84-87 Toyota Corolla GT-S AE86 Koyo 48mm HH Series Racing Radiator – HH010681 (Manual)

Nobody brags about a radiator, until the temp needle starts climbing.
The Koyo HH Series racing radiator is the all-aluminum upgrade for the AE86 Corolla GT-S, built to keep your 4A-GE cool on the street, the track, and the mountain road. It's a direct-fit replacement for the factory radiator and bolts to the factory fan shroud with no modifications.
Koyorad's 48mm (1.9") Hyper Core has an ultra-high fin density to maximize heat transfer, and one dealer lists it as over 40% thicker than the factory core. Each core is hand assembled, Nocolok brazed, then TIG welded by hand in Koyorad's own factories. A 1/8" NPT female accessory fitting, supplied with a plug, takes a temperature sensor for aftermarket gauges.
Important: the factory radiator cap will not fit. You need the Koyo SKC-13 radiator cap, sold separately.
But this isn't just about the numbers.
Hachiroku owners know the feeling of watching the gauge on a long pull. This is the cooling upgrade that helps keep the car reliable, whether it's a daily, a weekend runner, or a build that gets pushed hard.
🚚 Online orders ship next business day, arrive in 2-4 days
⭐ Local pickup available at our Pico Rivera, CA showroom
📞 Questions on fitment? Call (562) 366-4516 or text (562) 270-5361, happy to help
Features
Genuine Koyo (Koyorad) HH Series racing radiator
48mm (1.9") Hyper Core, high fin density
Nocolok brazed, hand TIG welded, all aluminum
Direct fit, bolts to the factory fan shroud
1/8" NPT female accessory fitting with plug
Koyo SKC-13 radiator cap required, sold separately
Part Number: HH010681
Vehicle Compatibility
AE86: 1984-1987 Toyota Corolla GT-S, 1.6L 4A-GE, RWD
Manual transmission only
Why Buy From JDM CARBOY?
✔ Genuine Koyo Products
✔ Ships Next Business Day
✔ Expert Fitment Assistance
✔ Local Pickup Available
✔ Financing Available at Checkout
✔ Serving the JDM Community Since 2001
Koyo SKC-13 radiator cap sold separately. Professional installation recommended.