There are many reasons that the cars heating system may alternate between blowing hot and cold air. Some common causes of this include the heater core and air pockets in the coolant.
A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.
Because it's warmer in the afternoon...
well it could be because of the heat. if its cold out and you have the heat on in the car, then you will get hot and that will cause the window to fog.
it maybe your heater core is going out recommend replacing it and go from there
Yes, and it can also make your car to over heat
You either just need to wait for it to heat up when the car turns on, or it's broken.
You can not get heat from cold water, The engine has to run long enough to get the water in the engine HOT. That is were you get heat from HOT WATER-- Coolent
because the seats and carpet and such store and release heat.
Everyone says it does but I was A sales rep at a new car dealership for A couple years and I could never tell that the black one was hotter that the white, In the summer they were all hot as fire,, In winter they were cold, cold, cold.