Use the relay for sure and make certain to fuse things properly.

This wiring is all so simple to begin with I don't see why you wouldn't
just go with the stock setup. Stock wiring would be the more reliable
choice, IMHO.

Why would you want to connect both the higher and lower temp switches to
do the same thing? Any time the high temp switch is triggered the low
temp switch will already have been activated first so the higher temp
switch would add nothing in that case.

Be careful when adding a lighted switch to this circuit as many lighted
switches connect the output leg of the switch to ground when the switch
is off. Not realizing this could cause the fan fuse to blow when a temp
switch was triggered while the manual switch was off. Really.

Mark

neil N wrote:
> Hi all.
>
> If I'm reading this correctly, P 97.66 in Bentley shows a relay that
> when energized by "Rad Fan Thermo Sw II", energizes the higher speed
> of the Rad fan.
>
> Is the relay there to handle the higher current? Or am I totally
> misunderstanding the purpose of the relay?
>
> And when I install the cooling systems' electrical components into my
> air cooled Westy, (Jetta Gas engine conversion) could I eliminate the
> Rad Fan Relay?
>
> Could I also wire the circuit so when either "Rad Fan Thermo Switch" I
> or II is activated ONLY the high speed portion of the fan is
> energized?
>
> Are these bad ideas? I was going for simplicity and more reliability.
> (no relay to fail)
>
> FWIW, I will wire the fan circuit with an "override" switch and LED.
>
>
> Many TIA,
>
> Neil.
>
> --
> Neil Nicholson. 1981 Air Cooled Westfalia - "Jaco"
> http://web.mac.com/tubaneil
>
> Engine swap beginings: http://tubaneil.googlepages.com/
>