This procedure covers removal and replacement of the lower radiator hose on a 2014-2019 Toyota Corolla with the 1.8L I4 engine, including coolant drain and refill.

Warnings

Tools required

Parts

• Lower radiator hose × 1 — Use OEM specification
• Hose clamps (if corroded or damaged) × 2 — Use OEM specification

Fluids

• Toyota Super Long Life Coolant (Pink) — 2 qt

Preparation

1. Ensure engine is completely cold (at least 2 hours after last operation)
2. Park vehicle on level ground and engage parking brake
3. Raise front of vehicle with floor jack and support securely on jack stands
4. Remove engine splash shield by removing plastic fasteners and 10mm bolts
5. Place drain pan under radiator drain cock location

Procedure

1. 1

   Drain coolant from radiator
   Locate the radiator drain cock on the driver's side bottom of the radiator. Turn the drain cock counterclockwise to open. Allow coolant to drain completely into drain pan. Close drain cock when finished by turning clockwise until snug (do not overtighten).
2. 2

   Remove lower radiator hose clamp at radiator
   Locate the lower radiator hose connection at the bottom driver's side of the radiator. Use hose clamp pliers or flathead screwdriver to slide the spring clamp away from the radiator neck, at least 2 inches down the hose. If using a worm-gear style clamp, loosen the screw instead.
3. 3

   Disconnect hose from radiator
   Twist the hose back and forth while pulling away from the radiator neck to break the seal. Remove the hose from the radiator. Residual coolant will drain out, so keep the drain pan positioned underneath. Inspect the radiator neck for cracks or damage.
4. 4

   Remove lower radiator hose clamp at engine
   Follow the lower hose to the water inlet connection on the engine block (passenger side, lower front). Use hose clamp pliers or flathead screwdriver to release the clamp at this connection. Slide the clamp down the hose away from the connection point.
5. 5

   Disconnect hose from engine block
   Twist and pull the hose from the engine block water inlet connection. More residual coolant will drain. Remove the lower radiator hose completely from the vehicle. Inspect both connection points for corrosion or debris and clean with a shop rag if necessary.
6. 6

   Install new lower radiator hose at engine block
   Position the new lower radiator hose onto the engine block water inlet connection first. Push the hose fully onto the connection until it seats against the stop ridge. Slide the hose clamp into position over the connection (approximately 1/4 inch from the end of the hose). Ensure clamp is positioned over the raised bead on the connection.
7. 7

   Secure engine block clamp
   Tighten the hose clamp at the engine block connection. If using spring-type clamps, position the clamp ears properly with hose clamp pliers. If using worm-gear clamps, tighten to specification using a torque wrench.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
8. 8

   Connect hose to radiator
   Route the other end of the lower radiator hose to the radiator neck. Ensure the hose follows the correct path without kinks or contact with sharp edges. Push the hose fully onto the radiator neck until it seats completely against the stop ridge.
9. 9

   Secure radiator clamp
   Slide the hose clamp into position over the radiator neck connection (approximately 1/4 inch from the end of the hose). Ensure clamp is positioned over the raised bead on the radiator neck. Tighten the clamp to specification.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
10. 10

    Refill cooling system
    Remove the radiator cap. Using a funnel, slowly pour Toyota Super Long Life Coolant (pink) into the radiator until it reaches the neck. Fill the coolant reservoir to the FULL line. Pour slowly to minimize air pockets. Total system capacity is 7.5 quarts; approximately 2 quarts will be needed to replace what was drained.
11. 11

    Bleed air from cooling system
    With the radiator cap still off, start the engine and let it idle. Turn the heater to maximum heat and fan speed. Watch the coolant level in the radiator and add coolant as the level drops. Run the engine until the cooling fan cycles on and off twice (approximately 10-15 minutes). Add coolant as needed to maintain level.
12. 12

    Complete refill and reinstall components
    Turn off the engine and allow it to cool for 15 minutes. Check coolant level in radiator and top off to the neck if needed. Install radiator cap securely. Check coolant reservoir level and fill to FULL line if necessary. Reinstall engine splash shield. Lower vehicle from jack stands.

Reassembly

1. Verify all hose clamps are tight and properly positioned over connection beads
2. Ensure no tools or rags were left in the engine compartment
3. Confirm engine splash shield is fully secured with all fasteners installed

Verification

• With engine cold, check coolant level in reservoir - should be at FULL line
• Inspect both hose connections for signs of coolant leaks (look for wet spots or drips)
• Start engine and bring to operating temperature while monitoring for leaks at both hose connections
• After test drive, recheck coolant level and inspect connections again for any seepage
• Monitor coolant level over the next few days and top off if necessary as remaining air bleeds from system

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