I've been attempting to change the coolant in my '84 Westy today, and it
doesn't seem that the system is full.  I drained the whole system and syphoned
out whatever was left in both reservoirs (because I was changing coolant
types).  Now the amount that I took out doesn't match the amount that I put
back in.  I followed the procedure in the Bentley manual and I can't figure out
what I've done wrong.  Does anyone have any ideas?  So far I've put in about
12.3 litres and the manual says that the system will hold 17.5 litres.  Is it
possible to get all of the coolant out anyways?  Or is there probably still
some coolant left in there from before?

I took the van for a drive and the temperature stayed around half.  I'm going
to try and bleed it again, but I'll wait and see if anyone has any different
ideas.

Thanks in advance,
Ryan