Spivscooby

iTrader: (1)

Need help i want to drain my engine,rad etc of water/coolant how do i get all water out? Is there a plug?

The Zohan

usual way is to remove the bottom rad hose from the rad or block and the expansion tank cap - make sure the heater is set to hot

Rob Day

iTrader: (78)

Im old school, so I would suggest uncliping the bottom hose from the rad

Spivscooby

iTrader: (1)

Ok cheers and would that drain most of the water out? Plus is 5 litres of antifreeze+coolant enough? Cheers

Don Clark

Subaru heaters are a full flow bypass sytem whereby the heater temperature is controlled using air flaps to mix hot and cold air. Doesn't need to be set to hot.

ALi-B

iTrader: (1)

Still should set it to hot when purging air out of the system (purging = running the engine with the header cap removed ) after refilling, to assertain if there is any air lock and satisfy that coolant is actually flowing through the engine.


Oh yes and fill the sytem V E R Y S L O W E L Y ! (give rad both rad hoses a few squeezes whilst doing so)

Fill header tank to 3/4 full to allow air to purge and prevent overflowing when running the engine with the cap removed (topping up as and when).

Don Clark

That may be so, but just as easy to hold the hoses.

My point is that the Subaru heater circuit doesn't use any valves to control the water flow through the heater matrix (as with some/older systems) and will not trap fluid when draining, or air when refilling.