Why Does This Tundra Have 3 Cooling Systems?! — What You Need to Service Them

Modern trucks are more complex than ever, and the Toyota Tundra Hybrid is a perfect example. In this video, ASE Certified Master Technician Keith from OrtoTech Garage walks you through how to service all three cooling systems on a Toyota Tundra Hybrid: the engine cooling system, the inverter cooling system, and the air-to-water intercooler system for the twin turbo setup.

If you own a Tundra Hybrid, this is critical maintenance. These trucks use separate coolant circuits with electric water pumps, multiple heat exchangers, pressurized caps, and Toyota Super Long Life coolant (pink coolant). Servicing them improperly can lead to overheating, inverter damage, turbo inefficiency, or expensive hybrid system repairs.

In this step-by-step guide, we cover:
Locating all coolant reservoirs
Draining engine, inverter, and intercooler systems
Block drain procedure
Proper bleeding methods
Using an Air Lift vacuum refill tool
Running electric water pumps via scan tool
Hybrid maintenance mode operation

Whether you're a DIY enthusiast or just curious how hybrid cooling systems work, this video breaks it down clearly and professionally.

👉 Always use the correct Toyota-compatible silicate-free, borate-free coolant.

👉 Never open a hot pressurized cooling system.

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Timestamps:
00:00 Introduction – 3 Cooling Systems on This Tundra Hybrid
01:05 Why Modern Hybrid Cooling Systems Are Complex
02:00 Correct Coolant Type & Capacity Specs
04:00 Cooling System Safety & Pressurized Caps
06:30 Overview of Engine, Inverter & Intercooler Systems
10:15 Locating Reservoirs & Components
14:30 Inverter Cooling System Explained
19:30 Air-to-Water Intercooler System Breakdown
24:00 Engine Cooling System Overview
27:30 Finding All Drain Petcocks
32:00 Draining the Inverter Coolant
36:30 Removing TRD Skid Plate / Under Cover
39:00 Draining Intercooler System
42:30 Draining Radiator
45:30 Draining the Engine Block
50:00 Measuring Extracted Coolant
53:00 Reinstalling Covers & Final Checks
56:00 Refilling the Inverter System
58:30 Using Air Lift Vacuum Refill Tool
1:04:00 Cycling Pumps & Initial Bleed Procedure
1:08:00 Hybrid Maintenance Mode Procedure
1:11:00 Using a Scan Tool to Run Water Pumps
1:15:00 Final Bleed, Thermostat Check & Heat Cycle
1:18:00 Final Thoughts & Maintenance Recommendation

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As an ASE Certified Master Auto Technician, I strive to provide accurate and reliable information. However, this video is intended for general educational purposes only and should not be considered specific professional advice. The OrtoTech Garage and its representatives are not liable for any damages, injuries, or losses resulting from the use or misuse of the content presented. Always consult your vehicle’s owner manual or a qualified professional for repairs or modifications. Viewers assume all responsibility for their own actions.

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