Question about 2003 Ford F350 Super Duty DRW SuperCab

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F-350 super duty heater control won't change from defrost with very little heat

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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seanpwright
  • 2030 Answers

SOURCE: a/c -heat only comes out the defrost opening no

No the switch is probably ok. The problem is most likely the door actuator motor. It is a small electric motor that opens and close the the correct door to direct the air in the ac/heating ducts. These motors take place of the old cables that did the same job.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Posted on Aug 27, 2009

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NismoMaster
  • 146 Answers

SOURCE: heater controls will not work in my 1988 nissan

Defrost mode is a fail safe if the vacuum supply to the control head is lost. It sounds as if you have a break in the vacuum supply line from the engine to the interior of your vehicle. With the vehicle running check for a vacuum leak under the dash on the passenger side. You can use a vacuum hose as a stetscope to help hear it better. And check under the hood on the passenger side where the vacuum hoses are bunched up and see if any are broken and leaking.

Posted on Dec 06, 2009

  • 290 Answers

SOURCE: No heat/defrost 01 corolla

Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.

Posted on Jan 18, 2010

  • 51 Answers

SOURCE: 2000 F250 super duty v10

check the vaccum hoses on the passenger side under hood. I think that there are two hoses but it might be three. they get brittle and leak. but they move a little valve that you can move yourself just to see if heat works then. it is inline with the heater hoses I think. Bear with me though because it has been about 3-4 years ago when I figured this one out. it is definately a vaccum problem. there is also a set of vaccum hoses under passenger side of dash, several colors in it. might want to look there because sometimes kicked by peoples feet but money is on the ones inline with heater core. just move linkage and see if it gets hot air. Hope I helped and didnt confuse.

Posted on Jan 12, 2009

DIESELMUDDER
  • 2760 Answers

SOURCE: 2008 F-350 Super Duty Super Cab doors Rattle

sure :while not hearing of any going bad on something that new(08)
ford allways has had a problem with door hinge pins wearing
and not allowing latch to line up hence it does'nt close tight and rattles

simple sat. day fix for you and a buddy
obtain new hinge bushings (brass) from NAPA
or other store have buddy raise edge of door tap out old bushings with pin punch and hammer ALL FOUR) tap in new ones use a plastic punch if possible to save dammage to new ones
take red crayon and put a line on top and bottom of latch pin shut door and open again What crayon line is missing
top line loosten bottom door hinge move up slightly tigthen bolts
Bottom line missing adjust bottom hinge down then repeat test
till both crayon lines are still there
door is now centered
it won't rattle now
closes easyier too

Posted on Apr 07, 2009

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1 Answer

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is your moter working the fan that bring in the heat. check the hoses that they are not diconected

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Could be a problem with a blend door under the dash.
The blend doors are controlled by vac or electric motors and direct air thru the heater core and the vents.
Defrost is the default position when the HVAC system is not working.

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Check for correct coolant mixture. Also you could have a thermostat that is stuck completely open causing it to flow straight threw the engine block, cylinder heads, heater core, an radiator without stopping long enough to heat the coolant up to provide cab heat. It could also be a clogged heater core. Or a blend door on the HVAC box that is not allowing the heater core door to open. Hope this helps.

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O4 f-350 heat works fine but when i turn the auto 4wd on it will change from like floor to defrost all on its own


you have a vacumn leak at the front hub seals that is exhausting the vacumn supply which in turn the default for the heating system is defrost with a loss of vacumn.

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You should have a heater control valve in one of the heater hoses. Check that when you set the controls all the way up hot that the valve is opening the whole way to allow hot coolant to run thru the heater core. If the valve is working and allows flow, you may have to take it out to check it. Then the problem will be the heater core is most likely clogged and needs cleaned out or replaced.

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If you are sure all the things you fixed are working good then I would say its the heater control valve around $30 and looks like this hope this helps

6ac94d7.jpg

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Sounds like you need to replace your heater core.

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The gray vacuum hose is for your heater control valve. It shuts it off when on max a/c . Repair the hose and put it back on. It can also cause your a/c to blow out the defrost.

Oct 15, 2009 | 2006 Ford F 350 Super Duty

1 Answer

03 f150 heat only comes out defrost


You have a vacuum leak. Defrost is the default postion (no vacuum). Since it is working correctly in the ac postion I would suspect the problem is at the floor/panel door.This one is located on the drivers side of the heater box just to the right of the accelerator pedal.

Jan 29, 2009 | 2001 Ford F250 Super Duty Super Cab

1 Answer

Ford 2006 F350 Air Climate Control


press the auto button and the floor defrost button together for a couple of second and it will change between the two
good luck
if you found this helpful please rate Fixya
thanks
paul

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