‘94 running cold.

[auttiman]

Would this be a symptom of a stuck open thermostat?

 

[BILT4ME]

Yes.

 

[Augustiron]

Yup, I just had this on my 96. It wasn't obvious until the colder weather came
I also started getting a CEL p0116 which is about the engine temperature sensor not moving enough in a specified range.
It was either a bad temp sensor or a stuck thermostat, since it took forever to heat up on the scan gauge and through the heat vents I knew it was the thermostat.

 

[Squash]

Make sure that the rad is full, this is damn easy, then the t-stat

 

[george_tlc]

Pretty likely the thermostat - had it happen on a trip in our '97. Picture below of new on the left and defective stuck open on the right. At least stuck open is better than stuck closed...

cheers,
george.

 

[Stiles]

Its worth giving your fan blades a spin with the motor off. They aughta move freely. My fan clutch went bad (blades didnt spin freely, rather they spun full speed w the engine), truck ran cold.

I swapped thermostat at same time.

 

[auttiman]

 

[BILT4ME]

Nn

Oo

 

[Malleus]