Ford Super Duty (1999-2016) :: Heat Only Works At 70 Mph But Not While Idling
Dec 24, 2013
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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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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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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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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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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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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Just noticed something funny yesterday while flushing my radiator. I have an 04 F350 with the 6.0. When I have the heat set to come out both high and low vents, the A/C compressor also kicks on. The pipes by the passenger side firewall get cold. If I set the heat to just come out high or low, it turns off. This is not with the defroster on. Why does this happen? Is it supposed to happen?
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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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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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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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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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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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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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2001 f350 blower motor for (A/C - Heater) works sometimes and sometimes does not.
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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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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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I bought a used 99 f250 v10, i went to turn on the a/c today, and it only blows where the defrost is toward the window. it gets cold after awhile, but nothing out the vents, the heat either.
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2002, F250, 5.4, ZF6, 140k.
My heat only blows through the defroster. I was looking for my vacuum pump, but can't seem to find it. I find plenty of diesel threads where they show it, but mine isn't in the same location. I can actuate the diverter by hand and it will make the heat stop at the defroster and come out at your feet.
I have attached images of my rig.
Were to look for the vacuum pump? Any key spots to look for failed vacuum lines? What is this?
This is where most threads say the vacuum pump should be.
This switches from defrost to floor when operated manually.
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My heater stopped working.
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I was wondering if there is a aftermarket product to give my truck a more Rumble when starting and idling.
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I am new to Super Dutys but i love them! Altho mine is not being so nice. It has the 5.4 in it. When its idling it has a stumble to its idle with a pop every now and then out the exhaust. It revs fine when its first started. If i pull out on to the road and start away easy its ok a slight miss but if i put the throttle down its just falls on its face. But if i get it up to cruising speed its ok as well. But even at cruising speed more then 1/8 throttle and it starts missing and falling on its face. What it could be? It smells like its running lean as well.
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