engine AUDI A4 1997 B5 / 1.G Heating And Ventilation System Servicing Workshop Manual
Page 10 of 24
87-160
- Release pressure in coolant system by opening
cap at coolant expansion tank.
WARNING!
With hot engine, cooling system is under
pressure.
Coolant expansion tank cap must be
removed slowly.
CAUTION! - Clamp coolant hoses -A- and -B- with VAG3094 (or equivalent) and
remove from heater core inlet/outlet.
- Place catch basin below heater core connection -A- and carefully blow
coolant out of heater core with compressed air through connection -B-.
- Remove A/C system vacuum supply hose from engine and attach at
heater core inlet/outlet.
- Remove boot -C-.
Dispose of used coolant properly. Check local regulations.Do not re-use used coolant.
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Page 11 of 24
87-161
CAUTION!
Immediately plug open connections on A/C components and lines to
prevent dirt and moisture contamination. - Remove bolt -A-: tightening torque 15 Nm (11 ft lb).
- Loosen refrigerant line clamp and remove lines from evaporator.
- Secure refrigerant lines in engine compartment to allow unobstructed
evaporator re-installation.
- Use blank plug from a replacement evaporator -C- to seal the
connections at the evaporator; this also aids with evaporator re-
installation.
- Remove boot -D-.
- Disconnect low pressure switch -F73- electrical connection and secure
connector end to evaporator fixture.
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11/21/2002 htt
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Page 16 of 24
Install refrigerant lines free of stress.Evacuate refrigerant circuit and charge system with refrigerant R134a
page 87
-204
.
Fill with fresh coolant/anti-freeze and bleed cooling system Repair
Manual, "General, Engine," Repair Group 19.
Pa
ge 16 of 24 Heatin
g and ventilation s
ystem, servicin
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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Page 17 of 24
87-165
Heater/air conditioner assembly,
removing and installing (1997 )
CAUTION!
Obtain security code for anti-theft radio.
Note customer's pre-set radio stations.
Move power seats to most rearward
position.
Switch off ignition and disconnect battery
ground (GND) strap.
- Release pressure in coolant system by opening
cap at coolant expansion tank.
WARNING!
With hot engine, cooling system is under
pressure.
Coolant expansion tank cap must be
removed slowly.
Dispose of used coolant properly. Check
local regulations.
Pa
ge 17 of 24 Heatin
g and ventilation s
ystem, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.87.22