Cooling System Diagnosis

[Stocker]

Originally Posted by sjarrett71

The temp sensor is located in the rear of the head on the passenger side.

Originally Posted by DesertCat

Sender in the head is not the ideal location, I prefer on the intake manifold.

Any chance that the sender & gauge are working correctly? Maybe that area of the head naturally gets hotter before the thermostat opens -- then the circulating coolant brings the temp down to normal.