Removing and installing temperature sensor G18 — AUDI

🧭 Before you start

Fits: Audi A5 (8T, 2007–2016), Audi Q5 (8R, 2008–2017), Audi A4 B8 (8K, 2007–2015); platform code 83

• Renewed: o-ring

📋 Procedure

1. Switch off ignition (and auxiliary heater).
2. Remove auxiliary heater .
3. Detach add-on components of auxiliary heater .
4. Dismantle auxiliary heater .
5. Remove the cover for the combustion air blower V6 (dismantling and assembling auxiliary heater ).

6. Press the black wires out of the 14-pin connector housing to the auxiliary heater control unit J364 (contacts 10 and 11).
7. Unscrew bolt (1) and detach retaining clip.
8. Pull out temperature sensor G18(2). [Note: There are different versions of the retaining clip for the temperature sensor G18 and the temperature sensor 2 for supplementary and auxiliary heating G587. J364 with part number 8xx xxx xxx must only be fitted with retaining clips (B) without a spacer ring. J364 with part number 4xx xxx xxx must only be fitted with retaining clips (A) with a spacer ring (C).It is therefore important to observe the correct assignment (matching part numbers of retaining clip and auxiliary heater control unit J364) and Electronic parts catalogue.]
9. ⚠ If a retaining clip has not been properly fitted or the wrong version is used, coolant will escape when the pressure increases in the coolant circuit.If a retaining clip has not been properly fitted, G18 or G587 may work loose.Ensure correct assignment and proper fitting of the retaining clip. — Clean connection area and temperature sensor G18 and check for damage.
10. Renew O-ring.
11. Coat O-ring with small quantity of coolant.

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