My pt 2005 is starting to over heating

Not much to go on, all I can suggest is to check the hoses (make sure none of them have collapsed), check the coolant fluid level, replace the radiator cap (should be done every two years), then you'll have to start troubleshooting, starting with the thermostat, (http://www.wikihow.com/Tell-if-Your-Car's-Thermostat-Is-Stuck-Closed), water pump (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-water-pump). After that you may have to test for hydrocarbons in the coolant, a sign of a failing head gasket (try Napa's Block Tester).