Engine gets hot and fluid comes out of the reservoir.Doesnt happen all the time.

Is the cooling fan operating correctly (at the right temperature)? Does it only happen under load (perhaps a restricted radiator core or mildly blown head gasket.

Pt Cruisers are will known for restricted radiators. I had a customer come to me after he replaced every thing in the cooling system except the radiator. I used a power flush gun to flush the cooling system. It is very expensive to replace the radiator in that car. I told the customer if the power flush of the cooling system did not fix it we would have to replace the radiator. Guess what it fix the problem. DO NOT CONTINUE TO DRIVE THE CAR. If you do not address the problem you will be putting a head gasket on the engine or worse.