The GMC CCKW

Posted: **Fri Feb 02, 2007 4:27 pm**

.Here in Brazil we have only two cases:1)In Summer...."OFF" position.2)In Winter,Spring and Fall...."Middle" position[/b].

Good Luck.

Posted: **Fri Feb 02, 2007 6:19 pm**

Run it in the Summer Off position

Exhaust Manifold Heat Valve Control.