Heater Core
Hover over the image to zoom in
Share this:

ToughOne or Ready-Aire Heater Core

Part No. 398240 Warranty  

See if this part fits a specific vehicle.

Check Vehicle Fit

Please note: Advance Auto Parts is proud to carry comparable exact-fit parts from multiple vendors, as such, the item you receive may be one of two quality brands. Both brands meet the same fitment requirements and are equal in their performance and specifications.

Our heaters are designed and tested to meet or exceed OE specifications for form, fit, and function. Using premium quality materials and a clear focus on the highest heat transfer performance possible, our engineers have designed this heater to perform at the highest standards to ensure a warm cab environment during those cold winter months.
Back To Top
Core Height:7 1/2 in
Core Thickness:1 1/4 in
Core Width:8 1/4 in
Inlet Size(s):3/4 in
Outlet Size(s):5/8 in

REVIEW SNAPSHOT®

by PowerReviews
ToughOne or Ready-AireHeater Core
 
4.2

(based on 18 reviews)

Ratings Distribution

  • 5 Stars

     

    (11)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (2)

83%

of respondents would recommend this to a friend.

Pros

  • Easy to install (13)
  • Lightweight (6)
  • Durable (5)
  • Improves engine efficiency (3)

Cons

    Best Uses

    • Replacement (11)
    • Everyday driving (6)
      • Reviewer Profile:
      • Casual driver (7), Auto enthusiast (6), Mechanic (6), Truck enthusiast (5)

    Most Liked Positive Review

     

    Heater Core

    Appears to be as Good as OEM.

    Appears to be as Good as OEM.

    VS

    Most Liked Negative Review

     

    Not so good really.

    Bought on line and found it was made in China at store. Pipes move around (sealed by o-rings and crimped to not fall out?). Found an AC Delco on line with much...Read complete review

    Bought on line and found it was made in China at store. Pipes move around (sealed by o-rings and crimped to not fall out?). Found an AC Delco on line with much better quality even though it was more expensive. If you need one NOW this will work. If you can wait find the Delco part.

    Reviewed by 18 customers

    Sort by

    Displaying reviews 1-10

    Back to top

    Previous | Next »

     
    5.0

    Exactly what I needed

    By Thankful

    from Harrisonburg, Va

    About Me Casual Driver

    Verified Buyer

    Pros

      Cons

      • Difficult To Install

      Best Uses

      • Everyday Driving

      Comments about ToughOne or Ready-Aire Heater Core:

      I haven't had heat in my truck since the beginning of winter when the heater core went out. Originally planned to take one out if my old truck until I realized how much work and time was involved. It calls for about 6 hours of labor and I don't doubt it a bit. So instead I ordered one through you and began taking mine apart to replace it. It's been a pain to get to and replace but the product itself was just what I needed. I will now have heat and won't have to freeze anymore.

      Comment on this review(earn points)

       
      4.0

      replace heater core

      By none

      from Eatonton Ga.

      About Me Mechanic, Over 50 Year

      Verified Buyer

      Pros

      • Easy To Install

      Cons

      • none

      Best Uses

      • Replacement

      Comments about ToughOne or Ready-Aire Heater Core:

      Replace heater core. No leaks at this time. Good fit and looks good.

      Comment on this review(earn points)

      (1 of 1 customers found this review helpful)

       
      5.0

      Good product , fit perfectly no problems

      By Ole J-bird

      from Clearfield Pa.

      About Me Auto Enthusiast, Mechanic

      Verified Buyer
      Level 1

      Pros

      • Durable
      • Easy To Install
      • Lightweight

      Cons

        Best Uses

        • Replacement

        Comments about ToughOne or Ready-Aire Heater Core:

        Easy to install, light, durable well satisfied with the product.

        Comment on this review(earn points)

        (3 of 3 customers found this review helpful)

         
        5.0

        Good replacement

        By Woodrow

        from Michigan

        Verified Buyer
        Level 2

        Pros

        • Easy To Install

        Cons

          Best Uses

          • Replacement

          Comments about ToughOne or Ready-Aire Heater Core:

          Good replacement heater core. Fit and worked as promised.

          Comment on this review(earn points)

           
          5.0

          I would buy again

          By chuge

          from Battle Creek Michigan

          About Me Casual Driver

          Ask me a question

          Verified Buyer
          Helpful Reviewer

          Pros

          • Easy To Install

          Cons

            Best Uses

            • Everyday Driving
            • Replacement

            Comments about ToughOne or Ready-Aire Heater Core:

            Excellent web site to order from easy to follow and find part. The guys at the Columbia avenue store in Battle Creek Michigan were very helpful and friendly. I will definitely use them again.

            Comment on this review(earn points)

            (8 of 15 customers found this review helpful)

             
            4.0

            got the job done

            By getting the job done

            from florida

            About Me Truck Enthusiast

            Verified Buyer
            Level 2

            Pros

            • Easy To Install

            Cons

            • No Improvement In Performance

            Best Uses

            • Everyday Driving

            Comments about ToughOne or Ready-Aire Heater Core:

            it got the job done

            Comment on this review(earn points)

            (8 of 16 customers found this review helpful)

             
            1.0

            caution

            By none

            from catawba nc

            About Me Competitive Driver, Mechanic

            Helpful Reviewer

            Pros

              Cons

              • Leaking Very Badly

              Best Uses

                Comments about ToughOne or Ready-Aire Heater Core:

                installed in january failed in may

                Comment on this review(earn points)

                (9 of 15 customers found this review helpful)

                 
                5.0

                Direct replacement-great

                By Mike

                from Lawrenceville,Ga.

                About Me Truck Enthusiast

                Verified Buyer
                Helpful Reviewer

                Pros

                • Easy To Install

                Cons

                  Best Uses

                  • Replacement

                  Comments about ToughOne or Ready-Aire Heater Core:

                  Great fit .

                  Comment on this review(earn points)

                  (7 of 14 customers found this review helpful)

                   
                  4.0

                  94 k1500 heater Core - Great install

                  By Quazi

                  from Acworth,Ga

                  About Me Auto Enthusiast, Mechanic, Truck Enthusiast

                  Verified Buyer
                  Level 2

                  Pros

                  • Easy To Install

                  Cons

                    Best Uses

                      Comments about ToughOne or Ready-Aire Heater Core:

                      Installed fine, fits good, watch for hidden screws when removing lower heater housing.

                      Just wish it included new firewall seal/gasket, old one crumbled when replacing core.

                      Get new seal before replacing incase you need it, if not return itafter repair.

                      Comment on this review(earn points)

                      (8 of 16 customers found this review helpful)

                       
                      5.0

                      GREAT BUY FOR THE MONEY!!!!

                      By kEVIN

                      from NC

                      Verified Buyer
                      Helpful Reviewer

                      Pros

                      • Durable
                      • Easy To Install
                      • Improves Engine Efficiency
                      • Lightweight

                      Cons

                        Best Uses

                          Comments about ToughOne or Ready-Aire Heater Core:

                          EXCELLENT PRODUCT EASY TO INSTALL.

                          Comment on this review(earn points)

                          Displaying reviews 1-10

                          Back to top

                          Previous | Next »

                          Do you have questions about this product?(earn points for answers!)

                           

                          Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

                          12 Questions | 15 Answers
                          Displaying questions 1-10Previous | Next »
                          • Q:

                            I have a '94 GMC Sierra with a 305. How are inlet and outlet tubes connected to the heater core? Do the tubes rotate at the connections? Or is it a brazed connection, etc.? Thank you for your help.
                            Asked on 6/9/2012 by Anonymous

                            1 answer

                            • CUSTOMER CARE

                              A:

                              The inlet and outlet tubes to the heater core on your GMC Jimmy are clamped on the engine side of the firewall as for the tube could not rotate at the connections.

                              Answered on 6/11/2012 by Vincent from AAP
                          • Q:

                            took out water flow valve replaced heater core still blows cold 1995 tahoe with 350
                            Asked on 1/20/2012 by plow man from adrian mi

                            1 answer

                            • CUSTOMER CARE

                              A:

                              IF your Heater Core is higher than your radiator cap there will be an Air pocket in the heater core, some cars require that you jack up the car so as to purge all the air from the core. If the heater control valve is not hot on both sides that could b the problem. If there is not enough vacuum to the control or valve. Cars have a bleeder valve on the engine-like a bleeder valve on brakes to bleed the air from the cooling system. Check that there is no air at the bleeder. If the thermostat is gone or stuck open or too low Degree, the engine will not produce enough heat. The heater should b used all year for a few minutes so as to keep the core clean. IF not, the core acts as a collector for all the dirt in the system.

                              Answered on 1/21/2012 by Vincent from AAP
                          • Q:

                            i have a k1500 i have heat but antifreeze is leakins on passenger floor mat. do i need to replace the heater core?
                            Asked on 12/9/2011 by Anonymous

                            1 answer

                            • CUSTOMER CARE

                              A:

                              Unfortunately we are unable to diagnose what is wrong with your vehicle without being able to be there with your vehicle. However, I would suggest taking your vehicle to a certified mechanic for a proper diagnosis before buying and having parts installed that may not (solve/be) the problem.

                              Answered on 12/10/2011 by Dennis from AAP
                          • Q:

                            Have a small amount of liquid (appears to be antifreeze) in the passenger's side floor board? Do I need to replace the Heater coil or is there a cheaper way to seal this leak
                            Asked on 9/27/2011 by Anonymous from Spartanburg, SC

                            1 answer

                            • CUSTOMER CARE

                              A:

                              It is better to replace the heater core in order to avoid intermittance.

                              Answered on 9/28/2011 by Vincent from AAP
                          • Q:

                            does this fit a truck with AC and heat, or heater only ?
                            Asked on 9/8/2011 by 1994 K2500 4X4 6.5TD vinF from Granite Falls, NC

                            1 answer

                            • CUSTOMER CARE

                              A:

                              Please provide your vehicle make, full model and engine specification for further assistance.

                              Answered on 9/9/2011 by Aaron from AAP
                          • Q:

                            How hard is it to replace core yourself?
                            Asked on 8/3/2011 by campgurl and guy from Defuniak spgs. fl

                            1 answer

                            • CUSTOMER CARE

                              A:

                              Well this all depends on the skill level of whoever is removing or replacing the part. Some may have a harder time than others who have experience. I would recommend purchasing a Haynes repair manual specifically for your vehicle. This should be able to assist you further into detail on how to repair or replace specific parts.

                              Answered on 8/3/2011 by Vincent from AAP
                          • Q:

                            where is the heater core located? and if the heater core is clogged up how do you unclogg it?
                            Asked on 12/2/2010 by Anonymous

                            3 answers

                            • CUSTOMER CARE

                              A:

                              The heater core is usually located behind the dash board. Sometimes you are able to flush out the heater core to unclogg it but if that does not work, you may have to go ahead and replace it.

                              Answered on 12/2/2010 by Mike the Auto Parts Master from AAP
                            • CUSTOMER CARE

                              A:

                              The heater core is usually located behind the dash of the vehicle. If it is clogged up I would recommend flushing the system out by hooking up a water hose to one of the outlets/inlets that come out from the fire wall in the engine compartment. There should be two of these inlet/outlets where the hoses connect to.

                              Answered on 12/2/2010 by Ron the Auto Parts Rebel from AAP
                            • A:

                              Flushing the heater core is the first choice. Changing it is a very tedious procedure that sometimes involves removing the entire dashboard I.E. Jeep CJ's. Find the Two hoses entering your firewall. One of these is the inlet and the other is the outlet. You need to flush it out backwards (hook the garden hose to the outlet side of the core). You can decipher which is the outlet by hose placement. The inlet is generally attached to the intake manifold and the outlet attaches to the radiator. Unhook both hoses and aim the inlet hose down to avoid getting soaked. Then attach the garden hose to the outlet and let it flow for a while. Then kink the garden hose to build up pressure and release it surging water through the heater core. Continue until the water coming out of the hanging inlet hose is nice and clear. With any luck you just saved yourself a lot of headaches.

                              Answered on 5/24/2011 by Jim from Newark, Ohio
                          • Q:

                            if the blower is on low it will blow loop warm air if i turn it to medium or high it will start off loop warm then go cold would that be the heater core
                            Asked on 12/2/2010 by shawn from mobile , al

                            2 answers

                            • CUSTOMER CARE

                              A:

                              Possibly. Unfortunately we are unable to diagnose what is wrong with your vehicle without being able to be there with your vehicle. We highly recommend taking your vehicle to a reputable shop to have them take a look at it to determine the cause.

                              Answered on 12/2/2010 by Mike the Auto Parts Master from AAP
                            • A:

                              if ur vechical isnt heating up u might have stuck a thermostat .A stuck t-stat or partialy open t-stat will only allow a small amout of coolant through to the heating system of a vehical and wouldn't allow heat to be generated.

                              Answered on 3/15/2011 by cummins crazy from Prump. NV.
                          • Q:

                            I have a k3500 chevy 4x4 truck, 7.4L v8, i asked about the heater core being clogged up.
                            Asked on 12/2/2010 by Anonymous

                            1 answer

                            • CUSTOMER CARE

                              A:

                              The heater core is usually located behind the dash of the vehicle. If it is clogged up I would recommend flushing the system out by hooking up a water hose to one of the outlets/inlets that come out from the fire wall in the engine compartment. There should be two of these inlet/outlets where the hoses connect to.

                              Answered on 12/2/2010 by Ron the Auto Parts Rebel from AAP
                          • Q:

                            TRUCK IS WARMED UP, TURN ON BLOWER NO HEAT, JUST COOL AIR?
                            Asked on 1/21/2010 by S2H

                            1 answer

                            • CUSTOMER CARE

                              A:

                              Sounds like it could either be your heater core being clogged or your heater control valve is not opening up for some reason.

                              Answered on 1/26/2010 by Mike from A.A.P
                          Displaying questions 1-10Previous | Next »

                          Do you have a question about this product? 

                          Create or view your online garage

                          Check out the specials in our monthly flyer

                           
                           
                          Disclaimer We strive to keep all information accurate and up-to-date; however, product availability, pricing, promotions and store hours are subject to change without notice. Please contact Customer Care if you have any questions or corrections.