From a preventive maintenance point of view, how many miles are usually on a 85 300zx when they (radiators) fail, in general? ...150K, 200K, 250 (maybe), or do they rarely fail? I would rather replace if it is somewhat certain it will eventually fail (before the engine does), rather than get stuck on the highway with an overheated engine. I have about 150K as does johndrew24.
I'm sorry to say, the antifreeze/water doesn't get changed every year--not even close. But it will from now on, after I replace the radiator to give the engine a little overheating insurance. I will flush it with the old radiator still attached before installing a new radiator.
I just didn't know how long radiators were supposed last. I figured deposits, rust, or something would eventually ruin them over time. I guess that 'something' could be called 'lack of preventative maintenance.'
Thanks AZ_ZBum, 1sikZ, johnndrew24, phxZ31, and domdogg123.