Last week I pulled into work to pick up my paycheck, and when I came outside there was a small puddle of coolant under the truck. I popped the hood, and it was around the top of the radiator right where the upper hose attaches, so I figured I had a cracked hose. I pulled that off, and found that it was getting old, but didn't seem to be cracked. I replaced it anyway. While I had it off, I noticed that the thermostat housing was corroded pretty badly, so I pulled it off in lieu of a new one for 8 bucks. The new one, by the way, looked to me like it wouldn't flow as well, but I figured it wasn't exactly a necessity for it to flow extremely fast. While I had that off, it just made sense to replace the thermostat, so I replaced it with a... uh... 195 I think it was, the original one and the same as what I removed. Let it cure, started it, and no leaks for about a week.
Then, today, it leaked the same. Right onto the top ridge of the radiator around the upper pipe, but here's the strange thing:
I went to add a quart of oil the other day, after stopping for not fifteen minutes, and the upper radiator hose was completely collapsed on itself. I popped the cap off, and it sucked right in. I figured it was low, and topped it off. Next stop I got out and looked, and it looked fine. When I came out, it was collapsed again. I drove it again and when I stopped it was fine, and two hours later when I came back out it was collapsed, so I popped the cap again and topped it off again, and all it took was half a gatorade bottle of water. After that I went to a friends place and when I came out it was collapsed again. WTF?
I don't know what's causing this, I'm pretty dang sure it's filled to capacity with no air bubbles. Tomorrow I'm going to get a new cap for the radiator, but I don't see what that could have to do with it. Do you guys run 16 or 13 pound caps?
Anyway, any advice is welcome...