V70 Thermostat

[Kev0607]

It depends which way you do it. You'll get more out if you drain the engine block first, then the radiator. However, you're never going to get all the coolant out of the engine/radiator anyway (You'll get maybe 6 litres out at a push, but there's always going to be some left that you can't drain). The handbook states 12.5 litres of coolant is required, but that's on a brand new/dry engine, which yours isn't. The trick is to measure what comes out when you drain it - Use some old containers or cartons of some sort to calculate it. Then put the same amount of new concentrate coolant back into the engine.

For example, lets say a dry/brand new engine takes 12.5 litres, you drain 6 litres out of yours, that leaves 6.5 litres in the engine that you can't drain anyway. Put 6 litres of new concentrate back in, that will mix with what's already in the engine & give you a fairly decent concentration ratio. Your car may be different to this of course, as it depends how much you actually drain as to how much you need to put back in. This is just to give you an idea

Use genuine Volvo concentrate coolant though ideally, not the ready mixed if possible. Using the ready mixed coolant will give you a weaker mix simply because there's water already in it & that's going to mix with what you couldn't drain out of your car, so concentrate is your best bet really. Volvo coolant will last longer & you won't need to do this job for a long time again, so its worth putting the right stuff in.