My 2001 pt cruiser limited over heated. It has already had a new radiator and both fans replaced with in the year. Should i now replace the water pump which is the original?

did you replace the water pump the 2.0L or 2.4L the water pump is driven off the timing belt

probably not . There are fuses to check and a relay to check as well as the coolant temperature sensor to check . If the engine overheats when you have the heater on it suggests an air lock in the cooling system . Have the system pressure bled along with all the other checks.

See if the compressor clutch engages, check that the inner parts of the belt pulley turns together with the outer part/ belt. If not the clutch circuit or the pressure sensor connector on the pressure tube may have been disconnected during the change of the water pump. Or maybe you just run out of refridgerant? Low pressure --> the compressor runs constantly but no or little cooling effect.

Faulty water pump is the next thing I'd check.
Also backflush the cooling system if you haven't already.
Check to see if you have coolant in the oil. You may have a bad head gasket.

check if engine fan is turning on and off...could also be ahead gasket leaking

the t-stat could be stuck or possibly an air lock

water pump ,its a plastic impeller and its loose on the shaft ,,,,,had one a while ago exactly the same but the first time i came across this on a saab i done the same as you ,changed everything ,felt a right you know what

did you check the fluid level by removing the rad. cap? Radiator should be full to top. If Chryslers are low on coolant, the heater will not blow warm air.

I also own a 2001 pt cruiser and i am currently having to same problem. We have found that it maybe the radiator is clogged up or is clogging. This may possibly cause your radiator to crack ( mine has) . If you find an answer please post the solution.

Thanks