Four Seasons 96125 HVAC Heater Core

Heater Core for HVAC Repair

The Four Seasons 96125 heater core is an aluminum HVAC heater core built for dependable cabin heat and stable coolant-to-air transfer. It is a direct replacement style component for drivers servicing heater performance concerns on compatible vehicles, including Honda Civic and Toyota Corolla applications where this part number is used.

Key Features

• Four Seasons heater core, part number 96125
• Aluminum construction for efficient heat exchange
• Core dimensions: 10 in. height, 6 in. width, 2.5 in. depth
• Tube size: 0.625 in. / 15.88 mm on both connections
• HVAC heater core / aluminum style for interior heating service
• Cross-references Gates 6946 for the same application

Product Details

Four Seasons Heater Core 96125 is part of the brand’s heater core line, backed by more than 50 years of mobile A/C experience. The aluminum core is engineered and tested for consistent operation, making it a practical replacement when restoring heat output in the HVAC system. Its compact 10 x 6 x 2.5 inch size and 0.625 inch tube connections help match the original service layout on supported vehicles.

Compatible With select Honda Civic and Toyota Corolla heater core applications, this part number is used in HVAC repair jobs where the original core has restricted flow, leakage, or reduced heating performance. Verify the vehicle’s existing core dimensions and tube configuration before ordering. Four Seasons 96125 is also referenced by other aftermarket numbers, including Gates 6946.

Common Repair Symptoms

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Fogging or film on the windshield from heater core leakage
• Coolant loss with no obvious external leak
• Restricted heater performance from internal blockage

Installation Notes

Confirm core height, width, depth, and tube diameter against the removed unit before installation. Inspect heater hoses, clamps, and the HVAC case for wear or contamination while the system is open. Proper coolant refill and air bleeding are important after heater core replacement to restore normal heater operation.

Quality Assurance

Four Seasons states that its HVAC products are engineered and tested for long service life, drawing on decades of mobile air conditioning experience. Part number 96125 is built as an aluminum heater core replacement for dependable repair work.