Plugged radiator

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Can you put something like CLR into a radiator to help unclog the buildup? Reason for asking is in have a friend that is in a bind and experiencing overheating problems when sitting still. First reaction was to change the thermostat (and we did) but we noticed the coolant level fluctuating like 3 inches when the thermostat starts opening. This makes us think its having a hard time getting through from one side to another and must be plugged. Well for the single parent this isn’t the preferred time of year to have to deal with large repairs so understandably some band aid thoughts surfaced. First one that seams worthy of pursuing advice on was maybe adding some CLR it in and run it throughout the day, then flush, and then refilling with coolant and adding conditioner. Now I know this isn’t exactly relative to this site but thought surely someone has some input on this..

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Ive found some radiator flush that is supposed to do the trick.. ever try it before, worth the trouble??

[pooks350shubby]

I don't profess to a great deal of knowledge, but I really would be leery of coolant flush chemicals as 6.0's are AFAIK very touchy in re. to their cooling systems and what goes in them. Also, please read all the info. that's on here in regards to EGR / Head Gasket issues it can and will save your life. If you smell coolant AT ALL or it's puking in the degas bottle you would be well advised to check into the system in greater detail. Hopefully it is just "plugged" and someone can chime in here w/ a fix but again 10,000 and up for a motor just screams "caution".