What is a heater bypass tube?
A car heater bypass tube helps your car’s cooling system manage your engine’s temperature by circumventing the engine’s thermostat. When you start your car, the bypass tube delivers a bit of heat to the engine. Then, it circulates a controlled amount of coolant through the engine to keep the temperature in check and protect your engine.
When should I replace the heater bypass tube on my car?
A mechanic will decide to replace your car heater bypass tube if it’s leaking engine coolant or malfunctioning in other ways. A faulty heater bypass tube can allow your engine to overheat and you could be looking at more serious damage and repairs in the future.
Signs of a faulty heater bypass tube include:
A sweet, warm smell (this is the smell of coolant)
A puddle of greenish-yellow liquid under your vehicle
Important note: If you smell coolant or find it underneath your vehicle, take your car for immediate servicing.
How often do you need to replace a heater bypass tube?
A heater bypass tube is supposed to last the car’s lifetime. That said, natural wear and tear can damage the bypass tube’s metal material over time. If you start to notice any concerning symptoms like a strong odor of engine coolant from under the hood, check in with a mechanic as soon as possible.
Is replacing a heater bypass tube yourself easy?
Issues with your heater bypass tube are complex and best left to certified mechanics for diagnosis, repair, and replacement. Unless you have years of mechanical experience in auto repair, it’s not recommended to take on the project of replacing the heater bypass tube on your own.