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

Heater Unit

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REMOVAL & INSTALLATION



Front


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Fig. Front heater unitLand Cruiser



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Fig. Heater unit componentsT100



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Fig. Location of the heater unit4Runner

Have a lot of towels handy for the leakage of coolant that may spill into the vehicle interior.

  1. Discharge the A/C system (if applicable), using an approved recovery/recycling machine.
  2.  
  3. Remove the cooling unit (if applicable).
  4.  
  5. Drain the cooling system.
  6.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could 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 should be reused unless it is contaminated or is several years old.

  1. Disconnect the hoses from the heater core. Tag each one so that it may be correctly reinstalled.
  2.  
  3. On some models, you will need to remove the glove box assembly. On others, remove the instrument panel and reinforcement.
  4.  
  5. At the heater case under the dash, disconnect the ductwork from the case.
  6.  
  7. Disconnect the heater control cables from the heater case.
  8.  
  9. Lift the spring clip holding the control cable to allow the cable to be manipulated.
  10.  

Do NOT deform or crimp the cables.

  1. Disconnect the wiring harness from the blower fan.
  2.  
  3. Remove the three or four bolts holding the heater case to the dash. Because the inlet tubes project through the firewall, the unit will not fall straight down. It will need to be pulled into the passenger compartment and then brought downward.
  4.  

To install:

  1. Lift the case into position and carefully place the inlet and outlet pipes through the firewall. Install the retaining bolts holding the case to the dash.
  2.  
  3. Connect the wiring harness to the blower fan.
  4.  
  5. Connect the control cables to their linkages. Each must be adjusted so that the motion of the dashboard lever causes the correct corresponding motion in the air door. Both the control lever and the door must reach maximum travel at the same time if full function is to be achieved.
    1. Set the dashboard control to FRESH . Lift the adjustment clip and adjust the air inlet cable towards the heater unit until the linkage is at its maximum travel on Pick-Up and 4Runner. For Land Cruiser, adjust the cable away from the case. Release the adjustment clip.
    2.  
    3. Set the dashboard control to VENT (Pick-Up) or DEF (4Runner and Land Cruiser). Lift the adjustment clip and adjust the air flow control cable towards the heater unit until the linkage is at its maximum travel. Release the adjustment clip.
    4.  
    5. Set the temperature control to COOL . Lift the adjustment clip and adjust the air mix control damper control cable away from the heater case until the linkage is at its maximum travel on. For Land Cruiser, adjust the cable towards the case.
    6.  

  6.  
  7. Connect or reinstall the ductwork. Make certain each tube is firmly and completely fitted on its port. A light spray of glass cleaner serves as a good lubricant; do NOT use too much lubricant.
  8.  
  9. Install the glove box and/or instrument panel assembly.
  10.  
  11. Connect the heater hoses. Use new clamps.
  12.  
  13. Install the cooling unit (if equipped).
  14.  
  15. Refill the coolant, and then charge the A/C system (if equipped).
  16.  

Rear
LAND CRUISER


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Fig. Exploded view of the rear heater unit



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Fig. Rear heater box componentsLand Cruiser



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Fig. Location of the coolant hose clamps



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Fig. Proper positioning of the coolant hose clamp



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Fig. Remove the cooler bracket



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Fig. Remove the rear heater duct



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Fig. Unfasten the retainers, then carefully remove the rear heater unit



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Fig. To remove the rear heater radiator remove the 3 screws and two clamps



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Fig. Remove the 2 screws and 2 clamps to remove the heater radiator pipes

  1. Drain the engine coolant.
  2.  
  3. Detach the coolant hoses from the heater radiator pipes.
  4.  
  5. Remove the front seats.
  6.  
  7. Detach the heater control assembly.
  8.  
  9. Disconnect the rear console box.
  10.  
  11. Remove the front console box cover.
  12.  
  13. Detach the finish panel from the lower center cluster.
  14.  
  15. Remove the scuff plates from the front door.
  16.  
  17. Detach the cowl side trims.
  18.  
  19. Remove the rear door scuff plates.
  20.  
  21. Detach the center pillar trim.
  22.  
  23. Push the floor carpeting back.
  24.  
  25. Remove the cooler bracket.
  26.  
  27. Remove the heater duct by removing the bolt and screw.
  28.  
  29. Detach the heater unit connector.
  30.  
  31. Remove the bolts from the heater unit.
  32.  
  33. Lift the heater unit out of the vehicle, using caution not to spill any antifreeze on the interior of the vehicle.
  34.  
  35. Remove the fasteners and pull the heater radiator out of the case.
  36.  
  37. Installation is the reverse of removal. Remember to push the coolant hoses on to the heater radiator pipe as far as the second ridge.
  38.  

If the heater hoses are not seated properly, they will leak

4RUNNER


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Fig. Disconnect the coolant hoses



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Fig. Remove the 3 screws from the heater unit



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Fig. Proper heater hose clamp positions

  1. Drain the engine coolant.
  2.  
  3. Remove the front seats.
  4.  
  5. Remove the center console.
  6.  
  7. Push back the floor carpeting.
  8.  
  9. Detach the coolant hoses.
  10.  
  11. Remove the rear heater duct.
  12.  
  13. Remove the rear heater control assembly.
  14.  
  15. Remove the rear heater duct by removing the three screws.
  16.  
  17. Installation is the reverse of removal. Make sure to install the hose clamps in the proper position.
  18.  

 
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