Hello! I've been scratching my head on a 2007 pt cruiser that originally came to me because it intermittently overheated, I replaced the thermostat with a fail proof stat, and manually operated the fans on both speeds with my computer to check them, it worked good for several weeks but now my customer says it intermittently overheats, and runs ice cold some times, I'm leaning toward the ECT sensor but I'm not 100%, and ideas? Thanks in advance

 

is the car physically over heating or just what a gauges says you need to see it first.

 

. The car is deffinetly overheating, the overflow boils over when it happens, and when the car is running cold, the vents blow ice cold in the car.

 

thats a lack of coolant or the water pump is not moving the coolant around.

 

Sorry it took so long, but tonight I drained the coolant, put in another new thermostat, and replaced the coolant temp switch, and added all new coolant, used the bleeder when filling, ran it , and double checked the fans were working properly. They are going to run it for the week and let me know of any issues