Originally Posted by paintballdude05

The upper rad hose is most likely leaking at the o-ring connection. That o-ring is a sub $10 part vs. the cost of the whole hose.

Originally Posted by EX1

Ya I saw the four fixes after reading the whole thread. My service woman can't tell me if it is leaking at the reservoir or not. I was just going to head to the dealer today after work and see what exactly is going on. Replacing this o-ring on the upper hose has been working for people though?

Originally Posted by paintballdude05

You got to love those types of warranties. The o-ring in the upper rad hose is an easy one to do. The one on the t-stat housing isn't hard either but you have to buy a complete hose assembly, the o-ring isn't available from Ford by itself. Also, make sure you use the Ford Specialty Orange coolant when you top back up.

Originally Posted by EX1

I picked up the o-ring listed earlier in this thread but the Ford diagram shows it for the lower radiator hose. Does the upper and lower radiator really ue the same o-ring? The one that came with my truck's upper radiator hose is clear colored and this one is black.

Thanks for the advice by the way.

Originally Posted by paintballdude05

You got to love those types of warranties. The o-ring in the upper rad hose is an easy one to do. The one on the t-stat housing isn't hard either but you have to buy a complete hose assembly, the o-ring isn't available from Ford by itself. Also, make sure you use the Ford Specialty Orange coolant when you top back up.

Originally Posted by benchwarmer4203

I did a fair amount of searching prior to creating this thread; but if I missed another one somewhere that addresses my issue please post the link.

The other day I noticed that my engine fans were running more than they should be, popped the hood, and wouldn't you know it...I was low on coolant. I had just changed the oil and checked all fluid levels a few days ago and they were all fine. The leak wasn't hard to find, though. It's the connection for the main coolant hose at the bottom of the coolant reservoir. This hose is just held on with a snap ring. After looking up the parts list it doesn't look like there is an O-ring or flat gasket at this connection, and I didn't see any signs of the hose or the tube connection on the reservoir being cracked. Why is this connection leaking all of a sudden? I tried to tighten down a hose clamp on this connection ahead of the snap ring, which helped some; but didn't completely stop the leak. Any suggestions?

On to the second part of my post, to repair/further troubleshoot this issue I know I'm going to have to drain coolant. I have 70,000 miles on the truck now, so I figure in the process of troubleshooting I might as well drain all of the coolant, flush the system, and fill everything back up with new. I haven't really looked yet; but are there coolant drain plugs on the radiator? Would someone be able to give me a quick how to on draining, flushing, and refilling the coolant system?

Thanks in advance for any help, guys.