No Heat this morning
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Joined: Jun 2014
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No Heat this morning
So I have a 2011 F350 6.7 and it was a nice balmy -22 this am. Well started the truck, no issues until I got in it. No heat..I have the electric which did not work nor did my normal heat when I was driving on the highway. Froze my butt all the way to work. Any ideas on where to start other than just bringing it into the shop. Fuse that could effect both? Just too damn cold?
Thanks in advance!
Thanks in advance!
Cargo Master
Joined: Sep 2007
Posts: 2,470
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From: Chandler, AZ
-22! Its going to be 80 today so I rode the motorcycle. 
Maybe its possible that the ECU won't allow cabin heat when the engine temp is extremely low (trying to warm engine only).
Maybe its possible that the ECU won't allow cabin heat when the engine temp is extremely low (trying to warm engine only).
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Logistics Pro
Joined: Mar 2005
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From: West Michigan
So, if the blower did come on, then I would have to ask that you check your coolant level. If it is low, you usually will not get heat. As for supplemental heat, it may have been too cold to notice it, as it is more for quickly unfogging your windows vs real cabin heat. How far did you drive the truck?
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From: Panama City, FL area
So, if the blower did come on, then I would have to ask that you check your coolant level. If it is low, you usually will not get heat. As for supplemental heat, it may have been too cold to notice it, as it is more for quickly unfogging your windows vs real cabin heat. How far did you drive the truck?
I have always found that my supplemental heat works best when the recirculate switch is set to recirculate, and it does a good job of heating the cabin before main heat really starts working.
Here is a little info on the supplemental heater (from 2010 Ford Super Duty Workshop Manual)
Auxiliary Electric Heater
An electric heater is available as optional equipment on diesel vehicles. The electronic heater assembly contains the Auxiliary Heater Control Module (AHCM) and element, and is located in the HVAC immediately downstream of the heater core.
Power is supplied to the AHCM element through a fused cable connected directly to the positive battery terminal with an in-line connection at the dash panel heater tube opening. Ground is supplied to the electric heater element through a ground cable connected directly to the negative battery terminal with an in-line connection at the dash panel heater tube opening. The AHCM is activated by a Medium Speed Controller Area Network (MS-CAN) message from the HVAC module — EMTC or HVAC module — DATC . The MS-CAN message is converted to a HS-CAN message by the Instrument Cluster (IC) module and is then detected by the AHCM .
The electric heater will be activated if all of the following conditions are met:
The ignition switch is in the RUN/START position
The engine is operating at greater than 500 rpm
Any ON mode is selected on the HVAC module — EMTC or HVAC module — DATC
The temperature set point is greater than 80% of the highest setting ( EMTC only, DATC uses software algorithm based on interior temp and set point)
The engine coolant temperature is less than 85°C (185°F)
No alternator faults have been recorded and alternator is not at full capacity
Lead Driver
Joined: Dec 2013
Posts: 9,762
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After you check the fuses. If you have a programmer or OBDII reader - reset the computers. I used forscan to do that on my 2011 when the A/C and heater wouldn't work and after it did its thing, everything worked again. You'll get to go through transmission adaptive learning again too.
Apparently Ford used a Windows OS to control things in the truck.
Interesting that after the coolant gets to 85F the Aux heater shuts off. I find that recirculate works better too, especially in the sub zero temps.
Apparently Ford used a Windows OS to control things in the truck.
Interesting that after the coolant gets to 85F the Aux heater shuts off. I find that recirculate works better too, especially in the sub zero temps.
Logistics Pro
Joined: Jan 2013
Posts: 3,778
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A lot of the trucks have remote start on them, my '11 did and so does my '15. It must be buried in some option package is my guess.
Why not just fire it up and let it warm up while you are shaving or something, does that work????????
Why not just fire it up and let it warm up while you are shaving or something, does that work????????
Lead Driver
Joined: Dec 2013
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FWIW, I have driven to a parking lot and had to wait for my kids to get out of class and while idling, I have watched the temp gauges on the IC move from almost the center to the cold mark on the left... This is where an SEIC would come in handy.
More Turbo
Joined: Aug 2002
Posts: 538
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From: Lansing, MI
It's 85°C (185°F) when it shuts off. I misread it as well the first time I read it and was thinking that 85 degress F was awfully low.
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Aug 1, 2011 04:27 PM