This procedure performs a cooling system pressure test to diagnose leaks, verify radiator cap function, and check system integrity on the 2019-2024 Toyota RAV4 2.5L I4 engine.

Warnings

Tools required

Fluids

• Toyota Super Long Life Coolant (Pink)

Preparation

1. Ensure engine is completely cold to the touch (at least 2 hours after last operation)
2. Park vehicle on level surface and engage parking brake
3. Place drain pan under vehicle in case coolant needs to be drained
4. Verify cooling system is filled to proper level before testing
5. Check coolant condition - test is most accurate with properly mixed coolant (50/50 pink Toyota SLLC and distilled water)

Procedure

1. 1

   Access radiator cap
   Open hood and locate the radiator cap on the driver's side of the radiator near the front of the engine bay. Ensure engine is cold by touching the radiator - it should be cool to the touch.
2. 2

   Remove radiator cap
   Slowly turn the radiator cap counterclockwise to the first stop and allow any residual pressure to release. Once pressure is fully released, press down and continue turning counterclockwise to remove the cap completely. Inspect the cap gasket for cracks, tears, or deterioration.
3. 3

   Inspect coolant level and condition
   Look into the radiator filler neck and verify coolant is visible at or near the top. The coolant should be pink in color and free of oil contamination or excessive rust. If coolant level is low, top off with properly mixed Toyota Super Long Life Coolant before proceeding with test.
4. 4

   Install pressure tester adapter
   Select the correct adapter from your pressure tester kit that fits the RAV4 radiator neck (typically a straight rubber cone adapter). Insert the adapter into the radiator filler neck and ensure it seats firmly against the filler neck opening to create a seal.
5. 5

   Attach pressure tester
   Connect the cooling system pressure tester to the installed adapter. Ensure the connection is secure and the tester gauge reads 0 PSI before beginning the test.
6. 6

   Pressurize the cooling system
   Pump the pressure tester to bring the system to 14-16 PSI (the typical operating pressure for this system). Do not exceed 18 PSI. Watch the gauge closely and stop pumping once target pressure is reached.
7. 7

   Monitor pressure gauge
   Observe the pressure gauge for 2-3 minutes. The system should hold pressure with minimal drop (less than 2 PSI over 2 minutes is acceptable). A rapid pressure drop indicates a leak. Note the rate of pressure loss if any.
8. 8

   Inspect for external leaks
   While system is pressurized, visually inspect all cooling system components including radiator, hoses, hose connections, water pump area (below timing cover on passenger side), thermostat housing (front of engine near upper radiator hose), heater hoses at firewall, and overflow reservoir tank. Look for coolant drips, wet spots, or staining. Use flashlight to inspect underneath engine and behind components.
9. 9

   Check specific leak-prone areas
   Pay special attention to the water pump weep hole (small hole on underside of pump housing), radiator end tanks and seams, upper and lower radiator hose connections, and the thermostat housing gasket area. On this engine, also check the coolant bypass hose connections on the driver's side of the engine block.
10. 10

    Test radiator cap
    Release pressure from the system using the tester's release valve. Remove the pressure tester and adapter. Install the radiator cap onto the pressure tester's cap adapter if equipped. Pump the tester - the cap should hold its rated pressure (typically 14-18 PSI stamped on cap) and release at or just above that pressure. Replace cap if it fails to hold pressure or releases prematurely.
11. 11

    Release pressure and remove tester
    If not already done, slowly release all remaining pressure from the cooling system using the tester's pressure release valve. Once pressure is at 0 PSI, disconnect the pressure tester and remove the adapter from the radiator neck.
12. 12

    Reinstall radiator cap
    Inspect the radiator cap gasket one final time. Install the radiator cap by pushing down and turning clockwise until it stops at the safety catch position. Wipe any spilled coolant from radiator and surrounding components.

Reassembly

1. Ensure radiator cap is properly installed and secured
2. Wipe down any coolant residue from engine bay components
3. If coolant was added, verify overflow reservoir is at FULL mark when cold

Verification

• Test results: System should hold 14-16 PSI for at least 2 minutes with less than 2 PSI pressure drop
• No visible coolant leaks observed during pressurized inspection
• Radiator cap holds and releases at proper pressure rating
• If system failed to hold pressure, document location and severity of leak(s) found for repair
• Start engine and allow to reach operating temperature, then visually verify no leaks appear under normal operating conditions

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