Washed the truck yesterday, and while washing off the radiator, I noticed that the upper hose had "collapsed".

Opened the resevoir and it appeared to allow the hose to expand.

Do I have a bad "radiator cap"?????

I noticed last week that my rad hose was collapsed as well. I never opened the reservoir cap.

This happens to me. Every once in a while take your overflow cap off and check the check valve under it. You will find it is stuck. wiggle it and you're good for another 10K.

Thanks,

Went out and checked it, and it was stuck.