My 86 603 really needs a good fan clutch to stay cool when summer comes. No problem below 90*F. But above that the 603 realy needs that fan yanking lots of air through the radiator or it will get in the +100C zone. By the way....needs it a highway speeds too cause there is too much front end (body & mechanical) deflection to pass the required air flow at high ambient temps.

They (fan clutch) seem to loose thier "grip" after a while and not rotate the fan as fast as needed, even after 5-10k post installation for aftermarket jobs.

Fooled before so now when summer comes I replace it, or as last week added silicone. Also wash the AC condensor & radiator fins.

Today (post fan clutch service & "fin" cleaning) I'm in the Phoenix area with ambient temps up in the 111 to 115 range. Had the AC cranked to max all day, temp guage never made it up over 95*C. Mixed driving with stop & go to 75mph.

Like others say your temps may be due to other componets / head condition but I for one don't trust those fan clutchs farther than I can throw them. Very sneaky b*stards

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1986 300SDL 440,xxx