Your heater is getting warmer when you decelerate and colder when you accelerate?

Start out by checking for a vacuum leak both inside and outside for the a/c and heater.........

Your serpentine belt is loose or worn.

Low coolant and air in the heater core.

A block heater is something that you need to have installed yourself, sometimes in areas of colder climate the dealer will offer it but generally its your responsibility.

Yes, and it has a heater inside which increases temperature inside the dryer to accelerate drying.

Maybe low coolant level

I have a 2006 Altima and it is doing the same thing.

your heater core is going out, you need to replace it before it ruptures.

A room doesnt get colder before putting on a heater or something. This may feel like it because your body will feel the warm of the heat, also it will feel the cold air. This will make you feel more colder.

You'll probably be colder than normal.

The auxiliary heater in a?æVolkswagen Sharon tdi 1.9 is located under the LHS floor plan of the vehicle. Most Sharon's tend to have a problem with the auxiliary heater during the colder months.

You may have a slipping fan belt or, more likely, an oil leak into the heater core.

no as you use your hydraulics the fluid will warm up

heater is not getting hot

Heat naturally moves to colder air. Place the heater on the floor and it will rise to the ceiling, as it is lighter than the cold air.