My car wouldn't even think about 80C and most of the time ran closer to 60 on cooler mornings. I replaced the stat. w/ the Behr 80C and now it runs steady at about 90. If that doesn't warm it up enough, then you can always add cardboard.

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85 300D (California) 220k
03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada)
03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico)
Diamondback hybrid
Element skateboard(mileage unknown)

Good news for diesel owners...There's no such thing as cold...only the absence of heat!

"Beer is proof that God wants us to be Happy." Benjamin Franklin

"Possession....the King of sin." The Avett Brothers