What size load was it? Was it on the flats or 6% grade for miles? We need more details on the pull in order to help. 
Overheating problems
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Senior User
Joined: Jun 2008
Posts: 236
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From: Oklahoma
Overheating problems
My 07 F-350 was pulling a load and got up to 230 degrees a wile back. the fan never came on. I took it to the dealer and couldnt find anything wrong with it and the fan came on when they drove it. They also unpluged the edge box. I got it back and didnt have any problems till I pulled a load last week and it overheated again. I have it in my shop right now with the radiator and intercooler out of it cleaning them and was woundering if anyone knew what the problem is.
Thread Starter
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Senior User
Joined: Jun 2008
Posts: 236
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From: Oklahoma
no i run it on the tow mode when pulling. I think it is a problem becouse my 06's fan comes on at 206 and the fan never came on at all and i had to stop and un hook the 07 becouse it was at 230 and never came on. i had to get the old 94 7.3 to pull it.
Fleet Owner
Joined: Nov 2003
Posts: 27,881
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The fan on our 6.0L does not come on at one specific temperature - so I learned not long ago (thanks PowerstrokeHD).
FYI:
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 the sensor input 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.
FYI:
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 the sensor input 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.
Fleet Owner
Joined: Nov 2003
Posts: 27,881
Likes: 3,595
FYI - the engine is suppose to defuel at 227 degrees - so apparently the PCM did not think you hit 227. I assume the 230 value you quoted was with aftermarket gauges? If so, folks here with experience say they measure higher than the OBD-II readings: 10-20 degrees higher in many cases.
You say your truck overheated, but was it just the gauge reading or were there other signs (like puking coolant)? If it was just the gauge - what was the highest you had seen previously?
You say your truck overheated, but was it just the gauge reading or were there other signs (like puking coolant)? If it was just the gauge - what was the highest you had seen previously?
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Senior User
Joined: Jun 2008
Posts: 236
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From: Oklahoma
It was on the edge gauge. i beleve the highest it got to was 235 (it would of started puking coolant if i keep pulling im sure) and it never got higher than 209 befor this happend.
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Fleet Mechanic
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From: Henderson, NV
FYI - the engine is suppose to defuel at 227 degrees - so apparently the PCM did not think you hit 227. I assume the 230 value you quoted was with aftermarket gauges? If so, folks here with experience say they measure higher than the OBD-II readings: 10-20 degrees higher in many cases.
You say your truck overheated, but was it just the gauge reading or were there other signs (like puking coolant)? If it was just the gauge - what was the highest you had seen previously?
You say your truck overheated, but was it just the gauge reading or were there other signs (like puking coolant)? If it was just the gauge - what was the highest you had seen previously?
