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Has the system been flushed? Correct temperature thermostat installed? Are you getting flow through the radiator? Rad cap sealing properly and is it the correct one? Are the fans actually coming on? Is the temp sensor working properly? Rad properly filled or still have air trapped inside? Water level correct? Water pump working or seized, leaking?
1. Make sure it is full of coolant 2.Be sure all belts are not slipping and tight and the electric fan is operating 3.Change thermostat 4.Flush radiator
Ensure coolant system has been properly filled.
Carry out all air bleed operations as specified by the manufacturer- (don't forget to open the heater core supply valve).
Flush rad & change coolant & thermostat. Check operation of rad fan, & make sure it is coming on when engine reaches normal operating temperature. Be sure to bleed air out good when refilling rad/cooling system. Start engine & turn heater on when refilling & let rad fan come on & off at least 2 or 3 times before putting cap back on rad, and refill rad as needed as you do this. then fill return bottle to proper level & see what happens.
You may want to service the cooling system if it has never been done before. The thermostat may have gone bad and needs to be replaced if it has never been replaced since the PT is 6 years old. After changing the thermostat flush out the old antifreeze and replace with new antifreeze with a mixture of 50/50 antifreeze/water. straight water will boil and steam out and straight antifreeze will over heat since it does not have the same heat transfer as water that's why your mix them 50/50. Old antifreeze will have a higher antifreeze concentration since the water will evaporate. Good luck and hope this helps, keep me posted. Be glad to help.
A couple of things. Simplist is to flush & refill the radiator. Collant level could be low. Mine was doing it mainly when stopped a lights or at idle speeds. If I reved the engine around 2,ooo RPM, it produced heat. Once I flushed and refilled the cooling system, problem went away. Good luck!
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