hi guys 2 days ago my heating system stopped working in my 02 Lexus is200 so i checked my coolant levels and was low so topped them up and straight away the heating started working again later that day the car seamed a bit lumpy on start up like it wasn't running on all cylinders so check all the plugs and all was fine started car up after done the plugs and was running fine the next day the coolant was gone engine management light was on and smoking really bad (white smoke ) check the oil and still golden as not been changed long ago no ice cream looking gunk in the oil cap and not over heating and runs fine but engine management light on and all the smoke any ideas thanks guys
