Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Hoses

Print

Upper and lower radiator hoses along with the heater hoses should be checked for deterioration, leaks and loose hose clamps at least every 15,000 miles (24,000 km). It is also wise to check the hoses periodically in early spring and at the beginning of the fall or winter when you are performing other maintenance. A quick visual inspection could discover a weakened hose that might have left you stranded if it had remained unrepaired.

Whenever you are checking the hoses, make sure the engine and cooling system is cold. Visually inspect for cracking, rotting or collapsed hoses, replace as necessary. Run your hand along the length of the hose. If a weak or swollen spot is noted when squeezing the hose wall, the hose should be replaced.



Click image to see an enlarged view

Fig. The cracks developing along this hose are a result of age and hardening



Click image to see an enlarged view

Fig. A hose clamp that is too tight can cause older hoses to separate and tear



Click image to see an enlarged view

Fig. Check for soft, spongy hoses like this one (swollen at the clamp)this hose will eventually burst



Click image to see an enlarged view

Fig. Debris or contaminants in the cooling system can cause a hose to weaken from the inside out

REMOVAL & INSTALLATION





Click image to see an enlarged view

Fig. Mark the hoses so that they can be reinstalled in their original positions


CAUTION
NEVER remove the pressure cap while the engine is running or personal injury from scalding hot coolant or steam may result. If possible, wait until the engine has cooled to remove the pressure cap. If this is NOT possible, wrap a thick cloth around the pressure cap and turn it slowly to the stop. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, still using the cloth, turn and remove the cap.

  1. Remove the radiator pressure cap.
  2.  



Click image to see an enlarged view

Fig. When the engine is cool, remove the radiator cap

  1. Position a clean container under the radiator and/or engine petcock or plug, then open the drain and allow the cooling system to drain to an appropriate level. For some upper hoses only a little coolant must be drained. To remove hoses positioned lower on the engine, such as a lower radiator hose, the entire cooling system must be emptied.
  2.  



Click image to see an enlarged view

Fig. Attach a short length of hose to the petcock before loosening the nut


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant may be reused unless it is contaminated or several years old.

  1. Loosen the hose clamps at each end of the hose requiring replacement. Clamps are usually either of the spring tension type (which require pliers to squeeze the tabs and loosen) or of the screw tension type (which require screw or hex drivers to loosen). Pull the clamps back on the hose away from the connection.
  2.  



Click image to see an enlarged view

Fig. Using a pair of pliers, squeeze the tabs to loosen the upper hose



Click image to see an enlarged view

Fig. As you grasp the hose clamp, slide it back

  1. Twist, pull and slide the hose off the fitting taking care NOT to damage the neck of the component from which the hose is being removed.
  2.  



Click image to see an enlarged view

Fig. Carefully twist, then pull the hose off the neck



Click image to see an enlarged view

Fig. When sliding the lower hose off, remember there will be a small amount of fluid still in the hose

If the hose is stuck at the connection, do NOT try to insert a screwdriver or other sharp tool under the hose end in an effort to free it, as the connection and/or hose may become damaged. Heater core connections especially may be easily damaged by such a procedure. If the hose is to be replaced, use a single-edged razor blade to make a slice along the portion of the hose that is stuck on the connection, perpendicular to the end of the hose. Do NOT cut deep so as to prevent damaging the connection. The hose can then be peeled from the connection and discarded.

  1. Clean both of the hose mounting connections. Inspect the condition of the hose clamps and replace them, if necessary.
  2.  

To install:

  1. Dip the ends of the new hose into clean engine coolant to lubricate and ease installation.
  2.  
  3. If a clamp shows signs of any damage (bent, too loose, hard to tighten, etc.), replace it. A good rule is that a new hose is always worth new clamps. Slide the clamps over the replacement hose, and then slide the hose ends over the connections into position.
  4.  
  5. Position and secure the clamps at least 1 / 4 inch (6.35mm) from the ends of the hose. Make sure they are located inside the raised bead of the connector.
  6.  
  7. Reinstall the petcock and properly refill the cooling system with the clean drained engine coolant or a suitable mixture of ethylene glycol coolant and water.
  8.  
  9. If available, install a pressure tester and check for leaks. If a pressure tester is not available, run the engine until normal operating temperature is reached (allowing the system to naturally pressurize), then check for leaks.
  10.  


CAUTION
If you are checking for leaks with the system at normal operating temperature, BE EXTREMELY CAREFUL NOT to touch any moving or hot engine parts. Once temperature has been reached, shut the engine OFF, and check for leaks around the hose fittings and connections which were removed earlier.

 
label.common.footer.alt.autozoneLogo