Performance Radiator for Pontiac Grand Prix (1997-2003) 3.1L 3.8L
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Direct-Fit All-Aluminum 3-Row Performance Radiator for 1997-2003 Pontiac Grand Prix
What it Does: Upgrades the factory cooling circuit with a high-capacity 3-row all-aluminum core designed to eliminate heat soak and handle high thermal loads in naturally aspirated and supercharged V6 applications.
The Stock Grand Prix Plastic End Tank Fatigue
Factory W-Body radiators rely on thin single-row cores paired with crimped composite plastic end tanks. Over repeated thermal expansion cycles, these plastic tanks become brittle, developing stress fractures along the tank seams and radiator hose necks. On supercharged L67 applications, elevated coolant and transmission temperatures quickly exceed the thermal rejection threshold of the stock core, inducing heat soak and power derating.
The Engineering Solution
Constructed entirely from aircraft-grade AA5052 aluminum, this crossflow unit features a 3-row racing tube core that vastly increases coolant capacity and surface area dissipation. 100% TIG-welded seams replace failure-prone plastic crimps to withstand elevated operating pressures. The unit integrates an internal 5/8-18UNF transmission fluid cooler and includes a pressure-rated radiator cap for direct bolt-in fitment.
Technical Specifications
| Fitment | 1997-2003 Pontiac Grand Prix |
| Engine / Chassis | 3.1L V6 (L82/LG8), 3.8L V6 (L36), 3.8L SC V6 (L67) / W-Body |
| Stock Output | 160–240 hp / 185–280 lb-ft |
| Core Dimensions | 14-7/8" H x 30-3/7" W (3-Row AA5052 Aluminum) |
| Inlet / Outlet | 1-1/3" (Driver Side) / 1-5/16" (Passenger Side) |
| Transmission Cooler | Internal 5/8-18UNF Fitting |
| Part Number | N/A |
Compatibility
- 1997-2003 Pontiac Grand Prix SE (3.1L V6 OHV L82 / LG8)
- 1997-2003 Pontiac Grand Prix GT (3.8L V6 OHV Naturally Aspirated L36)
- 1997-2003 Pontiac Grand Prix GTP (3.8L V6 OHV Supercharged L67)
- Automatic transmission models with 5/8-18UNF cooler lines
The Pontiac Performance Standard
Engineered to support both stock restorations and modified supercharged L67 builds, this cooling system maintains rock-solid operating temperatures across continuous boost runs and heavy load demands.
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