There are 2 temp switches at AutoZone. Both are adjustable. The ones temp range is 32*-258*F. The other is 120* to 150*F. The first is $17.99 and the other is $34.99.

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1981 300 SD 213k miles "Stock for now"
1999 Super Duty 7.3L 113k miles
1981 300 SD 180k miles "Heavily modified" SOLD