Re: Flucuating Engine Temperature
The operation of the temperature gauge like this is perfectly normal!! The Temp sensor rarely, if ever fails, it's the stat that often fails, I've just replaced mine. The following is taken from alfa156.net I hope it helps explain things -
Alfa uses a different way of showing the temperature compared
to i.e. Opel, Audi, VW. I guess Seat is VW so......
The difference is that in fact the temperature always goes up and
down because there is a thermostat (in all cars!!) that opens when
the cooling circuit reaches a certain temperature like 90dgr.
When the thermostat opens, a whole lot of relativaly "cold" cooling
drops from 90 to 70-75dgr.
Alfa shows this immediately on the temperature indicator whereas many other cars measure an AVERAGE temperature that goes up and down very slowly and certainly will not show the peaks like the Alfa way.
I guess this is done because the "normal" car driver will get in panic
and goes and see their dealer to check if nothing is wrong and Alfa is
of the opinion that Alfisti, as real, true car drivers, as enthousiastic
and knowledgeable car dirvers and can "see through" this.