Re: heater gone cold
Have you had a coolant flush and fill performed? If not, it'd be a wise choice as it will remove any contaminants. Heater cores will rust out over time, blocking the coolant from flowing properly. This would explain why you get heat when traveling on the highway. There are also kits one can purchase where you can backflush the heater core with a standard garden hose - it's just not the right weather outside to do that.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!