Ran out of solutions for overheating

[rally.up.raph]

I've been experiencing overheating issues with my 2006 Nissan Titan for a very long time now since leaving it idle in our driveway one afternoon.

I had some suspicions on what could be the problem and I've tried fixing it myself. I've made a few replacements already - fan clutch, thermostat, water pump, radiator cap, and overflow cap. I've checked the radiator for clogs but it was flowing well, and I just had it replaced last year so it's pretty new. I've also done extensive system bleeding but nothing seemed to solve it.

My truck still overheats when it's idle but it cools down when I drive. I've just been taking it around the city for short drives and errands, 'coz I don't want another headache when it acts up while I'm out of town!

What could have gone wrong? Anybody else ran into a similar problem?

 

[bloodyhand]

Have you noticed any missing shroud on the fan? If a shroud is missing or damaged the airflow will drastically drop. Another thing that's crossing my mind is gunk or bent fins between the condenser and radiator can also drop the airflow. You should check those things.

 

[andersontrooper]

Yeah, that seems to point at airflow issues at idle. I would check the fan shroud too if it's properly in place. The next thing to look into is if the heater core is partially blocked. Beyond those, have you considered the possibility of a restriction somewhere else in the cooling system? It's less common since you flushed the radiator, but a hose could be collapsing internally, or there might be some debris lodged in a coolant passage in the engine block itself. That would be harder to diagnose without a more thorough inspection, so you would need a mechanic. They can do pressure testing and check coolant flow rates at different points in the system.