Rocky_LC

At 450 degrees your coolant WILL be boiling out the overflow and you WILL have a cracked head and you’d probably already have burst the rubber coolant lines. Whatever you are using to check that temp is wrong. I would bet you aren’t overheating...

I didn’t think so either, I’ll try and get a pic next time. Fan is spinning the right way, and yes when it’s topped off it will dump out fluid for a while. Doesn’t sound like it’s boiling though.

It can’t be 450*. All good suggestions (above). The dollar bill trick (put a dollar bill on the front of the radiator to prove the fan is sucking) is a good test. Does it puke out fluid when you stop with a full radiator? Does it make boiling...

Oops sorry, must of made a typo and found myself in the wrong forum. Nice truck btw.