Overheating

[Jackyl9999]

New member here. I was unable to find the search so I'll just ask the question.


Yesterday I was driving home, 40 degrees out. I had the heat off in the truck and was cruising about 45-50 mph. I looked at my gauges and my temp gauge was climbing pretty steady. It maxed out and the "check gauges" light came on. I turned the heat on and the gauge dropped pretty quickly. I got home and nothing was overflowing, steaming ,etc.


What could cause this?


Truck is a 1990 K1500 350/5 speed Project truck that I bought to drive thru the winter.

 

[thz71]

Passenger side floorboard wet? Radiator full? Any leaks?

 

[Jackyl9999]

Floorboard is dry.
No leaks that I can see.
Radiator was a little low. I topped it off, but the previous owner said the radiator was brand new so it may have not been filled when replaced.

 

[Johnbalderas90k1500]

Refill the radiator and try to rid the system of air pockets.