The wife came home today and said the heater isn't working in our 96
4Runner (SR5 V6 AUTO). Sure enough, the air coming out of the vents is luke warm at best. However, the rear passenger heat is still working great. I popped the hood and checked that the heater temp control valve was indeed letting the hot coolant pass into the heater core. It was. The heater core return hose was also hot. At this point, I'm lost. I've got a hot hose going into the core and hot hose coming out. Just for kicks I back flushed the heater core and didn't see any debris come out. The flow through the core during the backflush was good. Any suggestions??