A/C Not Cold: Recharge, Leak, or Compressor?

Montreal summer with the humidex exceeding 40°C is not the time for a failing A/C. At the shop, as soon as May hits, the calls for "air not cold" start pouring in.

At the shop, we'll explain the most common causes and how we diagnose the problem.

Possible Causes

1. Low Refrigerant Level

Most common cause. Refrigerant can slowly leak over time. A recharge may suffice if the leak is minor.

Cost: $100 to $200 for a recharge.

2. System Leak

If refrigerant drops too fast, there's a leak to locate and repair. Seals, condenser, or evaporator may be involved.

Cost: $200 to $800 depending on leak location.

3. Failing Compressor

The compressor is the system's heart. If it doesn't engage or makes noise, it's a bigger repair.

Cost: $500 to $1,500 depending on the vehicle.

4. Fan or Condenser

A non-working radiator fan or clogged condenser can prevent cooling.

How We Diagnose

System pressure check (high and low).
Compressor operation test.
Leak detection with UV detector.
Visual inspection of condenser and components.

Key Takeaways

A recharge costs $100–$200 and often solves the problem.
If the cold doesn't last, there's probably a leak.
Compressor is the costliest repair ($500–$1,500).
Get the A/C checked in spring, before the heat wave.
Combine with your tire change, brake and alignment check.

Frequently Asked Questions

How often should I recharge the A/C?

In theory, never — the system is sealed. If you need to recharge, there's a leak somewhere.

Can I use a store-bought recharge kit?

Possible but risky. Overcharging can damage the compressor. We recommend professional service.

How long does an A/C diagnostic take?

About 30 to 60 minutes for a complete diagnosis.

Does A/C use a lot of gas?

Yes, about 5% to 10% more. But it's better than driving with windows down at high speed, which uses about the same.

When should I get the A/C checked?

In spring, before the heat. Don't wait for the July heat wave.

Want us to check this quickly?

Garage Path57 — 7971 15e Ave, Montreal, QC H1Z 3N5

Call us or Book your visit for an A/C diagnostic.

Garage Path57 · 7971 15e Avenue, Montréal (QC) H1Z 3N5 · (514) 433-7479