Originally Posted By: paulo57509
I'd go with either OEM, Gates or Stant. Not necessarily in that order.
I just received an ACDelco cap I ordered from Rock Auto (P/N 12R9 for the Lumina). The box reads, "Made in Israel".
However, I believe it's defective. The little, spring loaded valve that opens to allow coolant flow back into the radiator from the over flow is just dangling there. No spring tension.
I don't think the cap will hold pressure with the valve like this. If I could only remember where I put my cooling system tester.....
FWIW, I found my tester and the cap does hold its rated pressure (16psi).
I don't know who manufactured this cap. No other markings besides ACDelco and country of origin. The label does have a date code of 2014-06-24 so I doubt that it came from Delphi. GM sold off Delphi way before this date.
Ah-ha! The label does have T16V on it which is a Standard Motorad P/N. However, it does have ACDelco stamped on the cap.