Hi guys, new here, looks like good site. Just bought 06 CRD and as you all know, cold up here in Canada, anyways love that little Jeep but blowing barely warm air, did some investigating but always rely on experience with this kinda thing. Should I replace thermostat assembly or could it be something else I'm unaware of.? Gauge fluctuates during normal operations more as it works harder, to be expected, out side temp. is 34 F + - average right now.