Like I did with now, the first thing you need to do is get the cooling system straight, There are plenty of us who have dealt with fans, and relays, etc. Many times it is something simple that someone with the right knowledge can diagnose in 5 minutes.

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000