Audi Q7 2007 Repair Manual page 79

Note
The Coolant Recirculation Pump - V50- is currently not instal‐
♦
led on all vehicles. On vehicles with a 6-cylinder gasoline
engine, the Coolant Recirculation Pump - V50- is installed only
on vehicles with the "parking heater" optional equipment.
Depending on vehicle equipment, the Coolant Recirculation
♦
Pump - V50- is actuated by the respective engine control mod‐
ule and by the Climatronic Control Module - J255- front A/C
control head (for example, via the Coolant Circulation Pump
Relay - J151- ). Refer to Wiring diagrams, Troubleshooting
and Component locations. Use the Vehicle Diagnostic Tester
via the "Guided Fault Finding" function.
On vehicles with 6-cylinder gasoline engine without the "park‐
♦
ing heater" optional equipment, the Water Pump - V36- is
installed instead of the Coolant Recirculation Pump - V50- . It
is actuated, for example, via the Recirculation Pump Relay -
J160- . Refer to Wiring diagrams, Troubleshooting and Com‐
ponent locations. Use the Vehicle Diagnostic Tester via the
"Guided Fault Finding" function.
On vehicles with a parking/auxiliary heater, the Coolant Re‐
♦
circulation Pump - V50- is incorporated into the parking/auxil‐
iary heater hosing.
On vehicles with a Start/Stop system, the Coolant Recircula‐
♦
tion Pump - V50- is turned on by the climatronic control module
-J255- during the stop function when it is necessary to heat
the passenger compartment. Pay attention to the correct mod‐
el, coding and adaptation for the Climatronic Control Module
- J255- front A/C control head for these vehicles. Use the Ve‐
hicle Diagnostic Tester via the "Guided Fault Finding" function.
On vehicles from MY 2011 with a diesel engine and with the
♦
start/stop system without the optional "auxiliary heater" (with
a fuel-driven auxiliary heater or an Auxiliary Heater Heating
Element - Z35- ), a Heater Coolant Shut-Off Valve - N279- may
be installed in addition. In the case that the heating output on
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
these vehicles is lacking, additionally check the actuation and
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
functionality of the heater coolant shut-off valve -N279- . (For
with respect to the correctness of information in this document. Copyright by AUDI AG.
the installed locationIncorporation into the Vehicle Electronics
and Activation of the Heater Coolant Shut-Off Valve -N279- .
Refer to Wiring diagrams, Troubleshooting and Component
locations). For vehicles with an auxiliary heater heating ele‐
ment -Z35- , the heater coolant shut-off valve -N279- is acti‐
vated via a relay (for example, via the Engine Coolant Shut-
Off Valve Relay - J541- ) from the Climatronic Control Module
- J255- front A/C control head. Refer to Wiring diagrams, Trou‐
bleshooting and Component locations. Use the Vehicle Diag‐
nostic Tester via the "Guided Fault Finding" function.
For a complaint of "poor heating performance", check before re‐
moving the Coolant Recirculation Pump - V50- (the Water Pump
- V36- ).
– The incorporation into coolant circuit (correct connection of
coolant hoses at supply and return to engine). Refer to
⇒ "6 Incorporation of the A/C System in Vehicle Coolant Cir‐
cuit", page 66 .
– Wiring to Coolant Pump - V50- (of Coolant Pump - V36- ) for
interchange ("+" and "-"). Refer to Wiring diagrams, Trouble‐
shooting and Component locations.
– The actuation of the Coolant Recirculation Pump - V50- (of the
Water Pump - V36- ) by the Climatronic Control Module - J255-
front A/C control head via the respective relay. Refer to Wiring
diagrams, Troubleshooting and Component locations. Use the
Heating, Ventilation and Air Conditioning - Edition 04.2013
6. Incorporation of the A/C System in Vehicle Coolant Circuit
Audi Q7 2007 ➤
73