Freezing my back side off - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-09-2012, 09:51 PM   #1 (permalink)
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Freezing my back side off

Hey eveybody. Hope ya'll can help me out. Here's the scoop...I have a 2002 F-350 turbo diesel. The heater is not working...blows cold air. Both heater hoses are hot..the heater core is hot.. there is no diverter valve on any of the hoses..the blend door is functioning and I've looked everywhere for the ball point pen stuck in he vent that everybody seems to think is the cause of the problem. I back flushed the heater core today just because I couldn't think of anything else to do. Anybody got any ideas before I turn into a popcicle?
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Old 11-09-2012, 10:16 PM   #2 (permalink)
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How did you verify the blend door is working? There are four total doors in the system.
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Old 11-10-2012, 12:10 AM   #3 (permalink)
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Ahhhh... There is a door to the left of the heater core. It has an arm that opens and closes the door wher you turn the selection knob. Where are the other 3?
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Old 11-10-2012, 09:17 AM   #4 (permalink)
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There is one that deflects main air flow to the defrosters, one that deflects main air to the heater vent, one that controls intake air (recirculation versus outside air) and the blend door. The first three are vacuum controlled. The blend door uses a electronic actuator. Its on top of the air box behind the glove compartment. You would have to pull the actuator off and then move the temperature control to see if it moves.

blenddoor.pdf
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Old 11-10-2012, 10:28 PM   #5 (permalink)
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Thanks for the info RT! I'll check out the actuator tomorrow.
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