Perodua Kelisa with weak midday cooling and selection of original Denso parts

Sifu White explains what happened

Prices, repair times and warranty terms mentioned in the video applied at the time. Ask the workshop about current arrangements.

Today we are discussing a Perodua Kelisa. The customer complains that the air-conditioning is not cold enough, especially at midday, and asks Sifu White what should be replaced. Finding original parts for this model is challenging. Original piping, for example, is now difficult to obtain, but we found a Denso unit described as the last available stock.

The previously installed cooling coil was not an original Denso unit; it was a smaller and shorter China-made OEM part. We managed to source the correct Denso cooling coil. It was not inexpensive, but the customer agreed because they wanted good parts and a proper repair.

Sifu explains that parts on the market differ in quality. For important components, he prefers a new unit from a reliable source rather than one of uncertain origin.

For this case, we recommend a new unit rather than a reconditioned one. In Sifu's experience, some reconditioned units still leak oil or have noisy bearings because they are merely opened and cleaned without replacing worn seals or bearings. This leads to workshop returns, which are inconvenient for the customer. Regardless of the model, we will try to repair the air-conditioning problem correctly.

What to compare before repairing or replacing a part

A similar shape, a logo or a seller’s use of “original”, “OEM” or “recon” does not establish suitability on its own. Model, year, engine configuration, part number and connections need matching. Supply traceability, actual condition and warranty terms are separate checks. New components still need inspection before and after installation, while used components need particular attention to their history and the basis on which they have been tested.

The value of a component repair also depends on the assembly’s internal condition and the availability of suitable repair parts. An external clutch fault can require a different solution from internal wear or contamination. Compare labour, related system work, the possibility of having to dismantle the assembly again and written coverage as well as the part price. Prices, turnaround times and warranties mentioned in a historical video do not automatically apply to another vehicle.

Why hot weather or idling can reveal a cooling problem

Air-conditioning has to move cabin heat outside. Hot weather and sun-heated seats and trim increase the cooling load, while airflow through the condenser affects heat rejection. Airflow conditions change between driving and standing still. “Warm at idle, colder while moving” is therefore a useful clue, but it does not prove a fan failure without testing the fan, refrigerant circuit and relevant operating conditions.

Assessment can include condenser and radiator condition, fan operation, engine-cooling data and refrigerant specification. Some vehicles change A/C operation when engine or other protection conditions are active. Vent temperature also depends on ambient conditions, humidity, recirculation and fan speed. A reading from one video is not a universal pass mark for every car. Meaningful before-and-after comparisons should record comparable test conditions.

What to tell the workshop about your own car

You do not need to guess a part name first. A clear description of what actually happens is often more useful for reproducing the complaint than requesting a particular replacement.

• Bring earlier quotations, part numbers and warranty records.
• Compare idling, driving, midday and evening behaviour.
• Include the model, year, recent repairs and what changed before or after the symptom began.