Thermostat 6.5L Replace for HUMVEE 5743238 6685-01-444-9478

Product Overview

This Thermostat (6.5L) is a direct replacement for HUMVEE cooling systems, regulating engine temperature by controlling coolant flow. Designed to meet OEM specifications, it ensures reliable engine temperature management for the 6.5-liter diesel engine. This thermostat is essential for maintaining optimal operating temperature in HUMVEE vehicles.

Key Features & Performance

• OEM replacement part number 5743238 with NSN 6685-01-444-9478
• Constructed to exact OEM specifications for proper sealing and temperature regulation
• Ensures consistent engine temperature, preventing overheating or excessive cool running
• Direct fit for HUMVEE 6.5L engine cooling system

Fitment & Compatibility

• Compatible with HUMVEE vehicles equipped with the 6.5L diesel engine

Common Uses

• Used in military and civilian HUMVEE models for engine cooling system service
• Replaces worn or stuck thermostats to restore proper warm-up and cooling
• Common in fleet maintenance and vehicle repair shops

Technical Specifications

• Part Number(s): 5743238 / 6685-01-444-9478
• Engine: 6.5L Diesel
• Temperature Rating: OEM specification – typically 195°F (verify for your application)

Frequently Asked Questions

Q: Will this thermostat fit a civilian H1 HUMVEE with a 6.5L engine? A: Yes, this thermostat is designed for HUMVEE 6.5L engines, including both military and civilian models; verify your existing part number for confirmation.

Q: What is the recommended replacement interval for this thermostat? A: It is generally recommended to replace the thermostat whenever the cooling system is serviced or if the engine runs hotter or cooler than normal.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.