I am starting this open discussion to document the issues with my GX. Hopefully it will be helpful for others. I have noticed an abnormal consumption of coolant (2004 with 204,433K). It's "winter" here in Northern OH and my truck sits outside. It's a daily driver so I have cold starts every morning. The cabin heat is weak. I have no misfires, no white smoke from tailpipe. No coolant or gasoline smell (in cabin). No visible leaks on radiator. The water pump is new as of August of 23. Engine oil is normal in appearance but that doesn't mean coolant isn't leaking into the block. I'm hoping for a stuck thermostat. I inspected the truck up on ramps but didn't crawl around behind the water pump. I am dropping it off at my buddies shop tomorrow and will post updates.