Motorad T136 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Overview

Motorad Standard T136 is an engine coolant reservoir cap built for open cooling systems that use a vented, push-fit design. It is made with rubber and plastic components, includes a pre-installed gasket or seal, and uses relief and vacuum valves to manage pressure changes in the reservoir.

Key Features

• Standard replacement cap for engine coolant reservoir applications
• Fits open system cooling setups with vented construction
• Push-fit attachment for straightforward service replacement
• Black round cap with indicator markings
• Rubber and plastic construction with a pre-installed gasket or seal
• Designed with proper relief and vacuum valves for cooling system operation
• Compatible With Toyota Sienna and Lexus RX350 / RX450h applications listed below

Detailed Description

Motorad T136 is engineered to meet OEM specifications for coolant reservoir service and is part of the Motorad Standard line. The design focuses on correct sealing, pressure control, and easy removal during routine maintenance. For fitment-specific searches, this cap is used on 2011-2020 Toyota Sienna, 2010-2015 Lexus RX350, and 2010-2015 Lexus RX450h applications noted with the coolant hose assembly and standard configuration. This part cross-references Monroe Shocks & Struts (e.g., 703-5499, 164050P040) for the same application.

Common Issues This Part Addresses

• Coolant reservoir cap seal wear that can allow pressure loss
• Venting or vacuum valve problems that affect reservoir operation
• Cracked, brittle, or damaged cap material
• Improper fit on open-system coolant reservoir necks
• Service replacement needs for Toyota Sienna and Lexus RX350 / RX450h cooling systems

Installation Notes and Tips

Verify the reservoir neck outside diameter and system type before installation. This cap uses a push-fit attachment and is intended for open, vented coolant reservoir applications. Confirm the vehicle listing and notes match the existing reservoir assembly, especially on Toyota Sienna and Lexus RX350 / RX450h models with the coolant hose configuration.

Quality Assurance

Motorad manufactures this cap to OEM specification targets and quality tests it for demanding automotive cooling system conditions. The cap is built with proper relief and vacuum valve function to support consistent reservoir performance.