23964220 Thermostat Kit | Genuine Volvo Penta Part

🔧 Product Description

A genuine cooling-system thermostat service package for compatible Volvo Penta diesel engines. It regulates coolant flow according to temperature so the engine reaches its intended operating range promptly and receives full cooling flow when required. The thermostat rating, housing arrangement and included sealing items are serial-specific and are supplied under the complete kit number.

⚙️ Key Features

• Genuine Volvo Penta cooling-system thermostat package
• Supports correct engine warm-up
• Controls coolant flow as operating temperature changes
• Suitable for thermostat sticking or temperature-control repair
• Requires model and serial confirmation
• Engine type: Volvo Penta diesel

📋 Kit Contents

• 1 × genuine Volvo Penta thermostat service package - Part Number: 23964220
• Matched thermostat and installation items supplied under the complete kit number

🔌 Function

The thermostat restricts coolant flow during warm-up and opens progressively as temperature rises, helping maintain stable combustion, lubrication and cooling-system performance.

⚠️ Common Signs of Failure

• Engine overheats or runs hotter under load
• Engine takes unusually long to reach operating temperature
• Temperature fluctuates during normal operation
• Cabin-heater or calorifier performance changes where connected
• Thermostat is corroded, stuck or mechanically damaged
• Coolant leakage develops after thermostat-housing service

🛠️ Service Notes

• Note how the old thermostat sits before removing it and fit the new one the same way round, with any small vent hole or jiggle pin uppermost so trapped air can escape
• Clean the housing and its seat carefully, using nothing that leaves grit or scoring in the sealing face, and check that face is flat and free of corrosion
• Use all the parts the kit provides, including the new seal or gasket, and discard the old ones
• Tighten the housing fixings evenly to the figure in the manual for your engine — an alloy housing distorts or cracks easily
• Refill and bleed the cooling system properly, then run the engine up and confirm it reaches and holds temperature while you watch the joint for weeps; never leave the thermostat out to mask an overheat, as engine flow depends on it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 23964220 → Supersedes 23951689 → Supersedes 22865738

OEM / Related Numbers

• 23951689 earlier number superseded by this part
• 22865738 earlier number superseded by this part

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging