Dorman 902-5039 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for Toyota and Isuzu

Dorman 902-5039 is a replacement engine coolant thermostat housing built to match the fit and durability of the original housing on specified vehicles. It is made from metal and engineered to handle repeated temperature swings in the cooling system.

Compatible with 1983-1987 Toyota Pickup, 1983 Toyota Celica, and 1989 Isuzu I-Mark, this thermostat housing is a direct-fit cooling system service part for vehicles needing a replacement housing with the correct outlet size and mounting layout. The Dorman 902-5039 also cross-references Dayco 85018 and Motorad CH6039 for the same application.

Key Features

• Metal construction for strength and heat resistance
• Natural finish
• Outlet port diameter: 1.313 in.
• Two mounting holes with 0.313 in. diameter
• 180-degree housing neck angle
• Package contents: thermostat housing with gasket
• Thermostat not included
• No bleeder valve, no bolts included, and no O-rings required

Detailed Description

This engine coolant thermostat housing is designed for cooling system repair where the original housing is cracked, warped, or no longer sealing correctly. The metal housing helps maintain a secure thermostat mounting surface and supports proper coolant flow routing in applications such as Toyota Pickup, Toyota Celica, and Isuzu I-Mark. Dorman 902-5039 is built to match the stock housing form and service requirements on the listed vehicles.

Use this part when servicing a leaking thermostat housing, replacing a damaged coolant outlet, or restoring the thermostat mounting point on a Toyota Pickup, Toyota Celica, or Isuzu I-Mark. The 1.313-inch outlet port diameter and 180-degree neck angle help maintain the original cooling system layout.

What It Helps Fix

• Coolant leaks at the thermostat housing
• Cracked or warped housing surfaces
• Improper thermostat sealing at the coolant outlet
• Corrosion or heat-related housing damage
• Cooling system service on aging Toyota and Isuzu engines

Installation Notes and Tips

Verify the outlet port diameter, mounting hole spacing, and neck angle against the original part before installation. Clean the mating surfaces thoroughly and inspect the thermostat, gasket surface, and adjacent coolant hoses during service. Because the thermostat is not included, reuse or replace it separately as needed. Confirm the application by vehicle year, make, and model before ordering.

Quality Assurance

Dorman designs replacement cooling system components to match original fit and service requirements on specified vehicles. This housing is engineered to withstand extreme temperature changes for extended service life in normal cooling system operation.