Hi i have a 92 C1500.. I drove it home from work tonight and everything worked great!! I went inside to change and left to go to walmart. On my way there everything was just fine and then the temp gauge would randomly fly up past any reading and the CHECK GAUGE light would go on. Then it would go back to normal readings at times then and it would shoot back up again. WHY IS THIS DOING THIS!!!!!!!!!!!

HELP ME!!

THANK
RYAN

because you have a bad thermostat.