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

[Warren Wallingford <warren@xxxxxxxxxx>]

Sounds as if the diode tree that's supposed to prevent this sort of 
thing has been bypassed, or perhaps one of the diodes has shorted.  I've 
not ever seen that.  Those diodes are in the relay compartment and are 
associated with the orange/black wires.  The circuit is shown in the 
heating and A/C section of the workshop manual.
Warren at DMC


Marv Hein 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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