Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Mentioned: 5 Post(s)
It's evaporated coolant residue... Drain reservoir and engine coolant, clean pressure cap and reservoir, refill cooling system with water, run engine until thermostat opens, let it cool down, drain again, refill with distilled water, drain, then refill with silicates free long-life coolant mixed 50/50 with distilled (demineralized+deionized if possible) water.
Last edited by invader; 02-06-2012 at 03:53 AM.