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ACDelco RC85 GM Original Equipment 15 P.S.I. Radiator Cap

by ACDelco
4.8 out of 5 stars 51 customer reviews

List Price: $15.47
Price: $10.22 & FREE Shipping on orders over $49. Details
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  • Enter your model number above to make sure this fits.
  • Seal and maintain pressure on the cooling system for vehicle safety
  • Raise the boiling point of the engine coolant to maintain efficiency
  • Fit most models of GM vehicles for expanded coverage
  • GM-recommended replacement part for your GM vehicle's original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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26 new from $7.70
Note: ACDelco partners with other manufacturers to supply the parts your car was originally built with. This product is in an ACDelco package, however the part may have been manufactured by an independent ACDelco supplier and could have a different color or shape than the product image above.
$10.22 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • ACDelco RC85 GM Original Equipment 15 P.S.I. Radiator Cap
  • +
  • ACDelco 15-11073 GM Original Equipment Engine Coolant Thermostat Housing
Total price: $38.68
Buy the selected items together


Product Information

Technical Details

Brand ACDelco
Item Weight 2.2 ounces
Product Dimensions 2.5 x 2.4 x 1.5 inches
Origin China
Item model number RC85
Manufacturer Part Number RC85
OEM Part Number 15042975

Additional Information

ASIN B000C9S78G
Customer Reviews
4.8 out of 5 stars 51 customer reviews

4.8 out of 5 stars
Best Sellers Rank #14,044 in Automotive (See top 100)
#15 in Automotive > Replacement Parts > Caps > Radiator Caps > Standard
#274 in Automotive > Replacement Parts > Engine Cooling & Climate Control
Shipping Weight 2.4 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available November 11, 2005

Warranty & Support

Warranty, Parts:12 Months / 12,000 Miles (Parts Only)Warranty, Labor:ACDelco offers a 12 Month / 12,000 mile warranty.

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From the Manufacturer



Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By E. Cansler on January 27, 2013
Verified Purchase
I can't complain about this radiator cap (yet), but I only selected it because it was the sole reasonably priced cap for my Grand Prix which had long been losing small amounts of engine coolant. When changing my coolant, I noticed that I could easily squeeze and compress the upper radiator hose with my hand, even when the engine was at operating temperature. Considering that the system is supposed to be pressurized at one atmosphere gauge pressure (according to the 15 psi printed on the cap) I realized that the system wasn't holding anywhere near its rated pressure. Crossing my fingers and hoping that it was merely the radiator cap instead of a leak somewhere, I ordered this. Turns out that I was right; now, when the engine is at operating temperature, the upper radiator hose feels more like an unopened Coke bottle when I squeeze it, like it should.

When I held the old cap up against the new and visually compared them, one thing stood out: the O-ring on the old was mashed flat. Now, I don't know exactly how these caps work, but I do know that O-rings are pretty cheap. If you're considering replacing your cap, think about measuring the O-ring size and just replacing that (would probably be no more than a dollar or two). My instinct says that that's the only thing wrong with my old one, but I can't say for certain.

I give the cap five stars for now, because I can't complain about it, and it was pretty cheap. But, if I still have the car in a few years and this cap goes bad, I'll be sure to update the review.
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Verified Purchase
Now this is a perfect example of how Awesome amazon can be. When we ordered our radiator it said that the cap did not come with it, so we ordered a cap. When the radiator came it had a cap. I contacted amazon and they said just keep the cap and we will deduct it from your credit card. What a class act. In case you are wondering it is a very nice cap and good quality so now I have an extra.
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Verified Purchase
Product arrived quickly and undamaged. It also fit properly as expected. (Note: 5-star means "you love it"...really? Its a car part.) So I also submit to you that I was satisfied with experience as that is more accurate.
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Verified Purchase
i own a 2006 trailblazer ss and the coolant was getting so hot that it started to boil after 15 minutes of driving. This part resolved the problem.
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Verified Purchase
Purchased to replaced the old cap on a 2008 Chevy Trailblazer (4.2L). The fit was good and there have been no issues after a few months of driving.
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Verified Purchase
This is a original equipment part that has proven itself for 10 years and 100k so for a couple of extar dollars to me it's worth the peace of mind.
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Verified Purchase
I put this on my '04 Impala in December of 2011. It stopped the slow leak and is still working just as it should. Great OEM buy from Amazon!
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Verified Purchase
This was the one that was on the vehicle that started to leak. I dont know how old it was, but this one went on and stopped the slow leak.
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