replaced the ac compressor dryer and offer tube toped off antifreez. why does it run hot with my ac on and when its off it doesnt
replaced thermo and waterpmp why does it run hot? on 1999 Cadillac DeVille
ck coolant level again and then ck aux cooling fan operation
2 more answers
When you say it runs hot, at what temperature is it running at? Are you seeing the temperature on the gauge or did you measure the actual temperature at the thermostat?
check aroud your top radiator hose, see if there is a bleeder valve for bleeding outair in your cooling system, if air is traped in system the engine will over heat