Coolant Reservoir

This procedure covers the removal and replacement of the coolant reservoir on a 2018-2024 Honda Accord with the 1.5L turbocharged engine.

Warnings

Tools required

Parts

• Coolant reservoir × 1 — Use OEM specification
• Coolant reservoir cap × 1 — Use OEM specification (if damaged)

Fluids

• Honda Type 2 Coolant (Blue) — 2 qt

Preparation

1. Ensure engine is completely cold (minimum 2 hours after last operation)
2. Place vehicle on level ground and engage parking brake
3. Open hood and secure with prop rod
4. Locate coolant reservoir on driver side of engine bay, near firewall

Procedure

1. 1

   Release cooling system pressure
   Slowly turn the reservoir cap counterclockwise to the first detent and wait for any residual pressure to release. Once pressure is released, remove cap completely and set aside.
2. 2

   Drain coolant from reservoir
   Place drain pan below the reservoir. Disconnect the lower coolant hose from the reservoir by squeezing the hose clamp with pliers and sliding it back, then pull the hose off the reservoir nipple. Allow coolant to drain into pan.
3. 3

   Disconnect upper coolant hose
   Locate the upper coolant hose connection on the reservoir. Squeeze the hose clamp and slide it back along the hose, then carefully pull the hose off the reservoir nipple. Some residual coolant will drain.
4. 4

   Remove reservoir mounting bolts
   Using a 10mm socket, remove the two mounting bolts securing the coolant reservoir to the body bracket. Support the reservoir with one hand while removing the second bolt to prevent it from falling.
   Torque spec

   Reservoir Mounting Bolts8 Nm (6 lb-ft)
5. 5

   Remove coolant reservoir
   Carefully lift the reservoir upward and out of the engine bay. Inspect the reservoir for cracks, discoloration, or damage. Pour any remaining coolant into the drain pan.
6. 6

   Inspect hoses and connections
   Examine both coolant hoses for cracks, hardening, or deterioration. Check hose clamps for corrosion or damage. Replace any components showing wear. Clean the hose connection points with a shop towel.
7. 7

   Install new coolant reservoir
   Position the new reservoir into the mounting bracket, ensuring it seats properly against the body. Install both mounting bolts and tighten to specification using a torque wrench.
   Torque spec

   Reservoir Mounting Bolts8 Nm (6 lb-ft)
8. 8

   Reconnect coolant hoses
   Push the upper coolant hose firmly onto the reservoir nipple until it bottoms out, then slide the hose clamp into position over the connection point and tighten to specification. Repeat for the lower hose. Ensure both connections are secure.
   Torque spec

   Hose Clamps4 Nm (3 lb-ft)
9. 9

   Refill cooling system
   Using a funnel, slowly pour Honda Type 2 Blue coolant into the reservoir until it reaches the MAX line. Start the engine and allow it to warm to operating temperature with the reservoir cap off. Add coolant as the level drops during warm-up.
10. 10

    Bleed air from cooling system
    With engine at operating temperature, locate the coolant bleed screw on the thermostat housing. Loosen the bleed screw slowly until coolant flows without air bubbles, then tighten to specification. Top off reservoir to MAX line.
    Torque spec

    Bleed Screw6 Nm (5 lb-ft)
11. 11

    Install reservoir cap and final check
    Install the reservoir cap and tighten securely. Allow engine to run for 5 minutes, monitoring for leaks at all connections. Check coolant level once more after engine cools and top off if necessary.

Reassembly

1. Verify all hose clamps are properly positioned and tightened to specification
2. Ensure reservoir cap is installed correctly with pressure valve facing up
3. Wipe down any spilled coolant from engine bay components

Verification

• Check for coolant leaks at reservoir connections with engine at operating temperature
• Verify coolant level is at MAX line when engine is cold
• Confirm reservoir is securely mounted with no movement or rattles
• Test drive vehicle and recheck coolant level after cooling period
• Monitor coolant level over next few days to ensure no leaks are present

Related trouble codes on this vehicle

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