What to know about the Pre-Heater Hose:
Most engines today are fuel injected, but there are still a few vehicles around that use carburetors as an alternative. Whether you own a classic car, or are driving a hand-me-down vehicle without fuel injection, you’ll have a number of different components that requireconsistent service.
The pre-heater hose extends from the exhaust manifold to the air filter assembly. Its only job is to send pre-heated air from the engine into the air filter and then the carburetor during cold weather. It’s a pretty straightforward setup. Warm air is sent from the exhaust manifold into the air filter assembly. There, a flapper is designed to activate depending on temperature. If the exterior temperature is relatively warm, then fresh air is directed into the carburetor. If the temperature is low, warmed air is sent to the carburetor.
It helps ensure proper fuel delivery during cold weather, as well as to stop the carburetor from icing up during winter. It is also essential for passing your emissions test.
Facts to Note:
Pre-heater hoses will crack and wear over time through normal wear and tear.
The pre-heater hose should be examined visually during normal upkeep (oil changes).
If the pre-heater hose fails during warm weather, you may not even notice any change in engine operation.
How to Fix:
The hood is opened and the engine is allowed to cool totally
The cooling system is drained and the faulty pre-heater hose is removed
The new pre-heater hose is linked and the cooling system is refilled
The cooling system is checked for any coolant leaks
The engine is run and cleared of codes and road tested for proper cooling system operation
While the pre-heater hose is not necessary for vehicle operation in most instances, it is an important component, particularly if you have to pass an emissions test. If you’ve observed that your car doesn’t crank well during cold weather, or have seen cracks or other damage to the pre-heater hose, have it changed by one of your expert mechanics.
Common symptoms indicating you may need to change the Pre-Heater Hose:
Cracks in the hose
Bulges in the hose
Hard starts during cold weather
Carburetor icing during winter
Importance of this service:
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The pre-heater hose isn’t absolutely crucial to vehicle operation, but one in working order will go a long way. You’ll need it to pass emissions and safeguard the carburetor from freezing during winter. We recommend having the hose replaced as soon as possible if it’s deemed faulty.