Join Date: Sep 2014
location: Charlotte Metro area
Thanked 118 Times in 83 Posts
It's potentially simple physics. Waste heat from combustion is transferred to the coolant, but, without sufficient fuel burning (idling) in very very cold conditions, there simply isn't enough heat to warm everything up sufficiently. Then again, there could be some problem other than a T-stat. But, if everything acts as you'd expect when the temps are more normal, I'm betting you aren't going to find any problem.
OH, by the way, the fans turning on may be in response to the air conditioner compressor cycling on and off. Turn that A/C off and see if the fans stop cycling on and off, too.
"Synthetic" is not a literal definition of a laboratory-created base lubricant, it has been a marketing term since the Castrol Mobil-1 lawsuit in the 1990's.
Last edited by Blackheart; 01-12-2018 at 08:01 AM.