I did a coolant flush on my 5.3 '03 Sierra and changed the fluid from green to Prestone orange coolant. I had mild overheating issues prior to the flush, so I figured flushing the coolant and changing to orange Prestone might help (I did the same exact thing in my '04 GTO with LS1 and haven't had overheating issues since forever).
Now the temp always goes above midway, and here's the thing... It does the same thing even on the HIGHWAY with fans on high speed, and it sometimes goes down in traffic only (basically when I'm not giving the engine any acceleration).
I changed the coolant again with dexcool, and did an air bleed, changed the temp sensor and thermostat two months ago, and cannot see any leak from the pump but still nothing is helping.
I'll note that the green coolant didn't look dirty when it I flushed it out, and that it only heats up when I'm accelerating.
Im sure this might have been covered someplace else but i couldnt find it. I have a 2015 gmc sierra 2500hd sle. The person who owned it before me installed cheap aftermarket tow mirrors and they jiggle all over the place on the highway. I would like to get some better quality mirrors. I'm just wondering if my truck supports the marker lights, blinkers, and reverse/cargo lights plug and play without making my own connections.
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