2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE

Transmission Control System: Coolant: Replacement

  1. REMOVE ENGINE UNDER COVER LH 
  2. REMOVE ENGINE UNDER COVER RH 
  3. DRAIN COOLANT 
    1. Remove the transaxle-side reserve tank cap.
      NOTE: Do not remove the reserve tank cap when the engine is hot.
    2. Remove the plug shown in the illustration and drain the coolant.
    3. Install the plug using a new gasket.
      1. Torque: 39 N.m (400 kgf.cm, 29 ft.lbf) 
    Fig 1: Removing Plug
    G02920906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. ADD COOLANT 
    1. Loosen the bleeder plug shown in the illustration and connect a hose.
      NOTE: Insert one end of the hose into the bleeder tank.
    2. Add coolant from the bleeder tank.
      NOTE: Add genuine Toyota Super LLC coolant.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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