as 
> long as the control was set to any of the A/C settings.  I 
> understand this is good. However, the inverse seems not so good. 
> Example:
> Vent controls set to "vent," engine idling, compressor not running
> and front fans not running. Engine warms up to around the 1/4 mark, 
> front fans come on and compressor simultaneously engages. Cool air 
> comes out of my vents.  I can overcome it by turning the temp 
> control to HOT, but the compressor is still doing its thing. I 
> have "automatic A/C!"
> I'm guessing this is abnormal behavior? Trickery, if there was 
> trickery, may lie in the relays?  
> Any suggestions appreciated.
> Thanks,
> Marv
> #10820

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