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GM Genuine Parts 21649 Radiator

4.5 4.5 out of 5 stars 100 ratings

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Purchase options and add-ons

  • Lightweight; the radiators have a positive heat transfer to weight ratio
  • Corrosion-resistant aluminum designed core helps optimize the radiators long lasting
  • 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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From the manufacturer

Certainty Starts Here

THREE TIERS OF A PREMIUM PORTFOLIO

GM OE

ACDelco Gold

ACDelco Silver

GM ORIGINAL EQUIPMENT

GM Genuine Parts and ACDelco Original Equipment are the true OE parts installed during production or validated by General Motors for GM vehicles. These maintenance, repair, powertrain and collision components are designed and engineered to meet rigorous standards set by General Motors.

GOLD

ACDelco Gold parts are the high-quality alternative to OE parts. These parts are manufactured to meet expectations for fit, form and function, making them a smart choice for General Motors vehicles and many makes and models, including special applications.

SILVER

ACDelco Silver parts are high-quality, high-value options for General Motors vehicles, as well as for most makes and models.

Our History

OUR HISTORY – OUR ROOTS EMPOWER US

ACDelco has been at the forefront of automotive innovation since the birth of GM in 1908. Since then, we’ve helped a woman fly around the world and a man traverse the surface of the moon.

However, our history isn’t half as promising as our future. We continue forward with GM Genuine Parts by our side. From the assembly line to the finish line, we’re building innovation and improvement on a foundation of GM Original Equipment.

GM Genuine Parts and ACDelco are proud to work together as the only source for true General Motors Original Equipment and aftermarket parts – past, present and future.

Product Description

ACDelco GM Original Equipment Radiators are GM-recommended replacements for your vehicles original components. Radiators are heat exchangers, typically located in the front of the vehicle where air can flow through the fins and dissipate heat. Modern radiators are made from aluminum and plastic, while older vehicles used copper and brass. These radiators are designed to be corrosion resistant with optimal heat transfer characteristics. These original equipment radiators have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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GM Genuine Parts 21649 Radiator


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What's in the box

  • Radiator
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    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    100 global ratings

    Customers say

    Customers like the quality and performance of the heat sink. For example, they say it's well-made and works great. They're also satisfied with the fit and value. That said, some complain about the damage and lack of a drain valve. Opinions are mixed on leakage.

    AI-generated from the text of customer reviews

    13 customers mention13 positive0 negative

    Customers are satisfied with the fit of the heat sink. They mention that it fits perfectly, and the oil and transmission cooler lines fit right without adaptors.

    "Fit well and was a great itemWould buy again for other cars I own" Read more

    "Well made product that fit perfectly in my Yukon. Fast Delivery without any damage to the fins." Read more

    "Good fit...working so far with no leaks. doesn't have drain valve ...but looks of good quality." Read more

    "FIT LIKE A GLOVE ,ALITTLE TIME TO PULL THE OLD ONE OUT ,BUT THE NEW ONE WAS EASER TO INSTALL" Read more

    6 customers mention6 positive0 negative

    Customers are satisfied with the quality of the heat sink. They mention it's well made, excellent, and a great OEM replacement.

    "Well made product that fit perfectly in my Yukon. Fast Delivery without any damage to the fins." Read more

    "...doesn't have drain valve ...but looks of good quality." Read more

    "Very please with the price and the overall build quality of the product...." Read more

    "Great OEM replacement. My 2004 Denali has 180K miles and after putting a new water pump on it started leaking at the seams on the radiator...." Read more

    5 customers mention5 positive0 negative

    Customers are satisfied with the performance of the heat sink. They mention that it works great and is easy to install.

    "Everything was flawless in swapping this new radiator out, in an '04 silverado" Read more

    "...So I bought this replacement and it works great." Read more

    "Original radiator what else could you ask for. Updated version. Working as designed." Read more

    "2004 sierra denali quadrasteer. Slipped right in. Works perfect." Read more

    4 customers mention4 positive0 negative

    Customers appreciate the value of the heat sink. They mention that it has a great price.

    "...I would probably have given a 5* as the product is OEM and pricing is good." Read more

    "...Radiator was double-boxed and packed securely. Price was way less (<$200) than local part stores for cheap aftermarket units." Read more

    "...Hope to get another 15 years with this one. Great price." Read more

    "Great value, genuine ACDelco..." Read more

    3 customers mention3 positive0 negative

    Customers find the installation process of the heat sink to be easy.

    "...GLOVE ,ALITTLE TIME TO PULL THE OLD ONE OUT ,BUT THE NEW ONE WAS EASER TO INSTALL" Read more

    "Radiator fit my 2001 Chevy Silverado 2500 HD 4x4 just perfect! Installation was easy if you have any mechanical ability at all...." Read more

    "easy to install and worked great." Read more

    6 customers mention3 positive3 negative

    Customers are mixed about the leakage of the heat sink. Some mention that there are no leaks from any of the oil fittings, while others say that it leaks.

    "Good fit...working so far with no leaks. doesn't have drain valve ...but looks of good quality." Read more

    "...But then as I filled the system with more coolant another leak appeared near the top of the drivers side tank right below the top hose neck...." Read more

    "...some of the fins in the center were bent over completely flat but did not leak...." Read more

    "...has 180K miles and after putting a new water pump on it started leaking at the seams on the radiator...." Read more

    6 customers mention0 positive6 negative

    Customers are dissatisfied with the drain of the heat sink. They mention that it does not have a petcock valve, and the plugs do not line up.

    "Good fit...working so far with no leaks. doesn't have drain valve ...but looks of good quality." Read more

    "Not clear that there is no drain plug." Read more

    "Great fit as factory replacement but does not have a fluid drain pet cock like the original factory radiator did...." Read more

    "It’s exactly what I ordered but I was disappointed to see no drain plug. It was also packaged very poorly...." Read more

    5 customers mention0 positive5 negative

    Customers are dissatisfied with the damage of the heat sink. They mention that the box was bruised, ripped on one end, and some of the fins in the center were bent. This leaves the delicate middle exposed to potential damage. Some customers also report that the fans were dented.

    "Packaged well, though a couple of the fans were dented, but I can get over that considering the price compared to the dealership" Read more

    "...Just destroyed. The second one the box was bruised in one spot. They need to add a piece of cardboard to both sides of the core for shipping." Read more

    "...Only dislike is the way it's packaged. The box was ripped on one end and some of the fins in the center were bent over completely flat but did not..." Read more

    "...Simple swap out. Did come with a couple minor bent fins. Understandable when dealing with flimsy cooling fins on radiators." Read more

    Can't beat the price
    5 Stars
    Can't beat the price
    The first one I received I think a Hockey Goalie used it as a chest protector first. The second one was a lot better but I still spent a half hour straitening fins. The first one was the shippers fault. Just destroyed. The second one the box was bruised in one spot. They need to add a piece of cardboard to both sides of the core for shipping.
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    Top reviews from the United States

    Reviewed in the United States on January 7, 2024
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    Reviewed in the United States on March 29, 2023
    Reviewed in the United States on November 11, 2019
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    5.0 out of 5 stars Can't beat the price
    Reviewed in the United States on November 11, 2019
    The first one I received I think a Hockey Goalie used it as a chest protector first. The second one was a lot better but I still spent a half hour straitening fins. The first one was the shippers fault. Just destroyed. The second one the box was bruised in one spot. They need to add a piece of cardboard to both sides of the core for shipping.
    Images in this review
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    Customer imageCustomer image
    Reviewed in the United States on October 24, 2019
    Reviewed in the United States on May 1, 2019
    Reviewed in the United States on February 7, 2020
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