Losing some coolant. Never overheats. Coolant hoses stay hard and tight overnight and overflow tank hold pressure. (Yes, I know it could be a head gasket but no signs of coolant in the oil)

Had the upper,,lower coolant hoses off and ran water through looking for blockage or something. Nothing.

Put it back together, refilled the coolant, did an initial coolant air purge. Went for a drive, got good cabin heat.

Oddly (to me), the lower rad hose is barely warm, upper hose is scalding hot.

Likely the thermostat has failed or should I not jump to conclusions?


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