Date registered: Dec 2006
Vehicle: 2013 VW Golf Sportwagen TDI, 2011 Mazda 2, 2000 E320 4Matic Wagon (retired),1994 C280 (retired)
Location: Toronto, Canada
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I'm just down the road from you in Mississauga, and have basically the same car. I can tell you from experience that the M112 V6 is a cooler running engine than other MB engines, such as the M104 inline 6 I have in my C280. Having said that, it sounds like yours isn't getting hot at all. It should find its way to about 87 degrees, the temperature where the thermostat begins to open. Your climate control should be giving you heat in the interior within 5 to 7 minutes of a cold start - you'll normally start to get warm air when your temp gauge shows ~60 degrees. You should be above 80 a few minutes after that. My guess is that your thermostat is stuck in a partially open state, allowing the coolant to circulate freely through your system, albeit somewhat restricted by the partial closure. A thermostat is a cheap and easy DIY. That's where I'd start.