Had my coolant changed last week on my 03 sti and after both times ive drove the car the resovoir bottle has been nearly empty?is this because its just working rnd the system or something else,ive just topped back upto the maximum level on both occasions,any help appreciated,i thought if it was topped up once it wouldnt need doing again.thanks.

 

Top up from the header tank.

 

ive got the same problem you mean the tank on the left of the intercooler?

 

I've always been told to pretty much ignore the expansion tank but and just check in the top of the rad/header tank when its stone cold, anything else and you're just wasting your time.

 

ahhh thatll be my problem then its not using any water or leaking it but expansion tank is always low.
so i top it up from rad or header?

 

Ill try that then i did top it up a bit the radiator up day after but it didnt need much,it must stop somewhere though surely once its full its full?

 

No - the metal header tank.
Presuming it hasn't been bled properly, fill at the header tank then squeeze the rad pipes a few times.
Also try keeping the header tank cap on and take off the rad cap - it won't leak!
Then slowly unscrew the header cap off so the level in the rad fills up.
STOP before it overflows.
put caps back on and give all hose a squeeze.
Repeat act with caps.

Better still - take it back to whoever changed the coolant and get them to bleed it properly.