Still no heat in cab!!! Tried all I know.... help!

Pair of Hounds · #1 (**permalink**) 12-31-2012, 03:11 PM

2005 f350 6.0 with no heat in cab. not even warm. new heater control valve. boiled thermostat on stove and it operates correctly. newer water pump appears to be ok because coolant is circulating in degas tank. next looked into heater core. pipe entering core was very hot and exit pipe was coolish so I replaced core thinking that was problem....old core was full of trash and gunk so I figured I would get heat with new core. still no heat! both pipes on core are scaldin g hot so coolant is flowing through it. blows hard but cold air. egr deleted and no coolant loss. don't know where else to go!! thanks for any input

**southend** · #2 (**permalink**) 12-31-2012, 03:52 PM

Not sure how the damper system works, but you need to investigate that. Idk.

Sent from my phone that somebody didn't help me get.

RedneckYankee · #3 (**permalink**) 12-31-2012, 05:06 PM

Do you have auto climate control? There is one electric actuator on the heating A/C system it operates a blending door for the heater core and evaporator coil. If the is stuck in the cooling mode you have no heat. Check fuses. I believe the plug is on passenger side near center of dash on duct work. There are only 2 electrical connections on duct work blower and actuator. Hope this helps

Pair of Hounds · #4 (**permalink**) 01-05-2013, 12:15 PM

checked all fuses. I don't seem to be getting vacuum to the heater control valve on the care supply hose. the ball valve with grey vac line...maybe bad vacuum pump? 4x4 still works. still cold air from all vents

**Tuscany** · #5 (**permalink**) 01-05-2013, 12:26 PM

Sounds like a bad vacuum pump or bad control valve. Try removing the control valve and putting a hose repair piece in place of it with 2 hose clamps and see if that works. If it does you have narrowed down the problem to a couple smaller things.