PCM Thermostat Retro Kit for H5/H6 & ZR4 Engines - OEM Service Parts

Restore proper engine operating temperature and cooling system performance with the PCM Thermostat Retro Kit designed for PCM H5/H6 and ZR4 engines. This complete service kit is ideal for replacing a worn, sticking, or leaking thermostat assembly—helping maintain stable temps, improve warm-up consistency, and reduce the risk of overheating.

Built for reliable fit and sealing, the kit includes the thermostat along with the matching gasket and O-ring to help prevent coolant leaks during installation. Perfect for routine maintenance or cooling-system repairs on compatible PCM engine platforms.

• Compatibility: PCM H5/H6 & ZR4 engines
• Includes: Thermostat, gasket, O-ring seal
• Function: Regulates coolant flow to maintain proper engine temperature
• Category: Engine service parts / cooling system components
• Fitment: Direct replacement/retro kit for listed PCM engines

FAQ

When should I replace the thermostat?
Replace it if the engine runs hot, takes too long to warm up, shows temperature fluctuations, or if you notice coolant leaks near the thermostat housing.

Does this kit include the seals needed for installation?
Yes. It includes the gasket and O-ring to support a complete, leak-resistant installation.