Over Heating Pulling a Grade on 2001 Kia Sportage

I replaced the radiator,stat,cap,and fan cluch twice.The motor will get a little warm but not over heat. Then wen I tunh the motor off It boils over. It has over 150,000 miles,It is a automatic and runs very well.

Asked by for the 2001 Kia Sportage
Make sure you have good air flow across the rad from the a/c condensor in front of it. Clogging of fins can cause the problem of no flow to the rad. Since has overheated make sure to have head gasket checked for possible start of failure. How is the weather there? I used to live up the mountain in Paradise.