A leaking heater core in your Tundra causes foggy windows and a coolant smell. Here’s how to replace it.
cooling
🚗 Toyota Tundra
Hard
How to Fix Toyota Tundra Heater Core
Red Rocket
·
August 7, 2026
·
⏱ 6-8 hours
·
2007-2019 Toyota Tundra
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Step-by-Step Instructions
-
1
Diagnose the sweet coolant smell.
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2
Remove the lower dash.
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3
Disconnect the heater core lines.
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4
Remove the old core.
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5
Install the new core.
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6
Refill coolant and test heat.
Tools & Parts Needed
- 🔧 Heater core, Coolant, Socket set
Frequently Asked Questions
How long does this fix take?
6-8 hours
Do I need special tools?
Yes — see the Tools & Parts list above.
Is this covered under warranty?
Check your vehicle warranty. Some repairs may be covered, especially if the issue is a known defect.
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