My 1991 190E 2.3 aux fan has recently started cycling on and off pretty frequently, like every couple of seconds. It doesn't always do it, but will once the temperature has gotten to aobut 80C. It was operating fine, coming on at 100 C like it should, but then started operating erratically. It does it without the A/C operating, so I don't think it's the high pressure switch. I measured the resistance of the coolant temp sensor, and it was about correct. Any suggestions as to the cuplprit? It seems as though it should be the coolant temp sensor, but it seems to check out. Thanks for your suggestions!

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Ted Beer
'91 190E 2.3