Ford 6.0L Power Stroke Diesel :: Cooling Fan Spun Too Fast
Jul 5, 2017
My truck was parked at home and hadn't been started for 10 days. When I did start it for the first time, I heard the cooling fan spooling up or down, consistent with the engine rpm. After pulling away from my home I saw the fan speed spool up to near 2,800 rpm during the short period it was locked-in with the engine speed.
While driving out of my neighborhood, and about 1/3 of a mile from my house, the fan returned to normal speed of about 480 rpm. I have the FSS pid displayed on my Scangauge and was able to see the fan speed while hearing it. Now I know what the fan sounds like at a high rpm. It makes quite a roar.
This has never happened before. I've driven the truck a few times since then and it hasn't occurred again. What may have caused this?
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I recently bought this Ford F250 6 with 117k... I've had it 3 weeks and it is now at 120k... My Odometer is reading Fast. From Tucson to Phoenix it read 302 mi, on my trip monitor it read 102 mi.. I've made this trip many times before and 102 miles is about right. It's a big issue because I get paid by the mile.
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Under normal driving, my cooling fan rarely comes on. The truck runs ECT 194 to 200 and EOT about 7-8 degrees warmer. On grades in the mountains, not towing, it will cycle on if the ECT gets to 210, cools it down and cycles again if needed. My question is, under similar conditions, what does your truck do? When towing my 5th wheel, about 13k, when its 90 degrees plus, at between 60 and 65mph on level ground, my ECT runs 210 and the fan comes on to around 1400rpm and cools it back down to about 204.
When the ECT gets back to 210, the fan does the same. On uphill grades, I see as much as 220 ECT. When this happens the fan comes on at around 2500rpm and cools it down to about 199 pretty quickly. I have a new oil cooler so my oil always follows and on my last trip I never saw more than EOT of 225 on the longest, steepest grade. The reason I ask is to see if this seems normal. My mech keeps mentioning that if my fan is cycling it may be head gaskets. But, I don't have any other head gasket symptoms. I think it seems pretty normal. If the fan doesn't come on and cool the engine when its working this hard, then what is it for? What does your truck do under similar conditions?
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The 2011 Platinum's "black" interior is really chocolate in color. This just killed a potential sale today. But I did drive it and it didn't dissapoint. Probably out of my price range,but if money wasn't and object, probably would go for the loaded blk. 4x4 Platinum.
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Fast idle 6.7 when cold remote start. My GM had what could be called a auto fast idle when it was cold it idle a lot faster.
It appears my 2012 f350 does not , Ford dealer said he could install a fast idle using one of the switches.
And then if I park truck with park brake on and switch on it when I start it will fast idle to around 1300.
My question is being if truck is started by remote , will not this switch be off and by being off fast idle will not work , is this not the case?
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getting ready to do a cooling system flush per the instructions Cheezit posted a while back, which say "refer to Cooling System Draining, Filling and Bleeding in this section." I think I can figure out the drain and fill but how do you bleed the system?
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I have a 2003 6.0 Exc. I have installed an external "Bullet Proof" oil cooler, and essentially all of the "bullet proofing" accessories with the exception of head studs. I also have installed a Mishimoto oil cooler, as the OEM cooler had a crack in the upper tank, My particular problem is that the cooling fan does not kick on (audibly) until about 230 deg or so. It quickly cools to about 215, and the fan kicks off (audibly). On the long uphills here in AZ, it will repeat this process, sometimes getting as high as 240deg.
(As monitored by my EDGE tuner) I have utilized the blue-wire-to-ground trick noted elsewhere, manually turning the fan on myself, and that works great. What I'm asking, is what sensor sends coolant temp to the ECU, ( and where is it located in the cooling system) which in turn determines how much to turn the cooling fan on? What typical level the sensor sends to the ECU to control the fan? I would like to put together a circuit that "fools" the ECU into turning the fan full "on" at about 210 deg, and stays on until the coolant temp reaches 195 or so. I would like to check that sensor first, and make sure it is working correctly before I try to band aid a fix.
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2006 F350 6.0 throwing code P0480 and I'm having a hard time figuring anything out pertaining to my truck. Trying to figure out what exactly it is and how to fix it myself.
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I currently have a 2003 F-250 6.0 with 112,000 miles on it. While traveling interstate speeds (70+) and the I can hear the cooling fan rev up and down every 10-15 seconds. Is this normal?
Also when it spins up, it sounds normal then make a high pitched squealing noise. Thoughts?
I am also needing to rebuild the fuel bowl. I noticed DieselOrings offers rebuilds for the 7.3 but not the 6.0. Will these fit or any suggestions on parts?
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My engine cooling fan came on when I first started the truck, was reading of 2k on torque app, ECT was appx 100* with the EOT a little cooler after about 5-10 minutes things went to normal around 600 rpm. It did not happen anymore during the drive, I was seeing about 192* ECT and 198-200 EOT. I let her set for 2 days and took her to town and the fan was at normal RPM's, Is there any problems or is that normal?
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I noticed my A/C hasn't been up to par. It's not bad when driving but just ok when idling. So today I changed the orfice tube and the accumulator. Vacuumed the sys. down and charged it up, 2 lbs 10 oz. It is worse! the compressor kicks on and off constantly only cooling to 80 degrees.
I noticed the high goes right up to 350 then the compressor shuts off .... 7 seconds later, back on and up to 350lbs and off again. I think the high-pressure switch is shutting the compressor off before anything goes kaboom but why isn't my fan cooling the condenser down? my FSS shows no increase in fan speed. Sitting at 450.
I think I'm going to cool the condenser down with a hose now to see if that works. If so, That would be telling me the fan isn't doing it's job correct?
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My truck is a 2004 F350 6.0 as with most of the ford diesels from this era it has hydro boot brakes.
Under normal braking the truck felt fine and the brakes behaved as they always have. However if you where to depress the brakes hard, as if making an emergency stop, the brakes would not lock up in the way they did when I bought the truck two years and 80,000km ago. The problem was slow to appear and at first I blamed it on the larger tiers I was running (stock 2012 F350 wheels and tires (yes the offset is wrong)) but after switching back to my stock wheels for the winter I knew that something was not right. It was something I could live with, it did not make the tuck unsafe it was just that it did not stop as well as I knew it could and this avowed me. I replaced the front and rear calipers and when that had no effect I swapped out the master cylinder this still made little difference.
I drove the company truck all of last month (2008 GMC 2500 Duramax) and when I got back in mine I realised that I had to chase down the problem. I did a lot of reading online and after thoroughly flushing and bleeding my brake system I narrowed my problem down to either the hydro booster or the power steering pump. The plan we came up with for diagnosing was:
1. Thoroughly inspect for PS/Hydro boost and brake fluid leaks following the procedure found here Hydro-Boost Power Assist Systems: Operation Diagnosis and Repair
1a. Consider bleeding the brakes as a bit of trapped air would cause your symptoms.
1.b Consider flushing the PS system. Some suggest this works with tough steering.
2. Have a shop check the PS pressure is within spec. (assuming this is cheaper than buying the tool or just replacing the pump) If it is low, replace the PS pump.
3. If PS pump is fine, or is replaced and the problem is still there, consider replacing the Hydro booster.
It is not super complete but it was a place to start. We checked for leaks and found nothing. The pedal would not sink under braking but would say firm meaning the brake system was free of leaks.
I began a rudimentary test of power steering pump. With the truck in the drive way I could easily turn the steering wheel however, applying the breaks about half way would make turning the wheel imposable. This led me to believe the power steering pump was starting to go. The next step would be to have the pump tested using a power steering pressure gage or take the truck to a shop to have it tested. I found the pressure gage to be more expensive then the new pump so went that way. With 350,000km on the truck I figured it was not a bad thing to do even if it turned out to not be the cause of the problem.
It is a bit tricky to get the power steering pump out but after pulling the radiator line under the truck I could drop the pump out the bottom. The new pump went back in the same way and after a full flush and bleed of the system it was time for a test. What a difference! The truck stops like the day I got it. If your symptoms are like mine I would recommend you check the power steering pump. If it is the problem it is a lot cheaper then replacing a master cylinder or calipers.
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Noticed this past month on colder days my upper hose is collapsed, typically a symptom of a bad radiator pressure cap.
This hose is connected from the water pump to the radiator. The radiator is connected to the Degas bottle which has a nonstandard radiator cap.
Do these plastic caps vent the same way a typical cap does?
Cap for 2011 Ford F-350 Super Duty|9C3Z-8101-B
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Late build 03 f350 auto, I got a p0500 code and noticed sometimes after 2rd-3rd gear engages theres a shudder or fast vibration for few secs unless i let off, it didn't start this till i took batteries out, where is the location of the vss at, I am seeing some say at each wheel, on top rear diff, on top back of trans so not real sure?
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6L w/automatic trans,no tunes,no mods. Fan doesn't speed up when ac is turned on. I checked connector at fan shroud and #25 10a fuse and wanted to see if there's anything else I can do or check before taking it to dealer. I haven't towed heavy since I noticed ac not cooling at idle but last time I did tow the fan ramped up on hills and stop and go. I'm in Texas so I must get this right asap. I heard of some with manual override so I would like to do that as well but also heard rumors the override can damage pcm. Any manual override?
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Here is the issue i am having. 2011 F-350 King ranch with all bells and whistles. In Arizona now we are in the season that the weather is cold in the AM and sometimes hot enough in the late afternoon to need the A/C in the truck. with the settings on Auto which i normally do, and the external temp reading in the 80s, and the internal thermostat set at 70 or lower, the A/C compressor will not engage and allow for cooling the cab of the truck. But sometimes it will work just fine. I am assuming there is a temp sensor for cabin temperature. Where that is located. or will i have to change out the entire Climate Control Module. I would take it in to have it checked out but it is an intermittent problem, and i cant not have my truck for a couple of days while they try and figure it out.
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Turns out I've lost nearly all of the coolant from my secondary cooling system and am trying to diagnose the problem.
Things I noticed:
-All of the hoses appear to be in good condition.
-Coolant is dripping from the center of the engine bay.
-After inspecting the turbo area, it appears the valley below the turbo is wet.
The intake manifold is still on the truck, so I haven't been able to get a better look. Is there anything else near the area I am describing that has coolant? My guess is the turbo water inlet?
Perhaps this : Coolant leak on the 6.7 Powerstroke diesel - YouTube...
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I have a 2007 6.0 that this has happened to twice now. It's fine around town but I never hear the can come on. Friday when on the interstate my my temp gauge started to rise past normal operating temperature before fan came on. Is this normal? After the fan came on it stayed at normal temp for the rest of trip....
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2002 f250 7.3l diesel...
I got a new radiator and the tranny fluid was the worst the mechanic had ever seen. He serviced it and warned me that it might not be long for this world. I broke my flexplate and so I had to pull the tranny, and I decided to throw a new torque converter in because it was giving g me symptoms like a broken sprag( it wouldn't rev up or do a brake stand in gear, therefore slow takeoffs).
I was recommended to replace the tranny, I decided I could do the job again down the road if I needed to. About two thousand miles down the road I had a hard shift going from overdrive down to get up a hill and about 10 miles later the truck started slowing down....I couldn't give it enough pedal to keep it going and the engine sounded rough.
I pulled over and checked fluids and everything was fine, truck idled fine, bright red tranny fluid not burnt at all. Pulled on to the road again and it pulled fine until about 40 mph and it wouldn't go any faster. I got it towed home and ordered up a tranny from Ford figuring it must be toast, but I thought I'd throw it out to the forum to see if there is any other troubleshooting I can do before I install the new one in case it is some other problem or some electrical harness or something, or if that is a pretty standard reaction to a fried tranny.
Engine runs good at idle, shifts perfectly to drive and reverse, drives forward and back(I'm very hesitant to drive it out of the driveway in case I can't get it back in). Only happened two times before I decided to tow it. Temps looked fine on the gauges, fluid was a little overfilled in the tranny, but again, not hot or burnt.
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I have a 2006 Passat 3.2 and a while back, I noticed that it would take the AC a very long time to cool, once it got temp down, it was fine. I checked low pressure and it is just perfect. I noticed, once car would cool down, and one gets to read light, after being stopped again, ac tends to get warmer. AC fan seems to be running fine and no errors on Computer. Miles 105,000
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I am having trouble getting my 2000 7.3 (200k) to start on the colder mornings. It will crank over fast, but won't start without a lot of tries. Today it took 6 pre-heats and cranks, but on others (and colder days) it has started easier. It does seem to be getting worse though.
I have replaced the glow plug relay recently so it *shouldn't* be that unless the replacement is fried. Starts fine the rest of the day and drives fine, but not in the cooler am (it was about 34 this morning). I also tested the batteries yesterday and while they aren't new, they tested okay.
Also, I read (briefly) about the CPS, but forgot to watch the tach this morning, but did notice it is pushing smoke out when turning over.
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