ACM Heater Core O-Ring Seal

The ACM Heater Core O-Ring Seal line gives you replacement sealing for the heater core connections in a vehicle's HVAC system. These seals, also sold as heater core O-ring kits or heater core seals, close the gap between the heater core and its coolant tubes or connectors. That keeps hot coolant inside the system.

Why Replace Heater Core O-Rings:

• Rubber seals are exposed to constant heat cycling and coolant. Over time they can harden, turn brittle and begin to seep.
• Worn seals can cause coolant leaks, a sweet antifreeze smell in the cabin, and fogged windows.
• Fresh seals are a sensible part of any heater core replacement. They are also the fix for a leak at the core connections.

Key Features:

• Aftermarket sealing components made to meet or exceed OEM standards
• Designed for a precise fit and straightforward installation
• Built for durability and wear resistance under heat and coolant exposure
• Offered in application-specific versions, so choose the part number that matches your heater core connection

ACM is a trusted name among technicians and DIY enthusiasts for HVAC and climate control sealing parts. Use these seals to restore a leak-free heater core connection and reliable cabin heat.