rear heater

What can I look at to see why I'm not getting heat out of the rear heater vents? Im having no problems with the rear vents

Thanks in advance

I just visited this site after a long absence. Hope you have solved your problem. In case you haven't: does the rear fan work? I'm guessing yes but if not check fuses and power to blower motor. Some people put a valve in the water hose running to the rear heater so they can shut off the hot water running back there in the summer. Maybe you have one that hasn't been opened? If the hose is getting hot water back to the rear heater and the heater core is not heating up then you've likely got a clogged heater core. After many years they will become clogged with junk and need replacing. The rear heater core in my '87 van needed replacement about 2 years ago. That was an easy decision because it started leaking, but it had been putting out less heat before failure.