why is my reservoir tank slowly losing fluid
about a month ago i had a head gasket replaced because it was leaking and i was getting exhaust fumes when i would open the radiator now its good when i open my radiator cap but it seems like im still losing fluid in my radiator not fast slowly thought i thought a new head gasket would help.i wonder if i have air pockets in the radiator if so how can i get them out.i think someone said to start the car with the cap off and heater on if thats correct how long should i run it