I was bleeding air from my Honda Civic yesterday. Everything was going well until the coolant was still bubbling after 40 minutes of bleeding. I did everything correctly. Turned the heater to max, I checked the lower hose temperature by touching it to see if thermostat opened. It was hot.
After that I drove the car around and with a little bit of hard driving and VTEC. When the car was idle in the garage, I noticed the temperature gauge needle was fluctuating and it was between the hot and middle part of the gauge. Could this be the head gasket? Also I don't have any other choice but to drive it in that condition to the repair shop.