At low A/C loads and low blower setting (min
Mercedes-Benz technical service bulletin LI83.30-P-081030 for 2026 Mercedes-Benz CLA250, 2026 Mercedes-Benz Cla 250 4matic and 2026-2027 Mercedes-Benz Cla 350 4matic (EV).
- Bulletin number
- LI83.30-P-081030
- Component
- Visibility/wiper
- Summary
- Complaint At low A/C loads and low blower setting (min. to 2), loud hissing noises can be clearly heard from the area of the air conditioner box (particularly when the vehicle is stationary). Cause Discharge noises at the evaporator expansion valve which are transmitted into the interior compartment. Remedy Change in position of evaporator expansion valve Work instructions: Fabricate an adapter wiring harness as described below Parts required for modifying chiller valve module: A1748308402 evaporator A1748308502 refrigerant line A1748308602 refrigerant line A1748308902 refrigerant line A1748300003 expansion value A0239976345 profile sealing ring A0239976545 profile sealing ring A2478304602 mounting plate incl. installation material Work procedure 1. Prepare vehicle 1. Remove frunk as per WIS instructions AR88.40‑P‑1102CLA. 2. Remove old components 1. Remove evaporator as per WIS instructions AR83.30‑P‑5543CLA. 2. Remove following refrigerant line: a. A1748300002 b. A1748301702 c. A1748302002 d. A1748302402 3. Remove expansion valve as per WIS instructions AR83.30‑P‑5520CLA. 3. Install new components 1. Install HVAC adapter (A1748300003) using previously removed screws. (Installation material of mounting plate is not required) 2. Install new A/C lines as well as new evaporator (A1748308402). 3. Install adapter wiring harness XXX. 4. Secure adapter wiring harness using mounting plate. 4. Concluding work 1. Install/enter equipment code S18 on data card of vehicle. 2. Perform Xentry quick test and erase fault memory 3. Check vehicle to ensure that air conditioning system is functioning correctly.
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