A quick tutorial on how to do an engine coolant change on a W203 C200 Mercedes Benz.
- Replacement Coolant (Premixed or concentrate + demineralised water)
- A drain pan to collect old coolant
- 8mm socket wrench
Prepare the coolant by mixing demineralised water with coolant concentrate to a 50:50 ratio – do NOT use tap water for mixing. Alternatively premixed coolant can be used.
Fill the coolant reservoir with the coolant mixture up to the black line on the reservoir, place the coolant cap back on the reservoir.
Turn on the engine and let the car idle for 10 minutes with the heater maxed out to fully bleed the system.
Check the coolant level in the reservoir, if the coolant requires topping up wait until the car has cooled down before opening the reservoir. Once topped up, reinstall the splash guard beneath the car.