CSF 3821 Radiator

OE-Style Cooling for Land Cruiser and LX570

CSF radiator Part Number 3821 is a direct-fit cooling replacement built with an aluminum core and plastic tanks in an OE-style layout. It is engineered for the Lexus LX570 and Toyota Land Cruiser applications listed below, including upgraded heavy-duty coverage for select 2021 models.

Key Features

• 2-row radiator design for efficient coolant flow
• Aluminum core with plastic tanks in an OEM-style construction
• Down-flow configuration
• Core thickness: 2 1/16 in.
• Core width: 27 1/2 in.; core length: 23 1/4 in.
• Inlet diameter: 1 1/2 in. left; outlet diameter: 1 11/16 in. right
• Integrated high-efficiency plate-type oil cooler: 15 3/8 in.
• CSF cap number 4514

Product Details

CSF 3821 is part of the brand’s 2 Row Plastic Tank Aluminum Core line, a product line focused on OE-style radiator construction for everyday service replacement. CSF manufactures radiators to high-performance standards and validates cooling performance through lab testing, with broad application coverage across many vehicle platforms. This radiator is built for the Lexus LX570 and Toyota Land Cruiser, including 2021 heavy-duty coverage noted as an 8% thicker 52 mm core versus the OEM 48 mm design.

This part cross-references DENSO Auto Parts 221-3153 for the same application.

What It Helps Address

• Overheating caused by a restricted or aging radiator core
• Coolant leaks from cracked or deteriorated plastic tanks
• Reduced cooling efficiency in high-load driving conditions
• Temperature instability in Lexus LX570 and Toyota Land Cruiser cooling systems
• Service replacement needs for OE-style radiator fitment

Installation Notes

Verify inlet and outlet orientation before installation: inlet is left, outlet is right. Confirm the down-flow layout, core dimensions, and oil cooler connection points against the original radiator before removal. This radiator is listed without a cap included, and the correct cap reference is CSF 4514. Professional installation and a full cooling-system inspection are recommended, including hose condition, clamps, thermostat, and coolant quality.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered and wind-tunnel tested for cooling performance validation. The brand also notes more than 50 years of global radiator supply experience and over 30 million units sold across its product range.

Fitment

• Fits 2021 Lexus LX570, N/A — Upgraded Heavy Duty Core. 8% Thicker 52mm vs OEM 48mm; 2 Row Plastic Tank Aluminum Core
• Fits 2013-2020 Lexus LX570, N/A — 2 Row Plastic Tank Aluminum Core
• Fits 2010-2011 Lexus LX570, N/A — 2 Row Plastic Tank Aluminum Core
• Fits 2021 Toyota Land Cruiser, N/A — Upgraded Heavy Duty Core. 8% Thicker 52mm vs OEM 48mm; 2 Row Plastic Tank Aluminum Core
• Fits 2013-2020 Toyota Land Cruiser, N/A — 2 Row Plastic Tank Aluminum Core
• Fits 2008-2011 Toyota Land Cruiser, N/A — 2 Row Plastic Tank Aluminum Core