[200q20v] Thermostat: 80C vs 87C

Gene Caldwell optic at halcyon.com
Tue Feb 27 22:46:24 EST 2001

"Martin, Gary G" wrote:
> Okay, I'm going to beat this horse some more.. S4/200 I5 engine. Which
> thermostat, 87C or 80C. I know this has been discussed before. Looking at
> Bently it refers in several places to "bring engine to operating temp of
> 80C" and then in the coolant section states " thermostat opens at 87C and
> closes?? at 102C". Bad wording there, I think they mean it's totally open at
> 102C. I know from prior discussions that S4 seems to  have some 80, some 87.
> Does anybody know for sure which is correct and/or does it make any
> difference?  Your FINAL answer please. :-)
> Gary
> 94S4 (87C)   91 200 TQW(soon) ((80C or less))

I like the warm running 87C here in Seattle.  If I was going to be
driving where the ambient was over 90F a lot I'd go with the 80C.


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