Engine runs hot and noisy after replacing water pump, hear sensor and thermostat?

2004 PONTIAC GRAND PRIX

220,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC

CLIFTON STOVALL SR.

MEMBER
1 POST

Installed new water pump, heat sensor and thermostat.. Was a lot of rust in radiator. Temperature hand goes above normal but doesn't run hot. Loud noise when i stop at stop sign or when i slow to make a turn but never hear it while driving... Do i need to flush my radiator?

Sep 15, 2021 at 8:39 AM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Good afternoon,

Yes, you do. You need to get all the rust out of the system as that rust may be clogging the cores in the radiator itself.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

A simple flush may not take care of it. You may need a shop to do an acid flush where they use an acid-based flush and force it through the radiator.

In the worse case, the radiator would have to be replaced to get the circulation back.

https://www.2carpros.com/articles/how-to-replace-a-car-radiator

Let us know if you have any other questions.

Roy

Images (Click to enlarge)