Andrew,

>From mid 80's Toyota got very tricky with little electronic boxes to monitor
all sorts of things, and I'm sure other breeds do the same. On our family
Toy, if you disconnect the fan a light comes on the dash or even if you pull
the main fuse the fan turns on no matter what the engine temp is, so they
have a second circuit for sure. The whole car is like this, if you pull a
bulb out of the tail cluster it tells you something is blown - very clever
and a bit more advanced than our 1600's.

regards,
Terry


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Andrew
Greenbury
Sent: Wednesday, 18 April 2001 11:14
To: [EMAIL PROTECTED]
Subject: RE: Thermostat housing L20B ZAC


zac/terry

I was reading a corolla manual and it said its thermoswitch
operation was such that continuity existed between the terminal
and body/ground below the cut in temperature, going to
discontinuous above this.

Is this the normal operation of a thermoswitch as I would have
thought it would be opposite? Anyway for safety this corolla switch
allows the thermofan to automatically remain on if anything
happens to the wiring (eg switch disconnected, wiring cut).

andrew


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