Hi there, been on the forum a while but this is my first post...
I have a 1999 MPI and when I bought it the heater valve had been bypassed and the heater seemed to be leaking. I've recently replaced the heater valve and the matrix (plus pipes and o-rings) but each time I've used the heater since I'm getting mist/steam out of the vents for a few seconds (I've only been out in it 3 times so far).
I can't find any evidence of water leaking, but I suppose it could be evaporating off. It seems to produce this steam once it gets to full temperature but after 5-10 seconds it seems to disappear again. I have read that new matrixes (matrices?) can be coated with oil at the factory which burns off - could this be the cause of my problems? Or is there something I've missed?
The rest of the cooling system seems to be fine - I've previously flushed it all through, and fitted a new thermostat and expansion cap. Temperature gauge sits at the halfway point and never seems to go above this (although I guess that's no guarantee that it's not actually overheating) but the rad fan seems to but in and out as you'd expect.
Thanks for any tips!
Jim