DIY: Radiator foam
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Hello again RX8club. I ended up replacing my radiator as part of my RX8 rebuild/restore so I wanted to share with you all the re foaming I did on my brand new radiator. I bought this Denso2219238 radiator from Rockauto for $107.79 plus shipping. This was a bargain compared to Mazda's price of $400+ for what appears to be the same part minus the foam. To address that, I picked up some foam from ACE Hardware which closely matched the size of foam still on my factory radiator. This foam was 2 1/4 inches by 2 1/4 inches square and had enough to do the full length and the bottom with some left over I might use on the oil cooler openings. I used an outdoor and HEAT rated liquid nails product which goes on like caulk and dries clear but is very strong. I only had one spot come loose that I'll re-glue. I will take some more pictures once I get the undertray remounted, but here are the pictures. I was really happy with the results and it also sealed the opening the fans had at the edges of the radiator core on both sides.
![Name: DOoCAQz.jpg
Views: 521
Size: 1.60 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285886d1683053429-diy-radiator-foam-doocaqz.jpg)
I cut a slit in the side of the foam for the AC line
![Name: CggfjRB.jpg
Views: 838
Size: 3.92 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285887d1683053429-diy-radiator-foam-cggfjrb.jpg)
All installed minus the wire harness clips
![Name: gXVNcsT.jpg
Views: 651
Size: 1.27 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285888d1683053429-diy-radiator-foam-gxvncst.jpg)
![Name: DOoCAQz.jpg
Views: 521
Size: 1.60 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285886d1683053429-diy-radiator-foam-doocaqz.jpg)
I cut a slit in the side of the foam for the AC line
![Name: CggfjRB.jpg
Views: 838
Size: 3.92 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285887d1683053429-diy-radiator-foam-cggfjrb.jpg)
All installed minus the wire harness clips
![Name: gXVNcsT.jpg
Views: 651
Size: 1.27 MB](https://www.rx8club.com/attachments/series-ii-diy-161/285888d1683053429-diy-radiator-foam-gxvncst.jpg)
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twistedwankel
Series I Do It Yourself Forum
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01-07-2024 09:09 AM