Now, I have a heat gun, and could check the temperature at the clutch and see if it should be engaging or not. Is there a good place to aim the heat gun at??

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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