while sitting in lovely chicago rush hour traffic, my coolant temp reached 236 and my eot reached 243. I immediately turned off the ac and cranked the heat to high to try and evaccuate some of the heat. this did help and after traffic cleard my coolant and oil temp returned to normal. I never once felt my fan kick in......Where do I start?.....Can I check if my fan is working properly with my scanguage?......Would my egr delete effect operation of my fan?.......Am I even sniffing up the right tree?

 

The EGR delete will only affect the clutch fan operation if the EGR valve has been removed, if the EGR valve is not plugged in the clutch fan and VGT operation will be affected. Were the temps 236 and 243?

 

Yes, Sorry, mt temps were 236 and 243.

 

Have you ever changed your thermostat? That is where I would start.

 

Sure. You can watch fan speed with this.
Fan Speed Sensor (RPM)

TXD: 07E022099F

RXF: 04620509069F

RXD: 3010

MTH: 000100040000

NAM: FSS

Some info from the Tech Folder:
Some say fan kicks on at 210, some say 215, others say 220. Full explanation: Engine temperature is not the only parameter that the PCM monitors to determine cooling fan operation. This is the reason that you will see some variation in engine temperature as it correlates to fan operation. The operation/description of the FSS (Fan Speed Sensor) from the PC/ED manual has a fairly good explanation as to how the system "thinks". This is not your traditional engine hits temp X and the fan clutch locks up. The fan speed sensor is a Hall-Effect sensor integral to the vistronic drive fan (VDF). The powertrain control module (PCM) will monitor sensor inputs and control the VDF speed based upon engine coolant temperature (ECT), transmission fluid temperature (TFT) and intake air temperature (IAT) requirements. When an increase in fan speed for vehicle cooling is requested, the PCM will monitor the FSS signal and output the required pulse width modulated (PWM) signal to a fluid port valve within the VDF. Engine begins to defuel at 221 deg. The thermostat begins to open at about 190*F to 195*F and is not fully open until about 215*F to 219*F..

Also some info on how unplugging EGR affects fan operation:
https://www.ford-trucks.com/forums/9...egr-valve.html

 

replaced the t stat a few weeks ago......Now what?....Guess I Need to find out why the fan isn't kicking in.

 

With all that said, why did the truck not defuel...what would cause the fan to not kick in?

 

Truck defuels at EOT of 253°

 

Maybe it it did defuel. It incrementally reduces flow, it doesn't really turn it off. Is EGR valve plugged in? Did fss work for you on SG? if so does fan rpm increase when temps start getting hot? Not having that info I could guess.

The connector for the fan is on top of the shroud. It's fairly common to have problems there corrosion in the connector, broken wires etc. inspect it all the way to the clutch. if you follow the harness Back around the thermostat housing, it goes right under the fuel pressure spring cover that can leak. Somewhat uncommon but on mine the leaking diesel had softened the insulation on the wires and they rubbed on the intake. The clutch could have failed also.

Don't forget the basics. We could be on the wrong track (this aint easy over the internet) Some water pump impellers have spun on the shaft, dirt combined with oil can significantly restrict airflow through the radiator etc, but fan speed should increase with engine temp.

 

Is the EGR valve in place and plugged in?

 

Thanx Rusty, All connections and wires appear to be good. How do i go about checking to see if egr is plugged in? ( egr delete was performed by local diesel tech and I have no idea what he did exactly)

 

Damage to the impeller also concerns me because there was green coolant in this truck for about a year. Oil cooler was replaced abot 50000 miles ago and I am seeing 15 degree deltas. I am really hoping some other issue is going on and not another plugged oil cooler

 

I cant get the short links to the 6.0L bible but here is the link to the full PDF manual, just scroll down to where it shows the components on the top of the engine and locate the EGR valve so you know where to look on yours, https://www.ford-trucks.com/ford-man...eTableBook.pdf