2000 toyota tacoma

please give me clues should I replace my thermostat and temp switch if things show they are getting hot but everything looks normal under the hood???

 

it showed yesterday tht it was hot going up a hill but goes up and down on the dash under the hood everything looks good should I just replace the thermostat and temp switch???

 

water pump not leaking radiator full hoses look good clean air filterno leaks at all belt not slipping with a/c on going up a hill in 103 degrees temps outside ny truck almost got to the red but now just sorta goes up and down runs kool on flat levels do you think the temp switch and thermostat should be the problem????