<theo.chan@gmail.com> wrote in message news:1129701150.902492.158250@z14g2000cwz.googlegr oups.com...

> I recently had the head machined and the head gasket replaced due to a
> blown gasket on my 1990 honda civic wagon. after this everything was
> fine, except for a hose that was not attached properly; the hose popped
> off and coolant sprayed everywhere, then the engine temperature went
> into the red. I noticed this immediately and then found the detached
> hose and reaffixed it properly and filled the coolant and radiator
> completely.
> I'm finding now that I loose about 600mL of coolant every 400km or so;
> after about 1200km the lost coolant is enough so that the engine
> temperature will go up if the RPMs stay over 3000 for a sustained
> period of time (like on the highway).
> I have a suspicion that coolant is evaporating somewhere or somehow;
> what happens is that when the coolant becomes low the temperature goes
> up when it reaches the air "bubble" and then it goes back down when the
> bubble passes. I'm thinking that it might be more coolant evaporating
> everytime the coolant to air ratio changes. that is to say after 400km
> I'm out 600mL, after 800km i'm out 1500mL of coolant.
> Am I way off the mark here? Any ideas what might be causing this and
> how to remedy it?

If the coolant loss is from the reservoir then you might see it the
moment you shut it off. If the loss is from a pin prick hole on one of the
tubes under the intake, then look for white residue. When a coolant is
loss by a good amount, you have to bleed it.