What to know about the Heater Bypass Tube:
The heater bypass tube lets a small amount of coolant to flow throughout your car engine when the thermostat is closed. It bypasses the thermostat, hence the name. Some engines are furnished with bypass hoses, while others have a bypass passage that forms a part of the cooling jacket in the engine. This is really just terminology – the effect is the same.
The bypass tube stops excessive pressure from being built up within the system, delivers a bit of heat when the engine is started, and enable for even cooling from the point of startup. When the thermostat opens up coolant flow in your car, the engine begins to cool. The car thermostat closes a bit and increases coolant flow through the heater core and the bypass hose.
Facts to Note:
Heater bypass tube replacement is not part of your vehicle’s routine maintenance, so your mechanic will not check it when doing oil change or checking your fluid levels.
Cooling problems can be shattering to your car’s engine.
Don’t assume that the problem is the bypass tube – it could be the thermometer, the radiator, or another defective component in the car cooling system.
If you have pets, keep them away from leaked coolant – it is highly poisonous.
How to Fix:
The vehicle’s hood is opened and coolant is drained
The two heater lines are disconnected from the heater core
The new heater bypass tube is fixed
The coolant is refilled and the vehicle is started
The repair is confirmed and the heater bypass tube tested for leaks
Problems with the heater bypass are not something you should try to analyze or fix alone. This is a analysis and repair issue that is best left to one of your expert mechanics.
READ ALSO:WHAT IS COOLANT TUBE REPLACEMENT
Common symptoms indicating you may need to change the Heater Bypass Tube:
A strong smell of coolant
A puddle of yellow-green fluid (coolant) under your car
Importance of this service:
If there is a problem in your cooling system, you could end up with an overheated engine, and the repairs could be extremely costly. Have one of your expert mechanics determine if the problem is with the bypass tube and change it if required.