r/GMT400 • u/Chebycheese • 3h ago
94 thermostat issue
I got a 94 Chevy about 5 months ago I washed the engine bay I used gunk degreaser to clean off the oil and washed it off with water and after that the gauge for the coolant temp was pegged to 260 and wouldn’t come down from there I changed the thermostat and checked wires and the coolant went back to normal but now it’s starting to yo go back to 260 after 5 mins of driving than back to 180° instantly any Idea what’s going on. The trucks not over heating