Checking, removing and installing condensation drain (rear) — AUDI

🧭 Before you start

Raise the car and check that the drain valve closes properly and is free of wax or underseal, then clear the drain from the rear unit with a wire. To renew the hose, switch off the ignition, release the drain from the floor panel, move the rear air conditioning unit to its service position and swap the hose, fixing it with a hose clamp. Refit the unit with the drain located in the floor opening, then pull the hose through from underneath and secure it without twisting.

Fits: Audi Q7 (4L, 2005–2015)

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• The valve must close properly and be free of wax or underseal.
• Hose may be fixed by cable tie or clamp depending on production date; refit with a hose clamp.
• Make sure the drain sits in the floor panel opening when the unit goes back.
• Do not twist the drain hose when securing it in the rear floor panel.

Written for this job from the workshop steps below · TorqFix editorial.

📋 Procedure

1. Check the valve (A) from underneath (with the vehicle raised). The valve must not be gummed up with wax or underseal and must close properly.
2. Check for contamination of the condensation drain of the rear air conditioning unit (F) (with a piece of wire, for example) and clean if necessary. [Note: The condensate hose (D) must be firmly attached to the connection of the air conditioning unit (F).The condensate hose (D) to the valve (A) must not be kinked or crushed.Depending on the production period, the condensation hose (D) may be attached to the condensation drain of the air conditioning unit (rear) (F) with a hose clamp (E) or a cable tie.]
3. Switch off ignition.
4. Slide the condensation drain (B) from underneath into the passenger compartment (to do so, unfasten the condensation drain (B) from the rear floor panel (C)).
5. Move air conditioning unit (rear) to service position .

6. Detach the condensation drain hose (A) from the condensation drain of the air conditioning unit (D). [Note: Depending on the production period, the condensation drain hose (A) may be attached with a hose clamp or a cable tie to the condensation drain of the air conditioning unit (D).]
7. Attach the condensation drain hose (A) with a hose clamp (B) to the condensation drain of the air conditioning unit (D).
8. On installing the air conditioning unit, make sure the condensation drain is inserted in the floor panel opening (C).
9. Re-install the air conditioning unit and the remaining components removed.
10. Working from underneath, pull the condensation drain hose (A) outwards through the opening in the rear floor panel (C).
11. Secure the condensation drain hose (B) in the rear floor panel (C) from underneath as shown, taking care not to twist the condensation drain hose.

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