07-05-2009, 04:10 PM
to make it short i have an 01 trd v6 ext cab tacoma. towed a jet ski on a four hour trip. when my truck sits in traffic or around town my engine runs at the normal running temperature. but when im on the highway between 65 and + the temp gauge gos from normal temp up to almost in the red then back down then back up and keeps fluctuating. if i let off the gas for while or coast down hill the temp gauge will eventually come back down. im thinking i need to flush the coolant, (which is full by the way) and replace the thermostat. anybody else ever have problems? anything else that it could be? thanks for the help.