Having same kind of heating/cooling issue/ car overheats/ them doesnt ??????
 

Having same kind of heating/cooling issue
2000 BMW 328i blows out cold air out of heater, and coolant residue is
blow into the interior and on to inside of window. when i turn the car off
it is lugging like a desiel truck. i have had therm, heater core check and there
alright. please help, totally stumped????

How did they check the heater core? Did they pressure check the cooling system?

If you have coolant getting into the cabin, you have to have a leak at the heater core, or the heater valve, or the line between them. I have not fooled with the heater valve on my e46 and I don't recall noticing where it is.

The usual cause of failure to heat is air in the system.