This replacement radiator is just what you need to get your GM mid size vehicle in working order again. This radiator feature these great qualities:

  • Has cooler for automatic transmission
  • Has cooler for engine oil (EOC)
  • Direct replacement
  • Built to strict quality control specifications
  • Engineered for optimum heat-transfer performance and fit
  • 100% tested prior to leaving factory
  • Proper fittings for transmission lines (if needed)
  • Fits vehicles with 4.3L engine

This radiator makes a great replacement and has substantial cost savings over a dealer radiator.


Construction Note:

Due to new advances in radiator design and technology, this radiator may be constructed from materials that are different from your original. If so, the radiator will still fit and function properly but will be more efficient in cooling.


Radiators may incur bent cooling fins or small imperfections during shipping or manufacturing. A few bent fins or small dents and scratches do not affect the fit or the function of the part. Neither our 60 Day satisfaction guarantee, nor the manufacturer's warranty, cover these types of insignificant damages.

Transmission Cooler Note:

Some radiators are designed to be used on both automatic and manual transmission applications. These radiator may have fittings for an automatic transmission fluid cooler. However these radiators can be used on manual transmission models without issue and require no additional parts or modifications.

Direct Fit Replacement

Core thickness equal to the OE part.  If radiator core is slightly thinner than the OEM, this can decrease overall performance and lifespan.

Premium Aluminum Core

Engineered for top performance.  Provides efficient cooling and heat-transfer.

100% Leak Tested

Built to strict quality control standards.

Part Details

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Disconnect the battery (1:45)
    • Use an 8 mm wrench to disconnect the negative battery terminal
  2. step : Remove the fan shroud (2:00)
    • Remove the seven 10 mm bolts using a socket, ratchet and extension.
    • Pull the shroud up and out.
  3. step : Install the new radiator (3:00)
    • Double check that everything connects the same way before installation.
    • Drain the radiator by placing a drain pain under the radiator drain.
    • Remove the skid plate by remove the six 15 mm bolts, remove them with a socket and ratchet.
    • Release the petcock to drain the radiator fluid.
    • Disconnect the radiator hoses and the oil cooler and transmission cooler lines.
    • Use an adjustable wrench and 19 mm socket and ratchet to do this.
  4. step : Install the new radiator (7:35)
    • Put the radiator into place
    • Connect all the lines and hoses
    • Do all this with your adjustable wrench and 19 mm socket and ratchet.
    • Fill with radiator fluid.
    • Turn the truck on and run it to check for leaks.
  5. step : Install the fan shroud and skid plate (10:30)
    • Bolt in the seven 10 mm bolts and six 15 mm bolts with your sockets, ratchet and extensions.

Tools needed for replacement:

    General Tools

  • Drain Pan

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers
  • Adjustable Wrench

  • Ratchets & Related

  • Socket Extensions
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket
  • 15mm Socket

  • Wrenches - Metric

  • 8mm Wrench

5.0 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Radiator for Chevrolet Blazer
Very happy with purchase of the new radiator. Well packaged and arrived in prefect condition. Fit exactly like the original OEM radiator. Will buy all my parts from now on from 1A Auto.
Thank you.
May 11, 2018
4 months ago
Perfect fit
ThIs radiator is just like the factory original. And it even came with new fittings. Very well worth the price. I have purchased from 1AAuto a few times before and will continue to do business with them. Great quality parts at very reasonable prices
April 14, 2018
4 months ago
Fits perfectly
Fits perfectly, just as if it were made for my 2002 Blazer. Maybe because it was. Slid in with no problems, everything lined up. Even had new fittings. No leaks. The videos were clear and let you know even what tools your going to need, nice touch. Just wish whoever designes radiators would put the drain in the middle where you can actually get to it with big hands,and the fluid could flow into your catch bucket instead of on the frame splattering everywhere. Not the fault of 1AAUTO, just a pet pive of mine.
February 18, 2018
6 months ago
Everything is working great I will definitely be making more purchases from 1 a auto in the future
October 17, 2017
10 months ago
Radiator order
Needed a radiator. Called auto places in town. $120-$130. Also would have to order. Looked online and found one for $85 from1A Auto. Had it in three days. Excellent price and service. Had installed in hour. MY NEW AUTO PARTS STORE!!!!!!!!!
May 22, 2017
1 year ago
Perfect for my S10
So far so good. Fit great, works great. No more leaks.
February 17, 2017
1 year ago
very happy
The price was right. This shipping was quick. All the parts I needed to make the swap were there, except for the coolant obviosuly. Doesn't get much simpler.
February 12, 2017
1 year ago
it is what i ordered and it works
I have tried other radiators and they have always disappointed me. but your radiator was the best. It fits like a glove and it works

January 22, 2017
1 year ago
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Browse 1 question Browse 1 question and 1 answer
Will this radiator fit my 2003 Chevy blazer extreme?
Thomas B on Jul 11, 2018
BEST ANSWER: Yes, provided it has a 4.3L engine.

Vehicle Fit

  • 1996-2004 Chevy Blazer S10 Radiator with Engine Oil Cooler
  • 1996-2004 Chevy S10 Pickup Radiator with Engine Oil Cooler V6 4.3L
  • 1998-2000 GMC Envoy Radiator with Engine Oil Cooler V6 4.3L
  • 1996-2001 GMC Jimmy S-15 Radiator with Engine Oil Cooler
  • 1996-2004 GMC S-15 Sonoma Radiator with Engine Oil Cooler V6 4.3L
  • 1997-2000 Isuzu Hombre Radiator with Engine Oil Cooler V6 4.3L
  • 1996-2001 Olds Bravada Radiator with Engine Oil Cooler

This part replaces:

  • Spectra Premium Industries CU1826
  • Partslink GM3010227
  • TYC 1826
Part #: 1ARAD00617

Order must be placed by 4pm ET

How-to Video:

(11:05 min)