I have no heat in my na fairlane.The things i have checked out are as follows:flushed the core,checked the heater tap,all hoses are hot, all vacum hoses etc are working, swapped computer,reboot computer,{no errors}running diagnostics,everything ok. I finally pulled out the dash,and pulled out blend motor and checked door operation both are working perfectly put it all back,nothing.The air con is ok.all of the above is in perfect working order.What am i missing?there must be something.All help greatly appreciated. Thanks

sometimes the drive arm on the blend door motor jumps out of the slot and although the blend door motor works it doesn't drive anything, you can also set the electronic control panel to self diagnostic mode and this may also help. but pretty sure its at t