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Thermostat Temperature Theory

posted by  jadnhm on  Mon Nov 7 09:52 CST 2011
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last visit: Tue May 22 18:03 CST 2012
[RELATED]

Hi All,

I'm currently considering that my thermostat may not be functioning as I want.

I have read that turbo engines take a 87C/189F thermostat, while NA models take a 92C/198F thermostat.

While my car has the turbo engine, I am pretty sure the last time I replaced the thermostat I bought a 92C/198F because (I reasoned to myself, without reading up on it) that I wanted better heater output in the winter. It seemed reasonable that hotter engine = hotter heater output = warmer me. It doesn't /really/ get that hot in the summer here (max is about 38C/100F for a couple of days every summer but more often we won't see many days above 32C/90F) so I wasn't concerned about that.


Can anyone explain to me the reason why the turbo engines use a colder thermostat? Conversely, why do the NA use a hotter thermostat?

I think I understand the problems with a thermostat that's too cold, but can anyone give testimony as to the repercussions of using a thermostat that's too HOT?

All thoughts are welcomed. I"m looking for a theory lesson here.
--
1998 V70 AWD->FWD->AWD Turbo 220k+






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