For those people who whack the heaters on and then go back inside the house, you do know your car is taking an absolute age to warm up.
Instead, flick the heaters to cold (don't even turn the blower on) start the car and come out in 5 minutes, switch to hot and set to a low speed.
The coolant will be much warmer (and thus work miles better) than if you'd just left the car cooling the freezing cold engine coolant, which you were doing by having the heating and blower on max on a cold engine.
Afterall, it's the engine coolant that runs through the heater matrix inside the car.
Instead, flick the heaters to cold (don't even turn the blower on) start the car and come out in 5 minutes, switch to hot and set to a low speed.
The coolant will be much warmer (and thus work miles better) than if you'd just left the car cooling the freezing cold engine coolant, which you were doing by having the heating and blower on max on a cold engine.
Afterall, it's the engine coolant that runs through the heater matrix inside the car.