Bad radiator cap?

[Drew99GT]

When I remove the cap on my mom's 07 Impala, I hear a rush of air and a few ounces of coolant flows from the radiator to the overflow bottle. Is that a sign of a bad cap? Everything else is normal and all the air is bled from the system after I drained and refilled the system a few weeks ago. This is with a stone cold engine.

Thanks!

 

[mechtech2]

I doubt you hear air. You hear coolant. Why do you think it is air?

Anyway, this is normal when opening a hot radiator.

 

[Drew99GT]

Yea, I guess it is coolant. I said this happens when the engine is completely cold. I wouldn't open a radiator cap on an engine that's hot.

 

[GMBoy]

That actually SHOWS the cap is working. It held pressure until you opened it. If the car is not overheating or running hotter than normal, it's fine.

If you want to replace it for safety sake, it is not an expensive part.

 

[Drew99GT]

Thanks GMBoy; I've never had a vehicle do this but I guess all is well. Thanks for your help previously with questions about our 07 Impala.

 

[GMBoy]

Originally Posted By: Drew99GT
Thanks GMBoy; I've never had a vehicle do this but I guess all is well. Thanks for your help previously with questions about our 07 Impala.



You are so welcome. Anytime.

 

[Ramblin Fever]

My rodeo does this too, always feel bad for doing it as I know I've broken an otherwise excellent seal.