Over Temp Warning Came On??
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Senior User
Joined: Jan 2016
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From: El Cajon, Ca
Over Temp Warning Came On??
I need some advice on an overheat issue I experienced recently. So here is the scenario, 2016 CC 6.2 4.30 pulling a 6500 TT. We have been camping in the same area for many years in the Eastern Sierra’s of California. To get there we have to pull a grade that is 14 miles long and has a 6% incline. I have used this truck on the grade probably 10 times over those years without an issue. It is always about a 100f when we go and the load of the trailer and truck are always the same. This year about ¾ of the way up the over temp warning came on the dash, I immediately turned off the AC and slowed down significantly. After about 2 minutes the warning went away and the temp needle returned to normal. I have never had this happen before. I just got the truck back from Ford and they cannot find a reason for the over temp alarm. The only difference in the truck is I recently went from 285/65/18 tires to 275/70/18. The result of that is I was pulling the grade in second gear vs third that it usually takes to pull the grade. Could that be enough to cause the over temp alarm? Looking for thoughts/advice.
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Joined: Aug 2008
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From: Frederick, MD
Yes fan on high at first start up. Perhaps if you take off right away you should really here that too.
So moving on, if your guage is working correctly then if the coolant is not low, maybe thermostats are an issue?
So moving on, if your guage is working correctly then if the coolant is not low, maybe thermostats are an issue?
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Senior User
Joined: Jan 2016
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From: El Cajon, Ca
I can only go by what the Ford tech told me yesterday that the entire system was checked and all features where working correctly. This is the same dealer when I took my Escape in for an obvious coolant tank leak they changed a motor mount and gave it back without fixing the leak. I'm doing my own research to try and diagnose this issue. I believe it is fan related. thanks for the advice I will check out the fan at startup and see what is happening.
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Laughing Gas
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Use Forscan to 1. monitor the live data from the fan while you drive around, watch the commanded vs actual RPM and 2. command the fan to 100% duty cycle then watch the commanded vs actual RPM.
That would at least tell you whether the PCM fan clutch is working as expected.
That would at least tell you whether the PCM fan clutch is working as expected.
Mountain Pass
Joined: Jan 2018
Posts: 179
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From: Salt Lake City
I ended up flushing the coolant system- the problem went away and that was 50k miles ago. I sense something went sour with the coolant, and erroneously trigger the temperature sensor. I know hard to believe.
Flush the coolant. Super easy to do. And see what happens.
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Senior User
Joined: Jan 2016
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From: El Cajon, Ca
I can believe anything in theses trucks now days. The hard part is it has only happened the one time. I have pulled the trailer since the incident, but not anything near the hard pull that we where on when it triggered. I'm trying to be proactive, but maybe I should just wait and see if it happens again. After all this is 2020!!!!!
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