Think I figured it out. Blower motor was sticking. Cleaned the shaft and oiled the bushings on the motor cage. Seems to run fine now...

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic