Before you start tearing the car apart again, get a voltmeter and check the output voltage of your alternator. Some of the later model fan regulators have a thermal cutout if the control voltage gets too high and the regulator has to dissipate too much heat. I just went thru this with my 300E (BTW, thanks, Steve B.). My voltage regulator was acting up and finally failed. Check it first. Good Luck..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.