Heater core & silicate gel
I'm going to do a coolant flush soon (just ordered 4 jugs of Rotella Ultra ELC concentrate). I am wondering if the silicate gel that plugs the oil cooler also collects in the heater core. Or does the silicate just precipitate out where the most extreme heat is concentrated like in the oil cooler/EGR cooler area? My cab heat fluctuates a bit between uphill and downhill driving. I'm wondering if a good flush will improve this.
Regarding the flush procedure, would it be acceptible to do the complete flush in the shop? We have extreme cold here this time of year and I don't want to take a chance doing the driving phase of the flush when it is this cold (-18C). Could I run the Restore and Restore Plus phases at high idle with the t-stat out for an hour with the rad covered to keep the temps up? Thanks in advance for the advice.