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Discussion Starter #1
Hey guys,
I need help understanding what is going on with my truck.
I have a 2006 F250, ARP studs, oil cooler, 4" turbo back exhaust, and EGR delete installed about 15,000 miles ago. A couple of months ago I installed an AFE intake on the truck. Since then the cooling fan would cycle anytime i was at low speed or had been stopped for a while. So, I pulled the intake off and put stock back on and it quit. Obviously it is intake temp that is causing my fan to cycle, but I thought the purpose of a cold air intake was to drop intake temps. Is that not correct???? I have searched on here and haven't been able to find anyone else with the same issue. Thanks in advance for your response.
 

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Did you do the egr delete the same time as the cac, unplugging the egr causes problems with fan operation. Mainly the fan not operating at 100% but this could be your problem, if you still have your egr valve plug it in and secure it in the valley somewhere.
 

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Beach Bum
2014 F250 CCSB 4wd
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Did you do the egr delete the same time as the cac, unplugging the egr causes problems with fan operation. Mainly the fan not operating at 100% but this could be your problem, if you still have your egr valve plug it in and secure it in the valley somewhere.
Can you go into more detail on why?
 

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Discussion Starter #4
Thanks for the reply.
The EGR was deleted when i got the studs, I had driven the truck for a year with the delete before getting the intake. I run a SCT with custom tunes that is suppose to fix that problem with the late model 6.0.

With the intake on and going down the road, even with a load on a hot day the cooling fan rarely cycles. But as soon as I stop or slow below 35 mph it will start to cycle. With the stock intake back on the fan rarely cycles at all.
 

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Can you go into more detail on why?
Its in the programming, ecu uses input from egr valve for fan speed, Matt at gearhead told me to leave the egr plugged in even with custom tunes. For the OP this is a weird problem, I haven't had any problems with my fan operation with my S&B installed. I would try egr valve first, are you throwing any codes with the cac installed?
 

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Discussion Starter #7
Also to clarify I have a short ram AFE intake with cone filter that is exposed under the hood. Temperature under the hood gets hotter when the vehicle slows thus making the intake air go up. I guess what i really want to know is: if the exposed AFE filter allows hotter air to be drawn in than a stock air box is there any advantage to having it??
 

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Beach Bum
2014 F250 CCSB 4wd
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Its in the programming, ecu uses input from egr valve for fan speed, Matt at gearhead told me to leave the egr plugged in even with custom tunes. For the OP this is a weird problem, I haven't had any problems with my fan operation with my S&B installed. I would try egr valve first, are you throwing any codes with the cac installed?
So is it worth buying a used then? bought the truck deleted.


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Discussion Starter #9
Ok, I'll try plugging in the EGR valve and see if that makes a differance with the intake on.
Thanks..
 

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Very well could be IAT, do you have a monitor? Ecu might be kicking the fan on from pulling in hot air.
 

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We really need to see some recorded numbers to determine just whats happening. You should have some sort of monitor anyway but thats another discussion.

If we had your ECT, EOT, and IAT then we could get down to a definite answer as to why your fan keeps kicking on :thumb:

How is your coolant level?
 

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So is it worth buying a used then? bought the truck deleted.


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I know what the heat is like in Texas if your having problems with your truck getting hot it would be a good idea.
 

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I had the same problem, after i did my egr delete. mine is an 05,. I had to plug the egr valve back in. It helped mine while i was just driving unloaded, but my fan ran almost constantly while towing my 5th wheel. My oil temp was reading around 220 and higher sometimes. Kept puking out of the degas bottle. I ended up installing a new oil cooler, and havn't had any problems since.
 

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I think the fan does kick in with higher IAT.....I know mine does, even when my coolant is 190 and my oil is 193.
 

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Also to clarify I have a short ram AFE intake with cone filter that is exposed under the hood. Temperature under the hood gets hotter when the vehicle slows thus making the intake air go up. I guess what i really want to know is: if the exposed AFE filter allows hotter air to be drawn in than a stock air box is there any advantage to having it??
Were you looking for more performance when parked? Mine does the same thing but it cools down again as soon as I start to move and thats the only time I care about cold air.
 

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Hmm interesting. I've never heard of any issues such as this. But I would be calling up afe and asking them about it. 06 is back to a mass air flow sensor if I remember correctly. Do you have the sensor installed in the proper direction? Do you have a way to monitor your iat_1 temps and see what they are reading?
 

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I borrowed this out of the Ford powertrain control book:
The PCM optimizes the fan speed based on the engine coolant temperature ( ECT ), engine oil temperature ( EOT ), transmission fluid temperature ( TFT ), intake air temperature ( IAT ), 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.


My best guess is that it's drawing hot air from in the engine compartment when you get to slow speeds.
 
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