Turbo Spooling
Elder User
Joined: Feb 2009
Posts: 950
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From: nc
Still could be the fan. There is a sensor or something that can go bad and cause this issue. My truck does this if its hot and sits in the sun then i crank it up. It starts when i apply throtlle then ends after 20 seconds or so. It is very loud and sounds like a jet taking off and increases with throttle. You may have a bad thermostat.
Senior User
Joined: May 2009
Posts: 137
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could be thermostat, bad fan motor, a few things can cause fan to stick on. if your turbos were making that much noise you would have to have a hole in pipe or ur intake slipped off the turbo inlet which would def throw a code on the truck.
New User
Joined: Jan 2009
Posts: 18
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You guys have me thinking now. I have the same issue and I thought it was the turbo spooling also. It doesn't happen all the time, and doesn't only happen when it's hot. At times it happens within the first few minutes of the truck being started. It seems to happen more when I have a load on the truck putting it up a grade. The power is like it almost cuts way back. It seems to help if I back out of it. I took it into the dealer and they are telling me everything checks out fine. So you guys are saying this might just be a thermostat issue?
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Senior User
Joined: May 2009
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yeah because under a load especially uphill the ect and eot and egt's go way up causing heat issue and loss of power with the fan motor running hard to try and fix it. also when the truck is first starting the motor is cool so the fan motor shouldnt be running like that which a thermostat issue can cause
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Super Moderator
Joined: Aug 2003
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From: Isanti, MN
yeah because under a load especially uphill the ect and eot and egt's go way up causing heat issue and loss of power with the fan motor running hard to try and fix it. also when the truck is first starting the motor is cool so the fan motor shouldnt be running like that which a thermostat issue can cause
Originally Posted by Ford Service Manual
the actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. The valve is activated by a pulse width modulation (PWM) output signal from the PCM. By opening and closing the fluid port valve, the PCM controls the fan speed. Fan speed is measured through a Hall effect sensor, and is monitored by the PCM during closed loop operation. The PCM optimizes the fan speed based on the engine coolant temperature, the engine oil temperature, the transmission fluid temperature, the intake air temperature, or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase. During the key on, engine running (KOER) self-test, the PCM commands a 100% duty cycle. A DTC is set if the PCM detects the voltage on the valve control circuit is not within the expected range or if the fan speed is less than a calibrated value.
New User
Joined: Jan 2009
Posts: 18
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Most of the time I will back out of it when it happens. That seems to help a bit. I've had it into the dealer two times now for this issue and they keep telling me they can't find anything wrong with the truck. I think now that it might be a heating issue I can go back in and have them check it out. If they plug it into the computer will something show up? It would be so nice to fix this issue.
Super Moderator
Joined: Aug 2003
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From: Isanti, MN
Oldguy, did you read my post?
When it kicks on, is it at low speed with the A/C on? My work truck does this, and it drives me NUTS! Of course, my work truck is way bigger than a super duty, and the cooling fan sucks nearly 75 HP to turn, which makes for slow going getting back up to speed again. To avoid it, I switch off the A/C when I'm going slow.
Our Super Duties do the same thing...it's simply to provide you with a/c on hot days. Without air flow through the condenser, there IS NO A/C...therefore when you're going slow it kicks on the fan simply to get your A/C going...
When it kicks on, is it at low speed with the A/C on? My work truck does this, and it drives me NUTS! Of course, my work truck is way bigger than a super duty, and the cooling fan sucks nearly 75 HP to turn, which makes for slow going getting back up to speed again. To avoid it, I switch off the A/C when I'm going slow.
Our Super Duties do the same thing...it's simply to provide you with a/c on hot days. Without air flow through the condenser, there IS NO A/C...therefore when you're going slow it kicks on the fan simply to get your A/C going...
New User
Joined: Jan 2009
Posts: 18
Likes: 0
Oldguy, did you read my post?
When it kicks on, is it at low speed with the A/C on? My work truck does this, and it drives me NUTS! Of course, my work truck is way bigger than a super duty, and the cooling fan sucks nearly 75 HP to turn, which makes for slow going getting back up to speed again. To avoid it, I switch off the A/C when I'm going slow.
Our Super Duties do the same thing...it's simply to provide you with a/c on hot days. Without air flow through the condenser, there IS NO A/C...therefore when you're going slow it kicks on the fan simply to get your A/C going...
When it kicks on, is it at low speed with the A/C on? My work truck does this, and it drives me NUTS! Of course, my work truck is way bigger than a super duty, and the cooling fan sucks nearly 75 HP to turn, which makes for slow going getting back up to speed again. To avoid it, I switch off the A/C when I'm going slow.
Our Super Duties do the same thing...it's simply to provide you with a/c on hot days. Without air flow through the condenser, there IS NO A/C...therefore when you're going slow it kicks on the fan simply to get your A/C going...
