Four Seasons 91805 HVAC Heater Core

Four Seasons 91805 Heater Core for Tacoma

The Four Seasons 91805 heater core is an aluminum HVAC replacement built for select Toyota Tacoma applications. It is engineered to meet or exceed OEM requirements and uses aluminum core construction for dependable heat transfer in the cabin.

Compatible with 1995-2000 Toyota Tacoma heater core applications and 2001 Toyota Tacoma models built to 9/00, this Four Seasons heater core supports direct-fit service work where the original unit has failed or is leaking. The Four Seasons Heater Core line focuses on OE-style replacement parts for HVAC repair, and part number 91805 follows that approach with application-specific sizing.

Key Features

• Four Seasons Heater Core, part number 91805
• Aluminum heater core construction
• Meets or exceeds OEM requirements
• Core dimensions: 8-1/2 in. length, 6-1/2 in. width, 1-1/4 in. thickness
• Core height: 8.500 in.; core depth: 1.250 in.
• Tube size: 0.625 in. / 15.875 mm on both connections
• Direct replacement style for HVAC heater core service

Detailed Description

Four Seasons 91805 is an aluminum HVAC heater core designed for Toyota Tacoma heating system repair. The core material, tube sizing, and overall dimensions are specified for application-matched replacement, helping restore heat output through the vehicle’s HVAC system. This part cross-references APDI 9010361 for the same application.

Use this heater core when servicing a Tacoma with reduced cabin heat, coolant odor inside the vehicle, or evidence of heater core leakage. The Four Seasons 91805 is a practical replacement for 1995-2000 Toyota Tacoma models and 2001 Toyota Tacoma units built to 9/00.

What It Helps Fix

• Weak or inconsistent cabin heat in a Toyota Tacoma
• Coolant seepage from the heater core assembly
• Fogging or sweet coolant odor inside the cabin
• Restricted heat transfer caused by a failing core
• HVAC performance loss tied to a damaged heater core

Installation Notes and Tips

Verify vehicle build date before ordering for 2001 Toyota Tacoma applications, since this part applies to trucks built to 9/00. Compare the original core dimensions and tube locations before installation, and inspect hoses, clamps, and coolant condition during service. Proper bleeding of the cooling system after installation helps maintain heater performance.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific sizing support consistent HVAC repair results for Toyota Tacoma heater core replacement work.