koorenhof

hey guys my truck is running super hot and just recently i had a new radiator put in, i noticed that it run hot in like drive threws and in traffic but now its getting worse, if i go fast on the open highway the meter goes down but goes back up after slowing down?

TNRabbit

Check the fan clutch; sounds like it's going out. That may have been your problem all along.

Also, did you "burp" & get all air out of the system?

peow130

When you replaced the radiator, you probably didn't burp the coolant system. What this means is that you have a massive air bubble in your coolant system, where coolant isn't cooling. Probably near the back of your engine in the head.
What you need to do is park the truck, let it cool, start it with the radiator cap off, and slowly fill until it no longer takes any coolant. The coolant level should rise, and might even overflow a few times throughout, but if it lowers back down then you successfully burped your system.

TNRabbit

This works best if you park it with the nose uphill~

mt_goat

x2...

3-BALL

I would say fan clutch. Spin it by hand even warm it should only turn about half a turn.

peow130

I've done it both uphill and level ground, and found that either way it did the same thing. Granted uphill took about a minute less time lol