2004-07 Cadillac CTS Radiator - 1ARAD00950

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How-To & Tools
Product Reviews
Vehicle Fit


  • Direct replacement
  • Plastic tanks with aluminum core
  • Dimensions:
    • Height: 16 3/4"
    • Width: 26"
    • Thickness: 15/16"
  • Built to strict quality control standards



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.

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.

Item Condition: New

Attention California Customers:

WARNING: Cancer and Reproductive Harm -

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 : Removing the Splash Shield (1:05)
    • Remove the clips from the splash shield with a flat blade screwdriver
    • Pull out the four clips with a pair of pliers
    • Remove the splash shield
  2. step : Draining the Radiator (2:14)
    • Drain the radiator if you have a drain plug
    • Otherwise, place a drain pan below the lower radiator hose, and disconnect the radiator hose
  3. step : Disconnecting the Air Intake (2:48)
    • Remove the oil fill cap
    • Remove the engine cover
    • Install the oil fill cap
    • Loosen the air intake hose clamp from the throttle body
    • Disconnect the MAF sensor wiring harness
    • Disconnect the PCV breather at the back of the intake tube
    • Loosen the two air box screws with a flat blade screwdriver
    • Pull back and release the air box from its clips
    • Remove the air filter
    • Pull the air intake runner up and out
  4. step : Removing the Radiator Fan (4:06)
    • Release the fan's electrical connector
    • Pop the clip out holding the harness to the fan shroud
    • Repeat the process for the other side
    • Remove the three 10mm bolts holding the air box in the engine bay
    • Remove the air box
    • Remove the insulation under the air box
    • Remove the Phillips head screw from the side of the fan shroud
    • Remove the three 10mm bolts from the top of the radiator fans
    • Disconnect the retainer from the wiring harness on the passenger side of the fan shroud
    • Lift and pull to release the fan shroud from its lower retainers
    • Remove the fan shroud
  5. step : Disconnecting the Lines (6:02)
    • Disconnect the transmission cooler lines on the bottom of the radiator with GM tool J44827 by following Step 6
    • If you do not have access to a special tool, remove the lines with a screw style hose clamp
    • Undo the clamp with a flat blade screwdriver
    • Open the clamp
    • Cut the screw end off with side cutters
    • Wrap the clamp around the hose
    • Leave a small gap between the two pieces and cut off the excess
    • Round the clamp around the line
    • Push the line fully in
    • Squeeze the gap bend
    • Push it into place
    • Pull the line out
    • Drain the line
    • Repeat the process for the other side
    • Drain the line
    • Skip to step 7
  6. step : Disconnecting the Lines (8:53)
    • To disconnect the transmission cooler lines, press the GM tool to the line and snap it around
    • Push the line in
    • Insert the tool into the gap
    • Remove the fitting from the cooler
    • Let the line drain
    • Repeat the process on the other side
  7. step : Removing the Radiator (9:37)
    • Remove the two 10mm bolts securing the A/C condenser to the front of the radiator
    • Remove the 10mm bolt securing the transmission cooler line to the front lower part of the radiator
    • Move the expansion hose out of the way
    • Remove the plastic cover form the radiator support
    • Remove the clamps from the expansion line
    • Remove the line from the radiator
    • Remove the upper radiator hose with a pair of pliers
    • Remove the four 10mm bolts securing the upper radiator support to the vehicle
    • Lift up and remove the brackets
    • Remove the two 10mm bolts at the top of the radiator securing the A/C condenser
    • Pop out the plastic clips holding the radiator shroud to the radiator with pliers
    • Repeat the step on the opposite side
    • Lift up and remove the radiator from the vehicle
  8. step : Preparing the Radiator (13:19)
    • Change the captured nuts from the old radiator to the new one by
    • Pushing down on the plastic retainer with a pick
    • Remove the cap out
    • Make sure the lock tab is facing out
    • Lock the tab into the new radiator, and push it in with a flat blade screwdriver if needed
    • If needed, drill a hole 16th of an inch away from the edge, 1/4 inch from the fins, and 1/4 from the top of the hole down
    • Drill three more of these holes into the new radiator with a 13/64 drill bit
    • Pull off the rubber mounts from the old radiator
    • Transfer the mounts to the new radiator
  9. step : Installing the Radiator (16:32)
    • Insert the radiator into place with the bushings into the holes on the subframe
    • Snap the plastic clips into the radiator on the shroud
    • Align the A/C condenser with the top holes on the radiator
    • Tighten the two 10mm bolts into the captured nuts
    • Insert the upper radiator supports
    • Tighten the four 10mm bolts into the supports
    • Route the hose to the expansion tank
    • Clamp the hose clip to the radiator
    • Repeat the process on the upper radiator hose
  10. step : Installing the transmission line (19:02)
    • Slide the transmission line into its fitting, pushing straight in until it clicks
    • Double check that it's secure
    • Repeat the process for the other line
    • Tighten the 10mm bolt that secures the passenger sign coolant line to the bottom of the radiator
    • Reinstall the lower radiator hose with sliding lock pliers
    • Tighten the two 10mm bolts securing the A/C condenser to the radiator on the bottom
  11. step : Installing the Radiator Fan (20:22)
    • Insert the fans into the vehicle by lining the slots up with the tabs on the radiator
    • Tighten the three 10mm bolts to the top of the fans
    • Reconnect the fan's wiring harness
  12. step : Reinstalling the Air Intake (21:15)
    • Insert the plastic insulator into place
    • Connect the cooling line to the top of the air box
    • Insert the air box into place
    • Tighten the three 10mm bolts to the air box
    • Insert the air filter into the air box
    • Tighten the air box clamps
    • Tighten the screws to the air box with a flat blade screwdriver
    • Connect the MAF sensor wiring harness
    • Insert the boot to the throttle body
    • Tighten the hose clamp to the air intake
    • Insert the upper radiator support cover
    • Connect the PCV breather line
    • Remove the oil cap
    • Replace the engine cover
    • Replace the oil cap
  13. step : Replacing the Splash shield (23:30)
    • Insert the splash shield into place
    • Press the four clips into the splash shield
    • Press the front clips into place
  14. step : Refilling the Radiator (23:57)
    • Open the expansion tank
    • Insert a funnel
    • Fill the tank with a 50/50 mix of distilled water and orange Dex-Cool coolant
    • Reinstall the expansion cap
    • Let the engine run for 2 minutes occasionally revving to 3,500 RPMs
    • After 2 minutes shut the vehicle down and let it cool
    • Repeat this process a few times to remove air bubbles
    • Always monitor the temp gauge and make sure it does not run over the operating temp
  15. step : Checking the Transmission Fluid (25:10)
    • After the vehicle is raised, supported, and running in park
    • Remove the T45 transmission drain plug
    • If the fluid runs out with the vehicle running, reinstall the drain plug
    • If you do have to add transmission fluid, insert the end of the rubber hose of a hand pump with Mercon 6 ATF fluid

Tools needed for replacement:

    General Tools

  • Pick
  • Drain Pan

  • Materials, Fluids, and Supplies

  • 1 Inch Hose Clamps

  • Pliers, Cutters & misc Wrenches

  • Wire Cutters

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Phillips Head Screwdriver
  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

  • Torx Drivers & Sockets

  • T45 Torx Socket

3.75/ 5.0
4 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Very helpful people
Was very happy that they sent me another radiator after the first one they sent me had a crack in the bottom of it by the quick disconnect. But that one had a tiny crack in the top of it that sprayed fluid under pressure... the service man that took my call was very nice and said they would send me another radiator after they had an expert inspect it , that was 6 weeks ago and havnt heard from them or received the new, inspected radiator.
June 22, 2017
Did not last
Well I guess there was a reason it was so much cheaper then everyone. It did not last 90 days
December 8, 2017
Quality parts fast shipping and a good guide for installation.
September 13, 2018
Excellent delivery service. Radiator was an exact replacement fit to original manufactured part with only one minor adjustment which required removal of plastic flashing on mounting tabs holding the air conditioner radiator. Excellent price when compared with original part. Will order parts from this supplier again.
December 27, 2018
Will this fit my car? Add a vehicle to make sure
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Year Make Model Description
2004-2007Cadillac CTS Cadillac CTS Radiator
Part #: 1ARAD00950

Order must be placed by 4pm ET
Delivery options for:

Estimated Arrival Cost

Deliveries made to PO Boxes and FPO may take longer. See our Shipping & Delivery for more information.

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(26:28 min)