The heater core valve is probably sticking or adjusted wrong.
Whatever it is set to on your heater's control keypad.
Cars with an Automatic Temperature Control system have a thermometer in the dash console with little vents to allow air to come in. The thermometer temperature reading is then used to control the fan speed and also the air mix (temperature) to match the temperature selected....
I think your refering to the door in the heater housing that directs air to vents, floor or defroster vents, there is also a blend actuator that mixes heated or cooled air to give the correct temperature from the selector.
Check temperature control cable for binding.
It is Iceland that has geothermal vents. Iceland's population use it to heat their houses and to make electricity.B.C. The Hairless Guy
hot rocks deep in the crust.
The organisms living near hydro thermal vents are cold blooded animals whose body temperature does fluctuate as per the environment. There thermo regulatory receptors are missing and they do not posses any control over their body temperatures.
why dont bottom vent doors not open on 2001 gmcsonoma
This is a common question for new owners of Mercedes 190e. The center vents only blow outside air and conditioned air from your a/c. This is the design of the system. The reason Mercedes made it this way is to keep the driver alert and awake. You can adjust the flow of air from the center vents by moving the slider up or down, but the air will always be the ambient temperature from the outside or from your a/c when it is engaged.
Depending on the year, make, model along with if it has single or dual a/c systems and what the outside temperature is, it can be between 36 to 48 degrees...... Simply, the A/C vents temperature should be whatever you set the thermostat as.
Hydrothermal vents.
If the climate control on a 2003 Trailblazer will not switch from feet to head vents, try changing it to defroster then back to head. The mode button on the dual climate control model can only be switched from face/feet to feet and then to defrost. The feet and head vents worked at the same time.