thermostat switch 3 connections

I had to renew the thermostatswitch in the radiator of my Porsche 928 1978.
It used to be a switch with 2 connections. The alternative part for this is
an Audi switch with 3 connections, apparently for 2 temperatures (as on my
former Audi 90 2.6E). My Porsche only knows one speed for the fan so I want
to connect it to the lowest temperature of the 2 available on the new
switch. Which connections should I use?

On Thu, 17 Aug 2006 20:11:37 +0200, "Ad" > wrote:

> I had to renew the thermostatswitch in the radiator of my Porsche 928 1978.
> It used to be a switch with 2 connections. The alternative part for this is
> an Audi switch with 3 connections, apparently for 2 temperatures (as on my
> former Audi 90 2.6E). My Porsche only knows one speed for the fan so I want
> to connect it to the lowest temperature of the 2 available on the new
> switch. Which connections should I use?

Hi,

I don't know how they switch, but I would suggest you put a multimeter
on it and heat it up (with a hair dryer on in near-boiling water. That
way you should well be able to determine its switching behaviour.

Christoph

"Christoph Bollig" > skrev i en meddelelse
...
> On Thu, 17 Aug 2006 20:11:37 +0200, "Ad" > wrote:
>
>> I had to renew the thermostatswitch in the radiator of my Porsche 928
>> 1978.
>> It used to be a switch with 2 connections. The alternative part for this
>> is
>> an Audi switch with 3 connections, apparently for 2 temperatures (as on
>> my
>> former Audi 90 2.6E). My Porsche only knows one speed for the fan so I
>> want
>> to connect it to the lowest temperature of the 2 available on the new
>> switch. Which connections should I use?
>
> Hi,
>
> I don't know how they switch, but I would suggest you put a multimeter
> on it and heat it up (with a hair dryer on in near-boiling water. That
> way you should well be able to determine its switching behaviour.
>
> Christoph
>

On the Audi 2,6E the first switch closes at 92-97 deg C and the second one
at 99-105 deg C. The terminals on the switch should be marked "1" for the
low temp, "2" for the high temp and "+" for the common terminal. Connect
between "+" and "1".

Try Christoph's metode - put the thing in water and heat it up - the low
temp switch should close before it boils (100 deg C)

Rgds

Jens