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A coolant change on the 10th-gen Accord is one of the easier fluid jobs, but only if you accept its limitation: there is no engine block drain. Pull the front undertray with a 10 mm socket and a clip tool, open the plastic drain cock on the lower driver's side of the radiator, and you get 3-4 quarts out of a system holding 5-6.5 liters. If you want a real fluid exchange rather than a partial top-up, plan on draining and refilling twice with a cool-down in between.
The thing people get wrong is the burp. These engines will trap air at the thermostat, and if you just fill the radiator, cap it and drive off, you get a cold heater, a wandering temperature reading and a reserve tank that swallows coolant for a week. Idle it with the cap off and a funnel full of coolant, heater on full hot, until the fan cycles at least once. And if you have the hybrid, understand that there are two separate loops before you open anything — the PCU/motor circuit uses an electric pump and needs a vacuum filler or a Honda-capable scan tool to bleed properly.
| Item | Type | Product search |
|---|---|---|
| Floor jack 2-ton minimum, pinch-weld pad Lift the front of the car to reach the radiator drain and undertray. | Required | search retailer |
| Jack stands 2-ton pair Support the car at the front pinch-weld/subframe points while you work underneath. | Safety | search retailer |
| Wheel chocks Chock the rear wheels before lifting. | Safety | search retailer |
| Socket wrench 3/8 in drive ratchet with short extension Drives the 10 mm undertray bolts. | Required | search retailer |
| Socket 10 mm 6-point, 3/8 in drive Removes the front splash shield / lower engine cover bolts on all three drivetrains. | Required | search retailer |
| Trim clip removal tool Plastic fastener remover set Pops the plastic push-pin clips holding the undertray without breaking them. | Required | search retailer |
| Drain pan Low-profile, 2 gal / 8 qt Catches the old coolant; needs to fit under a car on stands. | Required | search retailer |
| Needle-nose or slip-joint pliers Grips the plastic radiator drain plug wing if it is tight; also for the reservoir hose clamp. | Recommended | search retailer |
| Long-neck funnel Radiator funnel / spill-free funnel kit with Honda-size adapter Fills the radiator neck without spilling and holds a head of coolant while burping. | Required | search retailer |
| Turkey baster or fluid transfer syringe Empties the old coolant out of the reserve tank so you are not putting old fluid back in. | Recommended | search retailer |
| Honda Type 2 coolant Blue, premixed 50/50 — 1.5T approx 5.0-5.5 L total, 2.0T approx 6.0-6.5 L, hybrid engine loop approx 5.0 L plus PCU loop The correct silicate/borate-free long-life coolant for all 10th-gen Accords; buy 2 gallons if you plan a double drain. | Consumables | search retailer |
| Distilled water 1 gallon For topping off and for an optional flush rinse — never use tap water. | Consumables | search retailer |
| Nitrile gloves Coolant is toxic and an irritant. | Safety | search retailer |
| Safety glasses Protects against hot coolant splash during the burp procedure. | Safety | search retailer |
| Shop rags / absorbent pads Coolant drips onto the subframe and lower hose area; clean it up before it soaks in. | Consumables | search retailer |
| Sealable waste jug 1-2 gal Store the drained coolant for recycling; do not leave it out for pets. | Consumables | search retailer |
| Cooling system vacuum filler Venturi/air-powered, 1/2 in shop air supply Best way to fill without air pockets, and effectively mandatory for the hybrid's PCU loop. | Recommended | search retailer |
| Torque wrench 3/8 in drive, 5-80 ft-lb For the undertray bolts and any hose clamp or bracket fasteners you disturb. | Recommended | search retailer |
| OBD2 scan tool Honda-capable (iHDS/HDS or equivalent bidirectional) Hybrid only: commands the electric water pumps on to circulate and bleed the PCU/motor loop. | Recommended | search retailer |
| Radiator drain plug and O-ring Honda drain cock kit The plastic plug and its O-ring are cheap and commonly crack or weep once disturbed on high-mileage cars. | Parts | search retailer |
Tool sizes are the same across 1.5T, 2.0T and hybrid — 10 mm undertray bolts, hand-turn plastic radiator drain plug, Honda Type 2 blue coolant. Capacity differs: roughly 5.0-5.5 L on the 1.5T, about 6.0-6.5 L on the 2.0T, and about 5.0 L for the hybrid's engine loop. The hybrid adds a second PCU/motor coolant circuit with its own reservoir and electric pump, which requires a vacuum filler or a bidirectional scan tool to bleed; verify capacities for your specific build in the service manual.
| Radiator drain plug (plastic) | Hand tight only — snug until the wing seats, do not use a wrench |
| Front splash shield / undertray 10 mm bolts | verify in the service manual (light, approx 7-9 ft-lb / 9-12 Nm) |
| Radiator cap | Hand tight to the stop |
| Upper/lower radiator hose spring or worm clamps | verify in the service manual |
Honda Type 2 long-life coolant, which is blue and sold premixed 50/50. It is silicate- and borate-free and phosphate-based; universal green or orange Dex-Cool style coolants are not a correct substitute for the aluminum engines and plastic radiator in this car.
Roughly 5.0-5.5 liters total on the 1.5 turbo and about 6.0-6.5 liters on the 2.0 turbo, including the reserve tank. A single radiator drain only removes about 3-4 quarts, so buy two gallons if you intend to do a double drain and refill.
No. The only drain is the plastic plug on the lower driver's-side radiator tank. That is why a single drain and refill leaves old coolant in the block and heater core, and why a repeat cycle is worth doing.
Code 5 is engine coolant replacement. The first interval is long — typically around 10 years or 120,000 miles — with subsequent changes roughly every 5 years or 60,000 miles. You reset it through the driver information interface with the Select/Reset control.