How to Inspect Radiator Hoses

Inspect the hose clamps for deterioration.

The radiator hoses on all vehicles should be inspected every 8,000 to 15,000 miles, depending on your driving conditions. Damage to the hoses occurs most often from failed cooling system maintenance. As the radiator hoses age, they begin to break down and corrode from the inside out. The hot coolant that flows through them is under a great deal of pressure, and any weak spots in the hose will cause it to rupture. There are three main things to look for when inspecting your vehicle's radiator hoses, and all can be done right at home, including replacing a defective hose if needed.

Things You'll Need

• Flashlight

Instructions

1. Park your vehicle in a well-lit area or have a flashlight handy during the inspection to provide proper lighting. Raise and support the hood.

2. Inspect the top radiator hose for bulges. A bulge will protrude from the regular shape of the hose, similar to a bump or pimple. Grasp the radiator hose with your hand and slide your hand along the entire length of the hose. If you discover a bulge in the hose, it's a good idea to replace the entire hose immediately.

3. Check the clamps at both ends of the radiator hose. Over time, these metal clamps will begin to rust and eat away at the radiator hose. Look for cracks in the lip of the hose and around the area where the clamps mount. In some cases, the clamps are overtightened. This happens most often during rushed cooling-system repairs. An overtightened hose clamp will cut into the radiator hose. Cracks or cuts in the hose indicate a potential rupture, and you should replace the affected hose as soon as possible.

4. Check the radiator hose for soft spots. Grasp the hose with your hand. It should be difficult to squeeze by hand. You should not be able sink your fingers into it, nor should you feel any mushy soft spots on the hose. Slide your hand along the radiator hose and squeeze it repeatedly to check for soft spots. Check the entire diameter of the hose, not just one side of it. If you feel any soft spots, the hose is defective and requires replacing.

Tips & Warnings

• Use the above procedure to check all of your radiator hoses and the other hoses within the engine compartment. A little preventive maintenance now can save you a costly repair later.

References

• "Haynes Automotive Heating and Air Conditioning Systems Manual"; John Haynes; 2000
• "Chilton's AC and Heating Manual: Domestic Cars and Trucks 1993-1995"; Kerry A. Freeman; 1995

Resources

• "Engine Cooling Systems HP1425: Cooling System Theory"; Ray T. Bohacz; 2007
• "Today's Technician: Automotive Heating & Air Conditioning"; Mark Schnubel; 2008