Thank you for your reply.
Ok, the first thing that should be checked is whether or not the electric cooling fan is coming on to cool the radiator. When the engine
is up to operating temperature, and the guge is around the 1/2 mark, the fan should kick in to maintain the correct temperatures.
We see a lot of fan motor failures on the PT's, so if your fan does not turn on, then you may need a new fan. Of course, testing all the fuses first is the best place to start in case the fan fuse has blown.
A second common issue we see with these models is leaking head gaskets. There is a chemical kit available from your parts outlet that will check for the presence of cmbustion gases in the cooling system. If these gases are present, then that would indicate a leak.
Alternatively, if you are dealing with a shop, they can apply compressed air to the engine cylinders and check for the presence of air bubbles in the cooling system and this also would inidicate a head gasket issue.
With a little bit more detective work, I am confident that one of these 2 things is going to be the most likely cause of your overheating concerns.
I wouldn't just jump in and throw a new water pump at it just for the sake of trying it. Unless it is leaking, or the 2 things I have mentioned are perfect.
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