Toyota Pick-ups/Land Cruiser/4Runner 1970-1988



On models equipped with an electric cooling fan, disconnect the negative battery cable, or fan motor wiring harness connector before replacing any radiator/heater hose. The fan may come on, under certain circumstances, even though the ignition is Off.


See Figures 1, 2, 3 and 4

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Fig. Fig. 1: Removing the upper radiator hose

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Fig. Fig. 2: Removing the lower radiator hose

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Fig. Fig. 3: Radiator petcock or drain plug

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Fig. Fig. 4: Check or refill the coolant bottle after all repairs

Inspect the condition of the radiator and heater hoses periodically. Early spring and at the beginning of the fall or winter, when you are performing other maintenance, are good times. Make sure the engine and cooling system are 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, replace the hose.

  1. Drain the cooling system into a suitable container (if the coolant is to be reused).

  1. Loosen the hose clamps at each end of the hose that requires replacement.
  3. Twist, pull and slide the hose off the radiator, water pump, thermostat or heater connection.

To install:
  1. Clean the hose mounting connections. Position the hose clamps on the new hose.
  3. Coat the connection surfaces with a water resistant sealer and slide the hose into position. Make sure the hose clamps are located beyond the raised bead of the connector (if equipped) and centered in the clamping area of the connection.
  5. Tighten the clamps to 20-30 inch lbs. Do not overtighten.
  7. Fill the cooling system.
  9. Start the engine and allow it to reach normal operating temperature. Check for leaks.