heat gauge near "h"

just got a call from a relative in conn. whose heavily loaded (he's moving)'97 mazda protege's heat gauge is approaching "h" on hills,
although running normal -- middle of gauge -- on highway. no coolent loss or fan-felt squeal. a.c. is not being used. air temp. about 80 degrees. anybody experienced this? cause for worry? thanks any imput. art
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