CUSCO Type A High-Pressure Radiator Cap (1983-87 Corolla / 1987-91 Corolla)

CUSCO Type A High-Pressure Radiator Cap

For 1983–1987 Toyota Corolla AE86 and 1987–1991 Toyota Corolla AE92 coupe equipped with a Type A radiator-cap neck.

Overview

The CUSCO Type A High-Pressure Radiator Cap is a direct-replacement cooling-system upgrade for 1983–1987 Toyota Corolla AE86 and JDM Corolla AE92 coupes built May 1987–May 1991, using the Type A radiator-cap neck. Its 1.3 kgf/cm² pressure rating raises cooling-system operating pressure compared with a conventional lower-pressure cap, increasing the coolant's resistance to boiling during elevated temperatures.

A reinforced main pressure-valve spring and silicone sealing material help maintain system pressure and reduce vapor and air-bubble formation that can interfere with efficient heat transfer. The cap is intended for performance-oriented use where the cooling system is in good condition.

Key Features

• Type A high-pressure radiator-cap design
• 1.3 kgf/cm² pressure rating
• Raises coolant boiling resistance under elevated cooling-system temperatures
• Reinforced main pressure-valve spring
• Silicone sealing material
• Helps reduce coolant vapor and air-bubble formation
• Direct replacement for radiators using the correct Type A cap shape
• For the listed Toyota cooling systems with a Type A radiator-cap neck

Cooling System Performance

Higher cooling-system pressure increases the temperature at which coolant begins to boil, helping the coolant remain in a liquid state during demanding operating conditions. Maintaining liquid coolant improves heat transfer through the engine and radiator and reduces localized vapor formation.

This cap requires a cooling system in good condition. A higher-pressure cap can place additional load on aged hoses, clamps, radiator tanks, seals, and other cooling-system components.

Vehicle Fitment

JDM dates identify production periods; U.S.-Market dates identify model years.

Toyota Corolla — AE86

• 1983–1987: Trueno (JDM) / 4A-GE / Type A radiator-cap neck
• 1983–1987: Levin (JDM) / 4A-GE / Type A radiator-cap neck
• 1985–1987: GT-S (U.S.-Market) / 4A-GE / Type A radiator-cap neck
• 1984–1987: SR5 (U.S.-Market) / 4A-C / Type A radiator-cap neck

Toyota Corolla — AE92 Coupe

• May 1987–May 1991: Levin / Sprinter Trueno coupes (JDM) / 4A-GE or 4A-GZE / original Type A radiator-cap neck

Fitment Notes

• Requires the correct Type A radiator-cap neck. Different or replacement radiators are not interchangeable solely because the car is an AE86 or AE92.
• The 1.3 kgf/cm² rating is approximately 127 kPa gauge and is a higher-pressure setting, not a claim of original Toyota pressure.
• The cooling system must be suitable for the increased pressure. Aged hoses, clamps, tanks or seals can be overloaded.
• AE92 coverage here is JDM Levin / Trueno coupes built May 1987–May 1991. U.S.-Market AE92 and other cap-neck configurations are not included.
• Cap selection depends on the installed radiator neck, not the transmission.

Product Specifications

Brand: CUSCO
Product Type: High-Pressure Radiator Cap
Design: Type A
Pressure Rating: 1.3 kgf/cm²
Application: Engine Cooling System
Seal Material: Silicone
Fit Type: Direct Replacement
Vehicle Chassis: Toyota AE86 / JDM AE92

What's Included

• (1) CUSCO Type A High-Pressure Radiator Cap