Coolant Change On Hdi

[moggy74]

Plan to change the coolant on my HDI as ive had the car for 3 years and ive never done it.Please can you tell me how to do it step by step please.many thanks

[Johndouglas]

Plan to change the coolant on my HDI as ive had the car for 3 years and ive never done it.Please can you tell me how to do it step by step please.many thanks

 

I aim to change the coolant in all our cars every two years, although I haven't done the C5 yet. That's supposed to be every 5 years.

 

None of my cars have a drain tap on the radiator so the bottom hose needs to be taken off. There's also a drain on the rear of the engine blocks but I don't bother with them. I let the old coolant drain away then stick a hose into the header tank to flush it through. Reconnect the bottom hose and refill with 50-50 water and anti-freeze. I use water from a dehumidifier. Open the bleed screws - usually two of them, and leave them open until coolant runs from them. Fill the header tank and start the engine at a tick over. If the header tank is at the same level as the rad top, you may need a suitably cut bottle stuck into the tank to raise the level. Keep topping up until the coolant level ceases to fall and coolant flows from the bleed valves. It's as well to check the level after 20 miles or so.