[ZMEnow]

Originally Posted by lrramboe

Hi,
Last year I experienced some running hot symptoms in my 2013 ZL1. Currently it has 23K miles, mostly stock. Dealership could not duplicate or address the 213F to 245F verified engine coolant problem, additionally the A/C shut down( stopped cooling) when the engine reached 225F degrees. Compressor engaged after engine cooled down to 215F degrees. Before retirement I worked as a ASE certified Heavy Equipment tech and shop foreman so I am not inexperienced. Maintenance since purchase (9600 miles) has included ALL hoses, performance belts, T/stat, coolant w/ distilled water mix, and so on.
Question I have is:
Any recommendations for a larger radiator, as in where to buy it?
Normal cooling diagnostics have been performed, Thermostat working, Fan(s) cut in/off settings, Coolant analysis and oil analysis too, no headgasket leaks or any other problems noted. Maybe I'm being a little anal but here in Phoenix AZ. A/C is considered essential during the summer and I do not want to shorten the life of my engine. Open to suggestions!
As a footnote the intercooler, a/c condenser and radiator are bug free with no blockage. Simply added some aluminum screen to act as a bug, rock and other debris shield, old trick from heavy equipment working offroad. Maintenance has been far superior than recommended including ALL fluids changed out based on time rather than mileage. Also did/do a fluid analysis on everything serviced. Old habit again from working on off road vehicles. So I'll be the first to admit I do not know everything so HELP?

LSA's blocks are notorious for cavity block, the GM spec requires that your negative pressure fill. I use a MAC tools negative pressure filler. If you don't have a reservoir on the SC it should be negative filled as well but that's not going to cause the block to overheat.