I'm not getting any heat from rear heater core. I've taken off back panel and felt the lines running into the core and they don't get hot. My heat in the front on both sides work. Fan in back works fine. Ideas? Maybe some pump not pushing water back there? Thanks all

Update...the pipes going back to the rear heater core got really hot once but no hot air blowing. I took off the actuator that switches between hot and cold thinking it wasnt switching. Once out it now seems to work but the pipes aren't getting hot water back to them now. I let the journey run for 20 min and still not even warm a little. What would prevent hot water from flowing back there every time? Front heat works great

 

Hi I had the same issue with my 2012. My third row heating wouldn't get hot, it always seemed cool. First place and thing to check is your coolant reservoir make sure it's filled to the full when cold line. Day a couple of days with the rear heat on. Doing this works any air out of rear coolant lines. If coolant levels is lower than that line, fill with coolant. After a few days of driving check levels again. Usually the third row heat vents blow out hot air, after the car reaches halfway warmed up and driving. How I fixed mind and only needed coolant. Hope this helps.