Q: how to bleed heating system

on 1998 Isuzu Hombre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
temp gage only go up half way to operational temp. and i have no heat
(1) Answer
while running vehicle, heater on...continuously add antifreeze into radiator opening. Once full, rev engine and put more antifreeze and then cap off.