Removing and installing temperature sensor G18 and temperature sensor 2 for supplementary and auxiliary heating G587 — AUDI
Removing and installing temperature sensor G18 and temperature sensor 2 for supplementary and auxiliary heating G587 on Audi: 14 steps.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A4 B9 (8W, 2015–)
- Renewed: o-ring
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- Replace O-ring after removing.
- Make sure the retaining clip (A) always has a spacer ring (C).
📋 Procedure
- Remove the auxiliary/supplementary heater .
- Detach the add-on components from the auxiliary/supplementary heater Exploded view of fitting locations - auxiliary/supplementary heater, add-on components.
- Detach the holder from the auxiliary/supplementary heater Exploded view of fitting locations - auxiliary/supplementary heater, holder.
- Remove the control unit .
- If the temperature sensor and/or the temperature sensor 2 is/are replaced, unpin the wires from the contacts at the connector housing (with the exception of pins 7, 8, 10 and 11).
- Screw out the bolts (1, 6).
- Detach the retaining clips (2, 5).
- Pull out the temperature sensor G18(3).
- Detach the temperature sensor 2 for supplementary and auxiliary heating G587(4).
- Detach the connector housing with the temperature sensors. [Note: Replace O-ring after removing.]
- Clean connection area and temperature sensor G18 and check for damage.
- Moisten the new O-ring (7) with a small quantity of coolant.
- Make sure the retaining clip (A) always has a spacer ring (C).
- ⚠ In the event of an incorrectly fitted retaining clip or use of the wrong version, coolant will escape when the pressure increases in the coolant circuit.If a retaining clip has not been properly fitted, G18 may work loose.Ensure correct assignment and proper fitting of the retaining clip. — Make sure the retaining clip (A) always has a spacer ring (C).
Other AUDI procedures
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.