[ascendedmind]

It appears it was an air lock in cooling system.

The mechanic apparently did not open or turn the bleed valve far enough to bleed the air out! After he turned the bleed valve open far enough with a 12mm wrench it started dripping coolant.

Then he slowly added coolant into radiator until it was finally burped of air.

After that was solved I checked the heater but still no heat!

So the mechanic checked the Heater control Panel by switching the heater control lever back & forth. The Heater Control cable became loose & detached itself, so he tweaked the cable with needle nose pliers to prevent the cable from detaching itself again.