Our mechanic is stumped. The Frontier runs hot when idling. The clutch fan and thermostat have been replaced. The radiator has been flushed. When you are driving or you turn off the A/C, the temp goes down. The next suggestion is to replace the radiator, but I’m already hundreds into this so I hate to do anything else unless I’m pretty sure it is going to fix it. Help!
We do know that the catalytic converter needs replacing. Could this have anything to do with it?