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In Canada your car needs to handle both ends of the thermometer. A weak A/C is annoying in July, but a heater that does not work at minus 25 is a safety issue, since it also keeps your windshield clear. This page covers what usually goes wrong with each system, typical repair prices, and when a quick fix is not really a fix.
Last updated: October 2026
A technician checks pressure, looks for leaks and refills refrigerant. If the system keeps losing refrigerant, there is a leak that needs to be found.
Leaking hoses, seals and condensers are common. A failed compressor is the most expensive part of the system.
Weak or no heat can come from a thermostat, low coolant, a clogged heater core or a failed blower motor.
A clogged filter reduces airflow and can cause odours. It is one of the cheapest fixes.
Typical ranges only. Newer vehicles that use a different refrigerant type cost more to recharge.
Often low refrigerant from a leak, but it can also be a compressor or electrical issue.
A clogged cabin filter or failing blower motor.
Low coolant, a stuck thermostat or a clogged heater core.
Could be a heater core leak. Coolant fumes should not be breathed in.
Moisture and bacteria in the system. A cleaning and a new filter usually help.
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In a healthy system, never. It is a sealed system, so if it needs regular refills, there is a leak. Ask for a leak test instead of repeat recharges.
The most common causes are low coolant, a thermostat stuck open, air in the system, or a clogged heater core. A shop can check each in a short time.
Yes. The A/C compressor helps remove moisture from the air, which is why defrost modes often turn it on automatically to clear a fogged windshield faster.
Many manufacturers suggest once a year or every 15,000 to 25,000 km. Dusty roads and city traffic mean sooner.