[urq] radiator fan switch

[Eric J. Fluhr]

> Hello! One quick one... or two. Looking for the right replacement part for
> the radiator fan switch. I have discovered most of them that I have come
> across are three pin. My old one is two. Just wondering if three pin will
> work. If so, brand of choice and who has it. Also, found a two pin but the
> brand name is not familiar to me. Anyone have experience with Airtex 
> 1S4375?
> Last, trying to get the tranny filler plug out and its way stubborn!!! Any
> BTDT advice? Any better replacements if I get it out?
> Thanks a bunch!
>
> -Jim Miller
> '83 urq waiting for fresh winter coolant!

I do not know 100%, but I believe the 3-wire switch does not directly 
replace the 2-wire.
The 2-wire is design to support the entire start-up and operating current of 
the fan motor, as
it is the on-off switch for the motor itself.  The 3-wire sensors used in 
the later cars are
meant to control relays which control power to the motor.   So, the 
electrical current demand
on these is much lower.    I burned up a couple of 3-wire switches and 
eventually decided that
was the reason after studying the wiring diagrams of the Urq and the later 
Coupe GT.

I'm still using a 3-wire switch for my Urq radiator fan, but now it controls 
a relay which handles
the primary current of the motor.   It is quite simple to wire the switch up 
this way, conveniently
without any hacking of the factory harness.

Regards,
Eric
'82 urq