[DeTomaso] Console AC Anti-Icing Switch

[Dennis Valdez]

Doug,
I haven’t tested the switch, but have just replaced mine. The earlier switches only had two blades to connect to. Both the condenser fan and compressor cycled at the same time. Later switches with the three connections allowed the condenser fan and compressor to be controlled independently.  

The 3 wire switches are very hard to find. Venders carry the two wire switches.  

Here is a pic of how my 3 wire switch is connected.
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Dennis Valdez
Sent from my iPhone

> On Jun 22, 2024, at 12:28 PM, Doug Braun <doug351c at gmail.com> wrote:
> 
>    All,
> 
> 
>   There are 3 wires going to the AC On/Off switch and Temperature Control
>   on the console.
> 
>   Brown (from fuse 10), W/BK (AC clutch relay) and B/BK (condenser fan
>   relay).
> 
> 
>   The full car wiring diagram calls this switch the "Anti-Icing Switch".
> 
>   SO Bill's diagram labels one half of the switch ("Icing" Switch 1) and
>   the other half the (AC On Switch 2).
> 
> 
>   One would assume then that the brown wire goes to the 1/4 " tab that is
>   partially shrouded by the black side cover.
> 
>   And that the other two 1/4 " tabs marked "1" and "2" on the switch
>   correspond to SO Bill's "switch 1" and "switch 2" designations.
> 
> 
>   My  problem with all of this is that I believe SO Bill's switch numbers
>   may be wrong.
> 
>   I tested my switch with an Ohm-meter and an ice bath yesterday.
> 
> 
>   When I connected my meter between the black end cap terminal and the
>   1/4" tab labeled "1" on the switch, the continuity remained constant
>   regardless of whether the probe was in or out of the ice bath.
> 
> 
>   When I tried the same test with my meter between the black end cap
>   terminal and the 1/4" tab labeled "2`" on the switch, I got continuity
>   with the probe out of the ice bath and an open circuit with it in the
>   ice bath.  But this is the action I would expect from SO Bill's switch
>   #1.
> 
> 
>   Has anyone else ever tested this?
> 
> 
>   Doug Braun
> 
>   Soon to be Blue again 73L #5505
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