What prevents a Sidekick from our years(or any car) to reach 180F?

[zukitrek]

Ok. Then if all the reasons you mention for failing to reach that temp (thermostat bad , missing, upside-down , bleed hole not up hill trapping air under it,, wrong thermstat (marked say 160f) , or the rubber ring missing allowing it to float about, or clutch fan seized.) are not present then it should never fail obtaining that temp and/or above? Of cours a ten gun would validate that? Are they the real deal, I mean accurate or very close to being accurate?

BTW I saw the fan clutch and by the looks of it I said, how in the hell this works? Is only moved by the belt.

Thanks!!