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🚗 Lock in peak engine performance with the GM-approved radiator cap everyone’s upgrading to!
The ACDelco GM Original Equipment RC27 Radiator Fill Cap is a premium, vehicle-specific replacement part designed to seal and pressurize your GM vehicle’s cooling system. Manufactured to meet OEM standards, it ensures a perfect fit and reliable performance across most GM cars, SUVs, and trucks. Built with durable plastic and metal materials, this radiator cap helps maintain optimal engine temperature and comes with a 24-month unlimited mile warranty, making it the trusted choice for professional-grade cooling system maintenance.





| ASIN | B000C9SP4W |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #16,496 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Replacement Radiator Standard |
| Brand | ACDelco |
| Brand Name | ACDelco |
| Closure Type | Twist-On |
| Color | Silver |
| Compatible with Vehicle Type | Car,Suv,Truck |
| Customer Reviews | 4.6 out of 5 stars 1,976 Reviews |
| Exterior Finish | Machined |
| Global Trade Identification Number | 00036666946543 |
| Included Components | 10409635 |
| Item Dimensions | 2.5 x 2.4 x 1.5 inches |
| Item Type Name | CAP,RAD FIL |
| Item Weight | 1.6 ounces |
| Item dimensions L x W x H | 2.5 x 2.4 x 1.5 inches |
| Manufacturer | AC Delco |
| Manufacturer Part Number | 10409635 |
| Manufacturer Warranty Description | 24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details. |
| Material | Plastic Metal |
| Material Type | Plastic Metal |
| Model Number | RC27 |
| Number of Items | 1 |
| OEM Equivalent Part Number | 10409635 |
| Style Name | Professional |
| UPC | 036666946543 |
| Unit Count | 1 Count |
| Vehicle Service Type | Car,Suv,Truck |
M**C
perfect fit, exactly what I needed
Got this for my truck and it fits perfectly, feels exactly like the factory part should with no wobble or weirdness. OEM GM parts are usually a safe bet and this one is no different, solid construction and it seals up nicely. Ships quickly and comes well packaged so it shows up in good shape without any damage. If your current cap is giving you trouble just grab the ACDelco replacement and call it a day.
H**Y
Seems functional
Fits well and does the job. It looks nice also.
C**N
Looks and works like my Firebird's OEM radiator cap, rather than the aftermarket cap it replaced
I found the same cap at a lot of car parts web sites, but this had the best price, and with Prime, fast shipping at no extra charges. My 81 Trans Am had been giving me a lot of check engine lights, and in retrospect, probably because of overheating, even though with the previous cap, the water temp gauge never went over 220. After I installed this cap, and a few cycles between hot and cold, the check engine light doesn't come on anymore, so the engine isn't overheating. (It never overheated enough to blow steam, though). My T/A came from the factory without A/C, so it has the non-A/C radiator. I added a Vintage Air A/C system. With it off, the water temp stays at 220, but with the new cap, and the AC on, the temp goes up really high, but I don't get check engine lights. I think the old cap wasn't holding pressure, and the water in the block was turning to steam, which doesn't transfer heat very well. The new cap holds pressure, the water doesn't turn to steam, so the water carries more heat, and the temp gauge reads higher. I have a now unavailable flex radiator fan, and when the A/C is off, the water temp cools down quickly. I have a polished aluminum Cold Case radiator which will replace the OEM radiator. That should be the last piece of the overheating puzzle.
N**Y
Old Truck
It fits perfect exactly what the old 88 Chevy truck needed!!!
P**Y
Fits 1978 Corvette
Fits 1978 Corvette perfectly. Country of Origin: India
T**R
Need product fast
Very easy to use
J**S
Good radiator cap
It’s AC Delco! Of course it’s good
B**1
Good as the original
Worked well. This fit my 442 perfect.
I**.
Sehr gut
Schnelle Lieferung
J**O
O produto é de ótima qualidade, e a entrega foi antes do prazo previsto.
ADOREI O PRODUTO, É DE OTIMA QUALIDADE DO MATERIAL FOI SÓ COLOCAR E ESTA FUNCIONANDO MUITO BEM.
S**G
Excelente calidad
Perfecto para mi chevrolet c1500, 1990 4.3lt
R**D
Fit
Fit for my gmc Sonoma 1995
E**E
As described
As described
Trustpilot
1 month ago
1 day ago