helllp with cooling issue

BillG - the IR I have is a cheapo from Harbor Freight. I was surprised that it was fairly accurate also. I was aiming at the thermostat itself, and also the bottom of the can I was heating it in (top of water).
green1 - the radiator was a stock replacement 22" wide x 19" tall.
Joe - I looked at these radiators on ebay. I just sold a few parts and have a few bucks at paypal now so I may very well bite the bullet and buy a new one. I do want to try a new thermostat first though - and check with a local radiator shop for a three row as green1 suggested.
Thanks everyone:cheers:
I will post results as changes are made.
C