I echo Joey's comments ..... If you have not replaced your engine harness, you need to do it now. Look at the wire insulation around the thermostat housing beyond the fabric wrap. If you see cracks or can chip off the insulation with your fingernail, the harness needs replacing before it shorts and causes more damage.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"