Calorstat TH6285.87J Engine Coolant Thermostat

Engine Coolant Thermostat for Mercedes-Benz

The Calorstat TH6285.87J engine coolant thermostat is an OE-style replacement built for Mercedes-Benz cooling systems that require precise temperature control. It features an aluminum housing, a rubber O-ring seal, and a jiggle pin weep hole for proper coolant flow and air bleeding during service.

Fits 1994-1996 Mercedes-Benz C220, N/A. Fits 1997-2000 Mercedes-Benz C230, N/A. Fits 1998-2004 Mercedes-Benz SLK230, N/A. Vernet is an OE supplier to Mercedes.

Key Features

• Part number: TH6285.87J
• Engine coolant thermostat with aluminum housing
• Start-to-open temperature: 188.0
• Gasket or seal included
• Seal type: O-ring with rubber seal material
• Jiggle pin weep hole for venting trapped air
• 3-bolt hole mounting pattern
• By-pass valve diameter: 43.0
• Silver finish

Detailed Description

Calorstat TH6285.87J is a thermostat and housing assembly for Mercedes-Benz cooling systems, including the C220, C230, and SLK230 applications listed above. The aluminum housing supports a direct-fit service replacement, while the included seal and O-ring design help restore a secure coolant seal at the thermostat interface. The 188.0 opening temperature specification is suited to maintaining stable engine operating temperature in the intended applications. This part cross-references Gates 33932 for the same application.

Common Issues This Part May Address

• Engine running too cool or too hot due to thermostat sticking
• Coolant leaks at the thermostat housing or seal surface
• Temperature fluctuations from restricted thermostat operation
• Air pockets in the cooling system after service
• Delayed coolant circulation through the engine

Installation Notes and Tips

Verify the housing style, bolt pattern, bypass valve diameter, and opening temperature before installation. Clean the mating surfaces thoroughly and inspect the cooling system for contamination or old seal material before fitting the new thermostat assembly. After installation, refill and bleed the cooling system according to Mercedes-Benz service procedures to help remove trapped air through the jiggle pin weep hole.

Quality Assurance

Calorstat is associated with OE-level cooling system applications, and Vernet is noted as an OE supplier to Mercedes for these fitments. Confirm part number TH6285.87J against the vehicle’s original thermostat specification before ordering.