Ford Super Duty (1999-2016) :: HVAC Control - A/C Only Works On Max


Nov 2, 2014

I just picked up this truck and have found my first undisclosed problem. The A/C only works on MAX. If you turn to any other setting, regardless of selected temp, the air blows hot. And I mean full hot! I was thinking the control panel assembly is bad?

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Ford Super Duty (1999-2016) :: Fan Control Works Intermittently

My fan control went out yesterday (hot day with no A/C), It comes back on at times, but if it's on three it may only blow like it's on one. What I need to replace??

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Ford Super Duty (1999-2016) :: Cruise Control Works Only When Engine Is Cold

I have a 2000 f250 7.3 and the cruise control works when only when the engine is cold. Once the truck warms up, cruise will shut off and not reactivate. I have no lights on on the dash new clutch safety switch a new sensor on the master cylinder horn works and have had a scanner hooked up and compared the electrical values of the buttons pushed to the spec.

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Ford Super Duty (1999-2016) :: HVAC Goes To Full Defrost And 4WD Does Not Engage

I have a 2005 F350 6.0 with 4 wheel drive.

Late last winter, the 4WD stopped working. I diagnosed it to be a vacuum problem. Like a moron, I purchased a vacuum pump and threw it in there, I just figured that it was bad. It turns out the new pump I bought was bad, but the old pump was fine... Go figure. At any rate, when I switch to 4WD, my HVAC goes to full defrost and the 4WD does not engage.

I think I've narrowed the problem down to the 4WD actuator, since if I hook the vacuum pump output directly to the hubs, the 4WD works fine. If I switch it into 4WD, I can hear the vacuum releasing in the actuator, but it doesn't seem like any vacuum actually gets routed to the hubs. It just opens to atmosphere.

I've noticed that after switching to 4WD, the actuator only "Releases" the vacuum for a few seconds, and then seems to close itself. Is this normal? If I cycle the 4WD selector from 2WD to 4WD repeatedly, it will continue to cycle.

1. Is there any way to service this valve, or should I replace it?

2. Is the valve acting normally?

3. Am I on track with this repair?

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Ford Super Duty (1999-2016) :: Luke Warm Air When HVAC Controls Turned To Hot

When my hvac controls are turned to hot, I'm getting only luke warm air. When moved over to cold it feels like the a/c is on...granted it is 21 degrees here. What I've done so far:

1. Flushed the coolant system at the local COOP TBA

2. Flushed heater core-Both heater hoses are hot to the touch as well as the heater core itself. The hoses are within 10 degrees of each other tested by an infrared temp gauge.

3. Verified the blend door actuator is moving. I can see it spin while attached to the box as well as I pulled it out and plugged it in it will move from hot to cold.

4. Smacked the #$%! out of the blend door box.

The fan still functions as it should from low to high. The truck also gets up to operating temp as usual.

Is it possible the actuator is still faulty even though it moves and not going all the way to the heat side? I considered picking up a replacement but I hate to start throwing parts at it.

Did the blend door give up? The snow is here and I need the heat for those 4am waterfowl hunting trips.

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Ford Super Duty (1999-2016) :: 2011 F350 - HVAC Vents Stuck

So my vents stopped actuating to different positions in my 2011 6.7 F350. I read that it could be a vacuum pump or solenoid issue. In any event, I turned 4x4 on and went down the street and made a u-turn - 4x4 seems to be on as the truck wants to hop the outside wheel when turning. I want to check the vacuum pump anyway but for the life of me cannot find it anywhere. Moreover, google turns up nothing which is making me start to believe the new trucks have a completely different system.

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Ford Super Duty (1999-2016) :: 2004 - Speedometer And HVAC Lights Dead

I'm installing an aftermarket radio in my 2004 SD. The illumination control stopped working (when I turn on the lights, the radio doesn't get darker), and now the dash and a/c panel aren't backlit any more.

This is the first time I've driven it since the new radio. I thought I might have seen a spark when testing to see which wire was the illumination control, but I'm not sure. I've got a fuse box diagram, but so far all the fuses look good.

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Ford Super Duty (1999-2016) :: F250 - HVAC Blower Motor Stopped While Driving

My HVAC blower motor stopped today while the wife was driving the F250. I thought I should swap relays (with the heated mirror relay - same Ford Part Number) to rule it out or identify it as the culprit. However, since these are close to the firewall, I have a hard time getting the grip and leverage to pull the relay out of the Battery Junction Box (BJB). How to make this a bit easier?

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Ford Super Duty (1999-2016) :: 2006 F350 - HVAC System Is Melting / Blowing Scalding Hot Air

I was recently on a trip pulling my 32' Travel Trailer, and out of the Hvac system started blowing scalding hot air and soot and smoke into the cab. I pulled over to check things out and could find nothing wrong. When the turbo kicks in it blows even hotter. I could find nothing wrong at the time. As I got back on the road again it started again a few miles down the road.

I made it home and started checking things out. Around the dash, airbag, glove box, on the window , headliner and carpeting, is covered in soot and smoke. the computer is now telling me that ALL the doors are ajar, power locks and key fob do not work, 3/4 of the window switches do not work and 1 window does not work now. I removed the glove box and the panel underneath it to look at the HVAC system.

What I saw about made me cry. The Plastic that houses the HVAC system had started melting and the HVAC hoses have melted. I have still not found the reason for any of this to happen. Also when I got the truck a year ago the Turbo would spool up around 1800 to 2000 RPM. Now it does not spool up until around 3000 to 3250 RPM.

HVAC system and hose

HVAC system housing

Glove Box and Vent

Air bag and Vent

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Ford Super Duty (1999-2016) :: 2011 - A/C Works Intermittently?

I have a 2011 F250 6.2 xlt 221k miles. I have an issue where my AC works sometimes and other times it doesn't work. On the occasion it will work kind of, meaning that it will blow cold for a few seconds (when the compressor clutch engages, but as soon as the clutch disengages I get warm air. My low pressure is at about 30psi and the high is about 140psi (seems low to me). When I bought the truck the a.c. didn't work at all. I pulled a vacuum and put the recommended 29oz of 134a in it. When it works its VERY cold. There doesn't seem to be any ryme or reason (temp, humidity, drive time) as to if it works or not. On occasion (not working) I have been able to turn off the a.c. for a couple minutes and when I turn it on it works.

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Ford Super Duty (1999-2016) :: Heat Only Works At 70 Mph But Not While Idling

I have an F-250 Ford, 2006, 6.0 turbo-diesel. Started noticing that my heat only works while running at 70 mph or more and the turbo is at around 15-20 psi. Now that it has gotten cold it is definitely an issue. Truck does not overheat, I am not able to feel heat on the hose after control vlave and I do not feel any vacuum on the line (grey) to the control valve. I have checked for leaks, changed out the fill cap, checked anti-freeze level, pulled control valve just to verify its position when opened (which it seems to stay open). It's getting really cold in the cab of that truck now.

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Ford Super Duty (1999-2016) :: F350 V10 Fan Switch Only Works On High

1999 F350 Crewcab 4x4 dually V10. Fan switch only works on High. All fuses and relays look Good. Is it a bad speed control switch? What can it be?

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Ford Super Duty (1999-2016) :: Power Windows Works Intermittently?

Over the last few years my power windows in my '99 Super Duty have started working intermittently. The problem seems to be with both the main controls on the drivers door and the control on the passenger door. Sometimes both of them have problems operating, sometimes just one. Does not make a lot of sense. Could I have bad switches or do I need to check something else?

Rowland '99 Ford Super Duty 7.3 Diesel Dually

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Ford Super Duty (1999-2016) :: 2001 - Blower Works Better On A/C Compared To Max Setting?

My 2001 f350 a/c blower works better on a/c compared to max a/c . When I turn the selector to max a/c it makes more of a blowing noise but less air blows out of the vents though. When I select plain a/c it makes less noise but blows more air out of the vents. What is wrong and how to go about fixing it is 93 here today and won't get much cooler over the summer months .

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Ford Super Duty (1999-2016) :: F250 - Power Mirrors Halfway Works

The power mirrors on my F-250 works halfway. I can get them to move inward but not outward. They also will upward but not down. These are both mirrors. Could it be the switch?

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Ford Super Duty (1999-2016) :: F250 - Blower Works Sometimes Then For No Reason Stops

1999 F250 .. Blower works some times then for no reason stops. When it works, I have all speeds, it makes no odd noises. I shut the engine off and then it does not work. I have power to the blower motor even when it is not working. I doubt it is the speed resistor module because that is not used in high speed. I've taken the blower motor out of its housing and pulled the resistor module as well. I find nothing wrong, power it up and the blower works. I put it all back together and it does not work.

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Ford Super Duty (1999-2016) :: Back Up Camera Works Only When Interior Lights On?

Dome light stays on drive over 15 mph lights turn off back up camera works when lights off lights on no back up camera 1999 f350 super dutuy

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Ford Super Duty (1999-2016) :: Start Truck No Gears / Restart And Tranny Works?

2002 sd 7.3 4x4. When I start up engine and put truck in any gear I get nothing but the ugly clicking sound when I shift back into park. Turn off engine and restart, everything works as normal. Doesn't do it every time 4-8 normal start ups then a bad one. Brought it to a tranny guy, head scratcher for him. Any other solution before I start changing parts?

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Ford Super Duty (1999-2016) :: 2001 F350 - Blower Motor For AC / Heater Only Works Sometimes

2001 f350 blower motor for (A/C - Heater) works sometimes and sometimes does not.

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Ford Super Duty (1999-2016) :: Window Washer Works Intermittently Although Motor Is Fine?

So either these trucks have a super small window wash reservoir or there is something wrong with my truck. The window washer works just fine and then stops. The washer motor is still working but nothing coming out. I fill it up to the top again and suddenly it works just fine. The thing is that when I fill it up it only takes between 1 and 2 quarts of water. I'd imagine the recover probably holds close to a gallon so not sure why mine quits working and then is full after 1 to 2 quarts of water is added. Perhaps the pickup tube in mine is bent or something? No light or message on the dash...it just stops.

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Ford Super Duty (1999-2016) :: 2002 F350 - 4x4 Works But Dash Indicator Not Working

4x4 dash indicator light stopped working on my father's 2002 F-350 V10 about 8 years ago and I'm trying to see if I can fix that problem.

Unsure exactly when this problem began, but when a mechanic replaced front wheel hub about 8~9 years ago, automatic hub lock stopped working. Back then, I thought that is why 4x4 indicator stopped working.

When I removed hub to replace ball joint 2 years ago, I discovered yellow O ring was not installed and that was the reason why automatic hub lock stopped working. Now I installed new O ring and vacuum seal, automatic hub lock works. However, 4x4 indicator on the dash still does not work.

I thought may be bulb went out, but when I tested dash bulbs with self test mode, 4x4 indicator light turns on. Also I believe that lamp is LED not regular bulb.

When I pulled DTC, I get P1879 - Powertrain Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure. From what I searched this indicates failure at vacuum solenoid for front hub locks, but it is working fine. What is going on?

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