Thanks for all the replys, after much thought I went and bought a new tstat again and found out from "napa" that the old one was the cheapo version of their line. I got a different one this time that looks better made and he says is better. Whatever, I drilled a small hole in it after seeing alot of posts on here about it and asking a few chevy friends. The old one was installed correctly by the way, spring and pellet down needle part up. I also bought a new rad cap as well. It is a 7lb. Also the new tstat is a 160f this time. The sender I bought at napa as well a year ago. It seemed to work ok until now. What is the temp. these 235's overheat? I also know it's not a blown head gasket, it runs fine and has no signs of coolant loss. I'm not going touch the rad. yet, I might try to back flush it later if this doesn't work.
I kinda am leaning towards an air pocket or the cap isn't putting any pressure on the system and it's boiling over to easy. I dunno but I'm tired of this thing getting the best of me I will be testing the old tstat.
I hope it's not a rad. The last rad. shop told me 80 dollars to rod out my old rad. on my 61 chevy and the guy said it leaked after and then wanted 280 to replace the cores and rebuild it. I said ok cause I had no options at the time but I think he took me. It never was the same when it came back, The tanks started to rust in about two weeks cause he crudely sparyed on cheapo black paint. I'll never go back to that place. O yeah it took three weeks too.
