A good friend called me up asking to put a thermostat in his 1991 S-10 w/2.5 and 5 speed. It would'nt heat up enough to make good heat. So I put in a 195 degree T-stat, and road test. No difference, the guauge will move about a eighth of a inch off the 100 degree mark and stay there.

Outside temp is about 10 - 15F

Even in the summertime, the truck hardly warms up. Only time is reaches normal range is idleing in traffic with the A/C on.

Any suggestions?

Thanks all

Are you talking about actual verified tempertature with a separate mechanical gauge? If you're just going by the factory electronic dash gauge-forget it. They are all junk. Temp is probably fine-gauge just doesn't show it.

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'93 1/2-ton Cheyenne 2wd
408" smallblock with vortec heads, 9.2:1 CR, Performer Intake, 454 TBI, Comp Cams XE268H cam, custom chip, Thorley headers/true dual exhaust. 375-400 HP. 4L60E w/ Trans-go kit.