ACDelco GM OEM RC81 15 PSI Radiator Cap Review

Does not fit my aluminum radiator. The old one that was part of GM was a perfect fit. It's not part of GM, no matter how hard they try. China Ching Chang Wan. Sent back stay away.

Works great. Does exactly what it says. Bought these to replace some old caps with outdated seals. Although they are RC81 they are the same as RC33 and were actually marked RC33 on the actual caps.

Nice looking part but when used with an aftermarket aluminum radiator like my ColdCase it is almost impossible to remove once it snaps into place. I had to use giant pliers to lock the channel at the edge and push hard to get through the bayonet locks. I ended up buying a quality Stant #16 vented cap and it turns on and off as it should.

Easy and inexpensive coolant leak repair. I always had to top up coolant. I even removed my coolant expansion tank and checked for leaks - there weren't any. But I keep losing coolant. A video by Scotty Kilmer (YouTube Auto Mechanic) recommends always checking the radiator cap when coolant is leaking. This new cap is in place - no coolant has been lost since! THANKS!

I wanted an exact replacement for my old 1973 Chevy C20 5.7 350. I have seen many caps advertised as 16psi instead of the factory 15psi that the on my original RC33 are lids. Does a PSI matter? Probably not, but it gives me confidence that it's the right thing to do. I would also like to mention that the original RC33 caps are no longer made. You will not buy a replacement that looks exactly the same. These caps are actually stamped RC33 but have a sealed insert in the cap. This is as close as…