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I will still have to be able to positively identify where the problem source is, but I'm suspecting the front heater core now as the times I was smelling antifreeze it was coming from the front, but I couldn't find any leaks.
The Ex has a single a/c compressor even with dual front/rear heat/a/c.
There is a special vacuum actuated valve on the heater hose (right next to a/c compressor up top). In MAX a/c mode this valve blocks hot water from reaching the heater cores, thus increasing the cooling effectiveness since the heater isn't as hot.
Water pump impeller, (intermittent) frozen a/c compressor, faulty wire to fan could all cause overheating... but an intermittent problem is tougher.
I was just watching a Youtube video about the vacuum system and one common almost common denominator is engaging 4wheel drive. I don't remember ever engaging 4 wheel drive on Friday, but most definitely in CO and on Saturday. I will try this out tomorrow while driving around town. I know the vacuum system controls the heater valve, but how would this cause the truck temps to rise. I get how it would mess up the A/C and heat, but not how it would effect engine coolant temps upward
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