Footwell vent temp sender -G192
A - Bolt
B - Footwell
C - Footwell vent temperature
The climate control is fully
automatic. The air flowing out of the
heater/air conditioner unit into the passenger compartment is recorded with a
temperature-dependent resistance and so is available as an influencing variable
in the temperature monitoring and control function of the Climatronic control
unit -J255. The footwell vent temperature sender
-G192 is located in the air duct to the left side footwell and is designed as
an NTC sensor. As the temperature falls the electrical resistance increases.
The resistance is evaluated as a signal by the Climatronic control unit -J255,
and is used to regulate the air distribution and the
blower flow rate.
shows that temperature senders are the most frequent cause of temperature
control faults. They do not usually fail immediately, but deliver false values
to the control unit based on an additional wire resistance as a result of
damage or corrosion in the connector contacts. Thus a comparison of the values
of other senders (-G191, -G263) in the relevant display zones is recommended
for optimum diagnosis.
J The measured values in
display group "034" zone "1" (centre vent temperature
sender -G191) and display group "034" zone "3" (footwell
vent temperature sender -G192) during operation of the air conditioner
(temperature preselection for dash panel vents and footwell vents, cold
setting) may after 5 minutes be a maximum of 5 °C higher than the value in
display group "035" zone "1" (evaporator out-flow
temperature sender -G263 ).
Measured value block 034
Display zone 1
Readout of centre vent temperature
sender -G191 in °C.
Display zone 3
Measured value of footwell vent
temperature sender -G192 in °C.
Measured value block 035
Display zone 1
Measured value of evaporator
out-flow temperature sender -G263 in °C
conditioner; Rep.Gr. 87; Removing and installing footwell vent temperature
conditioner; Rep.Gr. 87; Checking air conditioner cold output
A Current flow diagram