A car raised on a two-post lift in the workshop.

The AC is cold when moving but warm in traffic

This particular pattern is one of the more informative things an air conditioning system can do, because it points at heat rejection rather than at the refrigerant circuit itself. Moving, the condenser at the front of the car gets airflow for free; stopped in traffic, it depends entirely on the cooling fans. A system that cools properly at 80 km/h and gives up at a standstill is usually failing to shed heat at the front — fans not coming on or running at the wrong speed, a condenser blocked with dust and flies, or a system carrying the wrong charge, which raises pressures until the fans cannot keep up. In this climate that last one matters: a marginal system passes in February and fails in July.

Can I keep driving it?

Safe to drive

Nothing here will strand you or is unsafe, so drive it. It is worth not leaving it, though, for a reason that is about money rather than risk: if the cause is a low charge then the system is leaking, and running a leaking system low on refrigerant also runs it low on the oil that refrigerant carries, which is how an air conditioning bill becomes a compressor.

How we find out which one it is

Leak testing, regas, compressor and evaporator work.

  1. 01

    We measure before we guess

    Vent temperature and both system pressures are checked with the engine at temperature. Together they narrow the fault to a short list before anything is dismantled.

  2. 02

    We find the leak before we quote

    If the system is low, it is leaking. We trace it and tell you which component it is — condenser, hose, o-ring, compressor seal or evaporator — and what that specific repair costs, so the job you approve is the one the car actually needs rather than another refill.

  3. 03

    You approve the price, line by line

    Parts and labour are quoted separately. You approve each line before we start. Nothing is fitted that you have not agreed to.

  4. 04

    The car proves it, not us

    The vent is checked again at the end, in the same conditions as the first check, before the car is handed back. Cold is something you feel at the vent on the way out, not something a workshop tells you it achieved.

The job that investigates this: Car AC repair

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