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Member
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88 Posts
Discussion Starter #1
I have a 2011 F250 6.7L SD Fx4 deleted with 5in exhaust and a mini Maxx. If I'm driving under 45 after about 30-40min or sit idle for more than 5 min my mini max goes back to stock and reads Defueling Hot Coolant and I notice my coolant/engine temp will rise to 215-233, but my oil temp never went higher than 210. As soon as I get out of stop and go traffic and back up to 45+mph my coolant temp drops back down to 179-184. Ive only had the truck for 3 weeks and this is the first time it's happened. The outside temp was around 84-88 degrees and I wasn't hauling anything or do any heavy hauling to begin with. Any ideas?
 

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Old Fart
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889 Posts
It sounds like your fan is not engaging when it gets hot. Have you had it scanned? Better find a good mechanic who can scan your rig.
 

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Junior Member
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274 Posts
either fan isn't engaging, or water pump isn't flowing enough, possible air restriction on radiator
 

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TDG MAFIA #101
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390 Posts
Does it do it when the truck is set to stock?
 
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