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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.