1997 honda passport
3.2v6
1.at idle the temp needle rises and drops automatically at acceleration
2.changed the thermostat.....still did it
3.changed the fan clutch.....(this is my dad's car so he bought that. Id have saved my money and tried something else.)
I've narrowed it down to water pump......(vehicle does not make excesive noise which I would attribute to a faulty water pump)
ANY INPUT WILL HELP