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There are typically upper and lower radiator hoses, heater hoses, a bypass hose, and possibly others.

The upper and lower radiator hoses are the largest. Heater hoses are smaller.

Look for bulging, leaks, stiff areas, cracks at end of hoses. 

Coolant hoses often break in the worst weather.  It may be best to have these periodically replaced before they break. Hoses vary widely in quality, lower cost hoses can be thinner, and may not seal as well at fittings.


Smaller, roughly 1/4" to under an inch in diameter. 

Used around engine, on power brake booster, cruise control. 

Look for cracks, stiff ends. Often vacuum hoses can leak as they become stiff, one of many possible causes for rough idle, rough running, and poor fuel economy.

Before bending too much, have spares, as they can become brittle. 


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The objective of this Web Page is to familiarize you with basic auto maintenance
-  in some common emergencies -
not to make you an expert in auto mechanics

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 I am in no way, shape, or form telling you to do this yourself. Your results may vary. If something goes wrong, it is not my fault!
These are just guidelines.