Im not sure whats going on, it doesnt seem like my car is overheating, but everytime i add extra load at idle, like turn on the heater or the head lights, my temp gauge goes up. Normally at idle with the lights and heater on it sits at about 1/3, but since yesterday it will sit at 1/3 but if i turn on the headlights and heater it will go up to 1/2, could this be like a ground wire problem or something? I did some work on my car yesterday, and im thinking i may have left one of the ground wires off. thanks in advance

 

anyone?