2026-07-21 · 4 min read
Toyota Alphard Aircond Not Cold Malaysia
Toyota Alphard Aircond Not Cold guide and repair information for Malaysia owners.
Alphard dual-zone A/C complaints come in two forms: both zones not cold (compressor or refrigerant issue) or only the rear zone not cold (rear evaporator issue). Correctly identifying which scenario saves money by avoiding unnecessary front-system work.
Both Zones Not Cold — Compressor or Refrigerant
If both front and rear A/C zones are not cold simultaneously, the issue is upstream of both evaporators: refrigerant leak, failed compressor, clogged condenser or blocked expansion valve. Alphard uses R134a refrigerant (H30) or R1234yf (H40). Check: is the compressor clutch engaging when A/C is switched on? If not — compressor or electrical issue. If yes but still warm — refrigerant leak or clogged condenser. Regas cost. Compressor.
Front Cold But Rear Not Cold — Rear Evaporator
If front A/C blows cold but rear does not — the rear expansion valve, rear evaporator or rear blower motor is the issue. The most common cause in Malaysian Alphard units: rear evaporator clogged with mould (owners only service the front unit and forget the rear). Chemical wash the rear evaporator. If the rear blower motor is seized for replacement. Replace rear cabin filter at the same time — always do front and rear together.