Temperature control, function - GF83.57-P-2000B

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

MODEL 140 as of 1.9.95

Function

The temperature set on the temperature setting pushbuttons on the pushbutton control module is achieved or held constant by:

cooling by means of the evaporator
heating by means of the heater core

cooling and reheating (reheat mode)

Heating

The heater core heats up the air flowing through on the way through the air ducts into the vehicle passenger compartment. The heat given up by the heater core is regulated by the duovalve controlling the quantity of heated coolant flowing through. The duovalve is controlled by the pushbutton control module.

Cooling

The expansion valve on the evaporator causes the liquid refrigerant under high pressure to expand reducing the pressure. The refrigerant then evaporates. The heat required for evaporation is taken from the air flowing through the evaporator. After cooling in this manner, the air flows through the air ducts into the vehicle passenger compartment.

Reheat mode

The air cooled and dried by the evaporator is reheated in the heater core. This prevents the windows from fogging up on the inside.

Warm temperature pushbutton, location/purpose/design/function		GF83.40-P-2160A
Cold temperature pushbutton, location/purpose/function		GF83.40-P-2161A
Rear air conditioning temperature selector, location/purpose/function	with code 582 (rear air conditioning)	GF83.50-P-2114S
Duovalve, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2107A
Duovalve, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2107S
Heater core, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2108A
Heater core, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2108S
Coolant circulation pump, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2109A
Coolant circulation pump, location/purpose/function	with code 582 (rear air conditioning)	GF83.20-P-2109S
Evaporator, location/purpose/function		GF83.40-P-2164A
Rear air conditioning evaporator, location/purpose/function	with code 582 (rear air conditioning)	GF83.50-P-2111S
Expansion valve, location/purpose/design/function		GF83.40-P-2123A
Rear air conditioning refrigerant shutoff valve, location/purpose/function	with code 582 (rear air conditioning)	GF83.50-P-2103S
A/C compressor injection valve, location/purpose	with code 582 (rear air conditioning)	GF83.50-P-2118S
A/C compressor, location/purpose/design/function	Engines 104, 119	GF83.55-P-2100A
A/C compressor, location/purpose/design/function	Engine 120	GF83.55-P-2100B
In-car temperature sensor with fresh air blower, location/purpose/function		GF83.57-P-2107A
Heater core temperature sensor, location/purpose/function	with code 582 (rear air conditioning)	GF83.57-P-2108A
Heater core temperature sensor, location/purpose/function	with code 582 (rear air conditioning)	GF83.57-P-2108S
Evaporator temperature sensor, location/purpose/function	with code 582 (rear air conditioning)	GF83.57-P-2109A
Evaporator temperature sensor, location/purpose/function	with code 582 (rear air conditioning)	GF83.57-P-2109S
Outside air temperature sensor, location/purpose/function		GF83.57-P-2110A
Sun sensor, location/purpose/function		GF83.57-P-2111A