90 degrees is not normal temperature, 80 is.

I would look into this.

I also don't think an oversized radiator woudl make a difference since it's the thermostat that controls how much collant goes where, but it might be a radiator that is from a totally different model and was forced in as opposed to installed.

Definately look into this.

xp

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1985 190E 2.3L - a constant project.