Setup

• Drive your PT up on a set of blocks and allow the engine to cool. This helps avoid burns both from touching the exhaust and by opening the coolant valve. Pop the hood of the PT and remove the negative battery cable from its terminal, then locate the radiator petcock valve at the base of the radiator. Turn the petcock counterclockwise and be sure to have a catch container below the valve. Allow the coolant to drain out and unscrew the top cap of the radiator to make sure that all of the coolant drains.
  
  

Remove Old Hoses

• Begin removing each one of the old hoses in the current cooling system. Use a screwdriver or a nut driver to loosen the mounting screw on each of the hose clamps and slide the clamp off the hose. Pull on either side of the hose to remove it from the lip of each mounting coupling on each part of the engine. Be sure to have a catch pan under each hose as you remove it as it will inevitably have a little bit of coolant left in it. Remove all of the hoses and compare them to the new hoses that your purchased for the PT Cruiser.
  
  

Install New Hoses

• Slide the end of each of the new hoses over the lip of the coolant couplings leading away from the radiator and into the engine. Place hose clamps at each end of the hose to secure it in place, being careful not to pinch the hose as this could cause a leak or a hole. Fill the radiator with a 50/50 mixture of coolant fluid and water. Turn the Cruiser on and allow it to warm up. As the car runs, the fluid should begin to circulate and remove any air pockets that are left. Continue to pour in a mixture of water and coolant until the overflow reservoir of the PT Cruiser fills to the "Full" level specified on the side of the reservoir tank.