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How to Replace Defective Hoses and Weakened Coolant in an Automobile

How to Replace Defective Hoses and Weakened Coolant in an Automobile

The procedure helps to show how the coolant hoses are checked, removed, and replaced. The coolant hose should never be assessed when the engine is hot.

Safety precautions

Protective clothing and equipment must be used whenever a task is performed in a workshop. These protective items include:

  • Hand protection – Rubber gloves and barrier cream
  • Eye protection – such as face masks and safety glasses
  • Respiratory equipment – such as face masks and valved respirators
  • Ear protection – such as earmuffs and earplugs
  • Work clothing – Coveralls and steel-capped footwear
  • In case you aren’t sure what is required then the supervisor can be consulted.

Safety checks

Let the engine cool down before assessing the coolant hose, this will make the handling much easy.

Always make the work area as safe as possible it can be. Workshop equipment that is broken, worn out, or damaged should not be used.

Always make sure that the engine is shut down before checking the radiator hoses.

Always wear suitable personal safety equipment before beginning the work. This will prevent any injuries.

One must observe and understand all the personal safety procedures when doing the tasks. The supervisor can be consulted if you are unaware of anything.

The manufacturer’s personal safety instructions should always be followed to prevent any damage to the vehicle being serviced.


1: The clamps and hoses should be inspected

Both of the hoses that transmit coolant between the engine and the radiator have to be located. One is located at the top of the radiator and the other at the bottom. Each hose has to be squeezed. It will be springy and flexible, if it is weak and soft or brittle and hard, then it needs replacement. Observe any signs of cracking or swelling especially on the susceptible bottom of the lower hose. Inspect that the hoses are not corroded and are being held firmly by the clamps.

2: Removing the hose

Before either of the hoses are removed, drain the coolant from the system. Use an appropriate tool to remove the clamp. If the hoses won’t pull off easily, then be careful not to damage the radiator fitting by applying excessive force. Cut the hose in numerous places to remove it without difficulty. The hose fittings on both the engine and the radiator have to be cleaned using sandpaper.

3: Verify the replacement

Get new hoses and compare them with the removed ones and make sure that they have the same diameter and length.

4: Refit the hose

Apply little sealant to the hose fittings and the make the clamps lose, they have to be placed over the hose ends before the hose is adjusted into position. The clamps have to be tightened securely but be sure not to over-tighten and smash up the hoses.

5: Refill cooling system and check

Use coolant liquids to refill the cooling system and start the engine for a couple of minutes. Check the connections and make sure that there are no leakages. Check the tightness of the clamps again when the engine reaches its typical operating temperature.

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Ekster EU


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