PRODUCT DETAILS
Koyo Aluminum Radiator - 2004-2008 Acura TSX (Manual Transmission)
Your TSX's radiator's been in there for 15-20 years. The plastic end tanks are brittle. The core's clogged with scale and corrosion. You're watching the temp gauge climb past normal when you're sitting in traffic or when you're on the throttle hard. It's going to crack. Probably when you're 30 miles from home on a hot day. Koyo's all-aluminum radiator replaces the entire stock plastic-tank setup with a hand-TIG-welded aluminum unit. No plastic end tanks. No crimped seams. Just 25mm thick dual-core aluminum with Nocolok brazing and a brushed finish. This is the same radiator Koyo supplies to OEMs and it's the same radiator that's sitting in half the time attack cars running K series swaps. You're bolting it in using your stock fan shroud and stock hoses. Two hours to install. Lifetime of not worrying about your radiator cracking in traffic. Koyo's Japan's largest aftermarket radiator manufacturer and they're building these in their own factories with hand-welded tanks and triple pressure testing. This isn't some no-name eBay aluminum radiator. This is a Koyo.
Here's Why Your Stock TSX Radiator's Already Failing
The stock TSX radiator uses an aluminum core with plastic end tanks crimped to the sides. That's the weak point. The plastic's been heat-cycling for 15-20 years. It's brittle. The tanks crack around the filler neck. The crimped seams start weeping coolant. We've seen TSX radiators with hairline cracks in the plastic that the owner didn't even know were there until they checked the coolant level and it was a quart low. The crack opens all the way one day and you're stranded with coolant pouring out and the temp gauge buried in the red. The core's also probably half-clogged. Nobody's flushed their coolant in 10 years so there's rust, scale, and sediment blocking half the tubes. Your radiator's trying to cool but it can't flow coolant through tubes that are packed with corrosion. Koyo's radiator is all aluminum. Hand-TIG-welded end tanks. No plastic to crack. Nocolok-brazed core with precision tube and fin alignment so every tube's flowing and every fin's transferring heat. The core's 25mm thick which is thicker than the stock core. You've got more coolant volume and more surface area so you're moving more heat. Your stock radiator's fighting a losing battle. Koyo's radiator's actually doing the job.
KH Series 25mm Dual-Core with Nocolok Brazing
Koyo uses their KH Series high-density core on this radiator. That's a 25mm thick dual-row core with high-efficiency louvered fins. Dual-row means you've got two layers of tubes stacked on top of each other. More tubes means more coolant flowing through the core and more surface area for heat transfer. The fins are louvered which means they're cut and bent to create turbulence in the airflow. Turbulent air pulls more heat out of the fins than smooth laminar air does. The core's Nocolok-brazed. That's vacuum brazing where the aluminum's heated in a controlled atmosphere and the joints are fused without solder. It's stronger and more uniform than traditional soldering. The tubes aren't going to separate. The fins aren't going to fall off. Koyo hand-assembles every core and then hand-TIG-welds the end tanks to the core. Each radiator's triple pressure-tested before it leaves the factory. They're not shipping radiators that leak. If it leaks, it didn't leave the factory. This is the level of quality control that made Koyo the OEM supplier for half the Japanese car companies.
You Need a Koyo Radiator Cap - Stock Cap Won't Work
The stock TSX radiator cap doesn't fit this radiator. The filler neck's a different design. You need a Koyo SK-C13 radiator cap or a SpeedFactory Type A or a Hybrid Racing Type D cap. Don't try to use your stock cap. It won't seal. You'll have pressure loss and coolant burping out the overflow. The Koyo SK-C13 cap's a 1.3 bar (18.85 PSI) high-pressure cap. That's higher pressure than the stock 1.1 bar cap. Higher pressure raises the boiling point of your coolant from around 250°F to around 257°F. That extra headroom matters when you're running hard or sitting in traffic on a 95°F day. Buy the cap when you buy the radiator. Don't find out the hard way that your stock cap doesn't fit when you're trying to button everything up and the cap's not sealing.
Direct Bolt-In with Stock Fan Shroud and Hoses
This radiator's a direct OEM replacement. Same mounting points as the stock radiator. Same hose connections. Same fan shroud mounts. You're unbolting your old radiator and bolting this one in. No cutting. No drilling. No custom brackets. Your stock upper and lower hoses bolt right up. Your stock fan and fan shroud bolt right up. All your sensors and switches mount in the factory locations. Koyo even includes a billet aluminum drain plug and a 1/8 NPT female accessory port if you want to plumb in a temperature sensor or a coolant return line. Installation takes two hours if you've done cooling system work before. Drain the old coolant, pull the old radiator, bolt in the Koyo, refill with fresh coolant, burp the air out, and you're done. The radiator comes with a brushed aluminum finish. It doesn't look like a cheap eBay radiator. It looks like a piece you'd expect to see on a built car.
What You Get
- Koyo all-aluminum radiator for 2004-2008 TSX (manual transmission only)
- KH Series 25mm thick dual-core (thicker than stock, more coolant volume)
- Hand-TIG-welded aluminum end tanks (no plastic to crack)
- Nocolok-brazed core with high-efficiency louvered fins
- Precision tube and fin alignment (every tube flows, every fin transfers heat)
- CNC-machined billet aluminum filler neck (requires Koyo SK-C13 cap or equivalent)
- Billet aluminum drain plug included
- 1/8 NPT female accessory port (for temp sensor or coolant return line)
- Brushed aluminum finish
- Triple pressure-tested at factory (won't ship if it leaks)
- Direct bolt-in (stock fan shroud, stock hoses, stock sensors)
- Made by Koyo in Japan
Fits This Car
- 2004-2008 Acura TSX Base (manual transmission only, K24A2 engine)
Note: Manual transmission only - automatic cars have transmission cooler in radiator, this doesn't. Stock radiator cap does NOT fit - must use Koyo SK-C13 cap or equivalent (SpeedFactory Type F and Hybrid Racing Type D caps work). Buy cap when you buy radiator. All-aluminum construction eliminates plastic end tank failures (stock has plastic tanks that crack after 15-20 years). Hand-TIG-welded end tanks and Nocolok-brazed core (no crimped seams, no solder joints that fail). KH Series 25mm thick dual-core with high-efficiency louvered fins (thicker than stock, more coolant volume, better heat transfer). Each radiator hand-assembled and triple pressure-tested at Koyo factory in Japan (won't ship if it leaks). Direct bolt-in using stock fan shroud, stock upper and lower hoses, stock sensors and switches. CNC-machined billet filler neck and billet drain plug. 1/8 NPT female accessory port for temp sensor or coolant return line. Brushed aluminum finish. Made by Koyo - Japan's largest aftermarket radiator manufacturer and OEM supplier. Installation takes 2 hours (drain old coolant, unbolt old radiator, bolt in Koyo, refill coolant, burp air). Koyo supplies radiators to OEMs and builds radiators for time attack and racing applications.