CRL in a radiator

[mopar346]

Different question for ya:

I am on the road with my Comet about 1000 miles from home. The temp gauge runs higher than I like at 70 mph for a while in the heat of the day. The radiator isn't but about 10 years old, looks good internally and seems to flow well. The t-stat is a 180* and new as are the hoses and coolant. The coolant I drained out before I left looked very fresh but I changed it for GP. I want to do something just to see if it helps. I think I am gonna pull the radiator and back flush it with a garden hose with a pressure nozzle. I am considering pour CLR in it and letting it sit for a while and then flushing it out. My thoughts are since CLR clears calcuim and that is some of what builds up in a radiator then the CLR will help or at least ensure that there is no calcuim. The question is has any one done it? Do you know a reason I should? Any general thoughts on my thinking.

For the record, I have shot it with 2 heat guns and have a radiator cap with a temp gauge in it. The car/engine is not running hot, it is just reading higher on the gauge than I am comfortable with at extended highway speeds in the heat of the day. It does seem to run about 20* warmer than at 60 mph, which I guess is expected. Cap reads 210ish when my gauge is high, reasonable considering it is the top/return of the radiator. So why am I doing anything? Peace of mind and just to be certain the radiator is as clear as possible.

63.5 Comet S-22 260 V8/2 speed Fordamatic/3.25 8 inch/factory sweep gauge no numbers (always read 2/3 scale, reads 3/4-7/8 when I'm concerned).

I know it is a Chevy truck forum but there is a lot of knowledge on here.

Thank in advance, Kevin