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On my 126 car, they both come on. I have a low and a high speed. The later engages when temps exceed 102C. If your fans sit side by side, it wouldn't make much sense for just one to run. Both side-by-side fans would cover the spans of the radiator.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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