Quote:
Originally Posted by winmutt
You should not be hitting 100C. I rarely get over 80, in 100F I will hit 86 which is where the tstat opens both ways IIRC.
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That is exactly what my OM603 87 300TD and my OM606 98 E300DT do.
Gauge hovers around 80C in both cars but will peak at around 85-90C in severe circumstances - like a hard highway run then pull off and sit in traffic on a 90+F day. As soon as I get some motion the temp drops right back to 80C. Obviously this is with the AC on.
I second the notion of stuck t-stat based on OPs latest description.
Electrical - try the OVP, a junkyard OE OVP is better than new aftermarket, just make sure it's from a Diesel.
Out there question - you do have the belt threaded on the pulleys correctly, right? If you have the pulley turning the WP threaded backwards your cooling will be for naught.