Product ReviewsRadiator Cap ACDelco RC27

A Good Radiator Cap

I was having problems with brown gunk getting under radiator cap and the fluid wouldn't stay to the top of the filler tube. Replaced the venting cap I had on there with this cap that is recommended for Pontiac Grand Prix and it fixed my problem. No more brown gunk and the fluid is right to the top and is clear.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: 123autoparts-1

OEM ACDelco Radiator Cap Part # 10409635

After this radiator cap was used to replace an aftermarket radiator cap on my 2000 Gran Prix GTP, the stability of the engine operating temperature improved considerably.

Verified purchase:  Yes | Condition: new | Sold by: overstockdirectus

Something wrong

Wouldn't fit, Sent a plastic covered version, not as pictured. No matter how hard you push down and turn, it won't clamp both sides. No spring inter-action when push down....Shorter end to cap.

Verified purchase:  Yes | Condition: new | Sold by: uaintl-2008

OEM parts

Good price for original part

Perfect fit!

Perfect fit! Autozone & O'Rileys couldn't find in there inventories!

Verified purchase:  Yes | Condition: new | Sold by: overstockdirectus

Very Nice New GM#10409635 Radiator Cap. It is made in India, but it works very well !!!

Verified purchase:  Yes | Condition: new | Sold by: cencalpartslingers

As described

It's a radiator cap, nothing special. OEM, bought it to replace the ugly cap on my restoration project.

Verified purchase:  Yes | Condition: new | Sold by: hga_performance

Perfect fit for a classic

Love the OEM stuff

Verified purchase:  Yes | Condition: new | Sold by: overstockdirectus

Replacement Radiator Cap

Fit perfectly - as good or better than the OEM part.

OEM Radiator Cap

Perfect fit and the cooling system is back to working properly.

Verified purchase:  Yes | Condition: new | Sold by: overstockdirectus