Smokin 6.0
Member
I just lost heat last night. I felt past the heat control valve and it's hot all the way to the firewall then when it comes back out of the firewall it's cold. Everything was fine a few days ago and I have had the cooling system drained a few times flushing it. Can a heater core get air locked ? Or should I lean towards it being plugged. I'm going to try and unhook both lines tomorrow and flush just the heater core but I was just curious if they can get air locked