Heating and A/C unit, removing and installing: Installing
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order, paying attention to the following:
- Check all seals at air conditioner for damage prior to installation and replace damaged seals.
- Check attachment of coolant lines to heater core.
- Make sure coolant hoses are properly connected to heater core. observe markings:
A - Supply from cylinder head
B - Return to water pump
- Reinstall components removed (with the exception of drivers storage compartment) in reverse order.
- Bleed coolant circuit →
- 19 - ENGINE - COOLING SYSTEM for 1.8 LITER 4-CYL. 5V TURBO ENGINE MECHANICAL, ENGINE CODE(S): AMB
- 19 - ENGINE - COOLING SYSTEM for 2.0 LITER 4-CYL. 4V TURBO ENGINE MECHANICAL, ENGINE CODE(S): BPG, BWT
- 19 ENGINE - COOLING SYSTEM for 3.0 LITER 6-CYL. 5V ENGINE MECHANICAL, ENGINE CODE(S): AVK, BGN
- 19 - ENGINE - COOLING SYSTEM for 3.2 V6 4V ENGINE MECHANICAL, ENGINE CODE(S): BKH
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 4V ENGINE MECHANICAL, ENGINE CODE(S): BNS
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 5V ENGINE MECHANICAL, ENGINE CODE(S): BHF
NOTE:
- The arrangement of the coolant lines to the heater core of the air conditioner is such that the heater core must also be bled. Proceed as follows:
- - Bleed coolant circuit.
- - Switch off ignition.
- - Carefully open cap at coolant reservoir (observe safety precautions for opening cap) →
- 19 - ENGINE - COOLING SYSTEM for 1.8 LITER 4-CYL. 5V TURBO ENGINE MECHANICAL, ENGINE CODE(S): AMB
- 19 - ENGINE - COOLING SYSTEM for 2.0 LITER 4-CYL. 4V TURBO ENGINE MECHANICAL, ENGINE CODE(S): BPG, BWT
- 19 ENGINE - COOLING SYSTEM for 3.0 LITER 6-CYL. 5V ENGINE MECHANICAL, ENGINE CODE(S): AVK, BGN
- 19 - ENGINE - COOLING SYSTEM for 3.2 V6 4V ENGINE MECHANICAL, ENGINE CODE(S): BKH
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 4V ENGINE MECHANICAL, ENGINE CODE(S): BNS
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 5V ENGINE MECHANICAL, ENGINE CODE(S): BHF
- Loosen clamp at coolant hose - B -.
- Slide back hose - B - until hole in hose is no longer sealed off by line.
- Use cooling system tester V.A.G 1274/hand pump for example to increase pressure in coolant circuit.
- Bleed heater core by way of hose - B - until there are no bubbles in coolant emerging.
- Install coolant hose - B - and secure with clip.
- Replenish coolant if necessary.
- Check coolant circuit for leaks, paying particular attention to connection between coolant lines and heater core. →
- 19 - ENGINE - COOLING SYSTEM for 1.8 LITER 4-CYL. 5V TURBO ENGINE MECHANICAL, ENGINE CODE(S): AMB
- 19 - ENGINE - COOLING SYSTEM for 2.0 LITER 4-CYL. 4V TURBO ENGINE MECHANICAL, ENGINE CODE(S): BPG, BWT
- 19 ENGINE - COOLING SYSTEM for 3.0 LITER 6-CYL. 5V ENGINE MECHANICAL, ENGINE CODE(S): AVK, BGN
- 19 - ENGINE - COOLING SYSTEM for 3.2 V6 4V ENGINE MECHANICAL, ENGINE CODE(S): BKH
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 4V ENGINE MECHANICAL, ENGINE CODE(S): BNS
- 19 - ENGINE - COOLING SYSTEM for 4.2 LITER V8 5V ENGINE MECHANICAL, ENGINE CODE(S): BHF
- Reinstall drivers storage compartment and remaining components removed.
- Attach refrigerant lines to evaporator → Refrigerant lines on evaporator flange, removing and installing .
- Check correct positioning of evaporator hose → Evaporator housing drain, checking .
- Evacuate and recharge refrigerant circuit. → 87 - AIR CONDITIONING
NOTE:
- When installing instrument panel, make sure intermediate defrost piece is properly positioned on air conditioner on insertion and that defroster vent does not squash intermediate piece on installing.
- After installing instrument panel, check exit direction and distribution of air flow from defroster vent to windshield.