42, The meaning of life
Join Date: Jul 2009
Location: Melbourne, Australia
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I'd be very cautious about how much/far you are driving in this situation. Your cooling system isn't operating as its designed, so the boiling point will be lower (no pressure to raise the boiling point), the coolant will be leaking constantly, and its really easy (read expensive) to get it wrong.
Changing the expansion tank in not a difficult task, you'll probably want to remove the air filter box so that you have access to the lowed hoses and level sensor connectors. you'll also need to remove the air purging screw and the plastic clips that hold the radiator shroud in place. After that the bottle is pretty simple to remove. Have plug of some sort that you can insert into the lower hose to reduce how much coolant you lose in this process. Make sure that you don't kink the small hose that goes to the expansion tank via the bleeder screw.
Once you have it all changed over, set the car on a incline (Nose up) and add the coolant with the engine running & heater on max, once the expansion tank level stops dropping put the cap back on and go for a drive. Keep checking the expansion tank level for the next few days to make sure no big air pockets have been hiding in your cooling system and have dropped the level.
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Riding in style