I have a mitsubishi FG15 and the fork lift is over heating. When you put your foot on the gas and warm the fork lift you can see the temp gauge shoot up and go towards the red. It doesn't take much time to almost over heat by what the gauge says. When you let your foot off the peddle it slowly makes it way down on the temp gauge. I took out the thermostat to see if there is good flow threw the coolant system. From what I can see threw the top of the radiator it way flowing really good. I replaced the coolant temp sensor, it wasn't that. I checked the coolant system with a thermal temp gun and system was reading about 145F all the threw the coolant system. If anyone has any suggestions on how to check why it's over heating it would help out greatly. Thanks