Hi all I have a problem on my new 1985 300D when I let the car run for 2-3 min yesterday temp was around 35ish (outside or ambient temp) so kinda cold, the temp gauge inside the car started to "pulse up" it was sort of like a clock work movement just "ticked" its way up to the red line and then beyond but thats impossible its that warm, So any ideas as to whats causing it? I am thinking a short or maybe the temperature sending unit. I kept on feeling the radiator and the hoses coolant is flowing and the heat is the perfect temperature. Any help would be great thanks.