Question about 1999 Ford F250 Regular Cab
Heater quit working its not the heater core
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Posted on Jan 02, 2017
SOURCE: Heater core
There is a small, white, control motor with a square plastic case that controls the blend damper. The motor always fails with the damper on the cold side. It is mounted on the front of the heater box directly behind the center stack (radio, heater controls) and is easily replaced by removing wiring plug and three mounting screws. Motor is about $60 from dealer.
Posted on Dec 03, 2008
here is a link that should be of some help.
Posted on Jan 08, 2009
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
1. Disconnect the battery ground cable
2. Drain the engine coolant.
3. Remove the instrumental panel.
4. If equipped with the 5.4L 4V engine, remove the junction block splash shield.
5. If equipped with the 5.4L 4V engine, remove the bolts and disconnect the cable ends from the starter relay.
6. If equipped with the 5.4L 4V engine, remove the junction block bracket.
7. Disconnect the heater core hose couplings.
8. Remove the retaining screw and remove the A/C plenum demister adapter.
9. Disconnect the vacuum line from the A/C plenum demister adapter.
10. Remove the heater core bracket.
11. Remove the 13 plenum chamber top retaining screws.
12. Remove the plenum chamber top.
13. Remove the blend door assembly from the case.
14. Remove the heater core.
15. The installation is the reverse of the removal.
The heater core should be encased in a box up inside the dash.The best way to find this is to locate the heater hoses that go through the fire wall(about 1 1/4 in diameter).This is a very tight job and you will spend most of you time laying on the floor taking out screws.Be careful not to loose any of the heater core casing screws or bolts and when refilling the coolant system fill the radiator directly,start the engine with the radiator cap off,the level will drop,fill the radiator the rest of the way and replace the cap,allow the engine to reach normal operating temp.(about 10 to 15 minutes)so that the themostat will open and then allow the engine to cool and recheck fluid level.
Posted on Jan 01, 2010
SOURCE: Where is the heater core
Heater core is under the dash, the dash will have to be remove to replace the heater core, you will also need to have the a/c system recover, evac, and recharge if the system has freon, when this repair is done, this is about a 10 hrs. job.
Posted on Dec 06, 2010
Testimonial: "Not the answer I was hoping for, but at least clears the cost up. 145 if it was under the hood, now I am looking at 389 right before the holidays..ugh"
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