Thanks DRTDEVL-- I was re-reading a lot of your posts on your recent rebuild. I ran the truck for a long time, several times on Saturday, with the cap off, and the front of the truck uphill. Bubbles kept coming out of the radiator no matter how long I ran it...

The cap is about a year old. I did buy another one the other day because it doesn't seem to be venting. I'll throw that on tomorrow. But it still doesn't seem to explain the constant bubbling coming up through the radiator. I let it sit there and run for a good half hour and it kept doing the same thing.

I would hate to get this apart and realize there is nothing wrong. <img src="/forums/images/graemlins/ignore.gif" alt="" /> Thanks for the advice. <img src="/forums/images/graemlins/cheers.gif" alt="" />