rad fans work fine. when i stop it sounds like a small plane under the hood until my car cools down.

would my car be able to cool down so quickly when i come to a stop if the pump was bad or the rad was plugged? i don't know. that is what wierds me out. i will check those things out though.

would a stuck or partially stuck heat riser valve or a bad cat cause my problem?

let me know what you think , please.