I work for a ford dealer, and were working on a customers excursion.
Its got a 6.0L and the original complaint from the customer was the rear heat was not working correctly.
After pulling it apart, inspecting the doors & motors in the air box all seemed okay, we replaced the heater core and did a thorough flush.
Result: Still no heat
We checked for any stoppage in the hoses and replaced the restrictor in the hose.
The coolant valve is functioning properly also.
Now that we replaced the restrictor, the front heat seems to be not as great either.
When your driving down the interstate it produces almost no heat, if your around town driving and the RPM's are high it does get warm and will heat the cab okay.
We replaced the control head (even though the blend doors and actuators seem to be working properly.)
-no air pockets (thoroughly bled)
-doors and actuators are working properly
-no blockage in coolant lines
- new heater core
-new control head
-blower motor works fine
The idea of blown head gaskets have been discussed (creating air pockets causing no heat) but I wanted to ask the guys at powerstroke forum for help.
Help getting the customers PS back to them and keep them warm in this chilling weather!
Thanks for any help in advance guys.