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Originally Posted by Pres712
Dave: Are you running your A/C? I guarantee that my '86 will run all day, on the road, at 160 and my '03 will run at 172. BUT, turn on the A/C and the '86 will shoot up to 186 and the '03 will go to 185. These are readings off the digital dash. The '86 does not have an "auto" setting and I never use that setting on my '03, so these are manual settings.
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My numbers are for A/C off.
Your '86 is a different situation, since the thermostat is located in the convential position- not in the engine water inlet side as in the C-5 and C-6.
Yes, your '03 will run at 172 but ONLY WITH A 160 STAT. A 180 stat will not run at 172 in a C-5.
Let's remember the original issue was a 180 stat in a C-6.
As I said, a 180 stat in a C-6 will not give you 180 running temperature. A 160 stat will give approx 180 running temp at normal cruise, A/C off.
A Vinci 170 stat will give you approx 190.