107 radiator

Well, recently my 1988 560SL suffered from the typical "broken waterneck" so often discussed in forums in the past. Enough of the neck was still
attached to the tank to allow the hose to stay on, so I bided my time in replacement,ordering an all-metal zeigler radiator in Jan. My goal was to replace the unit in March or so, and the hoses (relatively new already), thermostat (age and temp unknown), and maybe the water pump.
Well, weather turned warm early here in the south, and I got anxious. I did not have the other parts in hand, and could not get them locally, so I decided to change the radiator out NOW and the rest at a later date.
Here is the rub... (The radiator fit OK, and looks great. All fittings, etc were where they were supposed to be, and the whole job was relatively painless, in spite of the unit not fitting the mounting without a little persuasion, and the rubber bushings for the bottom mounts had to be trimmed a bit to fit in the mounting rings on the bottom of the radiator). Today, ambient temp was 65F. My car, on a road trip of 75 miles at 70mph, ran a water temp of 85-90C, and climbed to almost 100C upon climbing a 3% or so grade for several miles. I had the AC on to cool the interior as the sun coming in was heating up my better half above her comfort level. I guess I expected the water temp to be closer to 80C since the ambient temp was cool. Last summer, even on the hottest day, I never saw the water temp at or above 100C, usually staying in the 80-90C range (which I always marvelled at). Oil pressure is 2.2 or so at idle when warm, 3 pegged at cruising rpm.
I am intrested in this groups opinion... Should I have replaced the radiator with a BEHR (with plastic tanks)?
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"Where is it again that we are going, and why are we in this handbasket?"
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"So I decided to change the radiator out NOW and the rest at a later date." Is that to mean no new thermostat?? That would have been a must change for me when I change water pumps and radiators. As long you were there the "thermostat" is often very cheap and simple to do. Me I would've replaced it. Cheap insurance.

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<snip?
I am intrested in this groups opinion... Should I have replaced the

I have to agree with the other gentlemen who suggested you install a new thermostat.
Also, make sure the coolant is properly "full"
Also make sure the aux fan is still connected properly...
Random thoughts, Marty
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Does the temp fluctuate a lot? Could you perhaps have air in the sytem? The thermostat may be suspect, but I don't like how the temps went up to 100. Why not just buy a thermostat (like $35) from the local dealer and pop it in (like 15 minute job..though you'll have to drain a lot of coolant and put it back in). Richard

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I agree but to make sure it's not the radiator why not remove the thermostat completely for a couple of day's driving and see what the temp does. If it still goes into the 100c range then you might have a problem with the new radiator. Believe it or not a lot of these after-market, all-metal radiators are made in Turkey! I replaced mine in our 300D, replaced the thermostat and it definitely ran a little warmer but not enough to cause concern. It has worked fine for nearly a year but did cause me to scratch my head a little at the water temp rise. Good luck!
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Not at all. I just found it unusual, sort of like trying to find a decent bottle of wine in Morocco.
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