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It seems some people have a problem with air pockets when filling the closed cooling system. A seemingly good way to burp the system is to park the truck nose down (or jack up the rear) and remove the coolant temp sensor until coolant comes out. The sensor is located in the head next to the valve cover, driver side near the firewall. It has one single wire coming from it.

 

Warning: some people have broken the sensor trying to remove it when it was rust welded in place.

 

I myself remove the thermostat housing end of the upper radiator hose and fill the system through the hose. Never had a problem doing it that way.

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