How about using chemical radiator flush treatments (radiator installed). Are these safe? I just replaced the UIM & LIM (upper & lower intake manifolds) and so I don't want to take a chance of damaging seals or gaskets. I appreciate any advice on this subject.

Also: Due to my above paranoia, I may just get a new radiator. Anyone have good replacement recommendations (i.e. brand and suppliers)? Thx

Did some searching here. I might try Radiator Express as others have.

From the lack of comments, I'm gonna assume that no one wants to go out on a limb and say these chemical radiator cleaners are perfectly safe to use. I guess its a new radiator for me. I'm sure that'* the best route to go anyway.

I'd say it'* safe. I've used Prestone Super Flush without problems.

x2. i use the prestone flush all the time. i haven'e had any problems. old school guys would tell you to use laundry detergeant, but id say just spend the 3 bucks and get whats meant for it.

OK, thanks Ted. Maybe I'll give it a try.

P.*. I went ahead and got a new radiator from RadiatorExpress. For $136 delivered. Why not.