Heating, Cooling & A/C in Edmonton

Five causes account for almost every no-heat call that comes in once it drops below -20. A thermostat stuck open means the engine never builds real heat at -25, usually with a P0128 code to match, and it costs you fuel economy and engine wear all winter. Low coolant from a slow leak shows up in the cabin first, because the heater core sits high in the system — heat fades at idle and returns at speed, and air trapped after a leak or a rushed repair behaves exactly the same way, which is why the fix there is a proper refill and bleed rather than parts. Third is a heater core, plugged with scale or leaking into the dash. Fourth is a blend door actuator that has stripped its gear teeth. Fifth is a blower motor and resistor losing one fan speed at a time, which you notice as weak airflow rather than cold air. Each of the five has its own fingerprint, and finding the right one first is the difference between a cheap fix and a parts-swapping spiral. We settle which one it is on the first visit, not the third.

A blend door actuator is a small geared electric motor buried in the dash. It swings the flap that decides how much air crosses the heater core and how much crosses the A/C evaporator, which is how your temperature dial works. The gears are nylon, and when the teeth strip the motor keeps hunting for a position it can't reach — that's the click, tick or tap behind the dash, usually right after you turn the key or change the temperature. The other symptoms are hot air on one side and cold on the other, or a temperature setting stuck where it last worked. Engine temperature stays normal, and that's the tell that separates this from a cooling fault. The part itself isn't expensive. What decides the bill is where it sits: some are behind the glovebox, others are buried deep enough in the HVAC box that the dash has to come apart. The mode door is the other flap in there; it decides whether air leaves at the vents, the floor or the windshield, and its actuator fails the same way with a different symptom. We tell you which one yours is before we quote it.

The symptoms arrive as a set: a sweet smell in the cabin, a greasy film on the windshield that won't wipe clear, damp carpet on the passenger side, and coolant disappearing with nothing visible under the hood. That combination points at the heater core, a small radiator inside the HVAC box with hot coolant running through it whenever the engine is warm. Coolant vapour in the cabin isn't something to breathe long-term, so it gets confirmed and repaired rather than watched. Confirmed is the important word, because of access. On many vehicles the dash, the steering column and the HVAC box all have to come out, so the labour rather than the part is most of the bill, and nobody should pull a dash on a guess. When a core is plugged instead of leaking, a flush sometimes brings it back, and that gets tried first. If it does need replacing, we price the core and, where it makes sense, a complete heater box through Eskimo Auto & Truck Parts, and let you pick. Either way the hoses, clamps and coolant go in with it, and the case drain gets cleared while everything is open.

Coolant isn't one product. There are three broad chemistries — IAT, OAT and HOAT — sold in green, orange, pink, blue and yellow, and the colour is marketing. The specification in your owner's manual is the part that matters. Mix incompatible chemistries and the additive package can drop out of suspension into a gel that plugs the narrowest passages first: the heater core and the radiator, the two worst things in the system to have plugged. It also strips the corrosion protection that keeps aluminum, water pump seals and gaskets alive. Repeated top-ups from a universal jug are how a heater core plugs. The water side matters too: concentrate has to be cut with distilled water, not tap, and a system topped up with plain water all summer loses the freeze protection you need in February. Some makes are fussier still, and we look up the specification for yours rather than reaching for the universal jug. Coolant ages out on its own too: the corrosion inhibitors deplete over years, and old coolant quietly eats water pumps, radiators and heater cores from the inside. We put in what the manufacturer specifies, and we tell you what went in.

A water pump usually warns you before it strands you. The tells are a bearing whine that rises and falls with engine speed, a drip or a crusty coloured stain at the weep hole under the pump, play in the pulley, and coolant loss with no hose or radiator leak to show for it. What matters most is where the pump lives. If it's driven by the timing belt or chain, the labour to reach it is most of the job, so the thermostat, the belt or tensioner, the hoses and fresh coolant all go in at the same time — doing them separately means paying for the same access twice. Thermostats fail in both directions and our winters kill them both ways: stuck open is the cheap, boring failure people put off all winter, and stuck closed is the one that cooks an engine in a few kilometres. There is a cold-start angle people miss, too. A block heater warms the coolant, so when the coolant is low or the thermostat is stuck open, plugging in warms the radiator instead of the engine and buys you less than it should.

If the gauge has already climbed, our engine overheating guide covers the roadside decision and what each repair tier costs. This is what happens once the vehicle is in the bay. A cooling system pressure test puts the system under the pressure the rad cap is rated for while the engine is cold, and then it is a matter of watching the gauge: a system that bleeds down over fifteen minutes has a leak even with nothing dripping on the floor, because a small leak onto a hot engine flashes off as steam before it ever reaches the ground. UV dye finds the rest. A block test answers the head gasket question with chemistry — the test fluid changes colour when combustion gas is reaching the coolant — so nobody gets quoted thousands on a hunch. Then the rad cap, which lowers the system's boiling point the day it stops holding pressure, and fan operation checked at temperature rather than in the parking lot. An engine that has already been driven hot gets checked for what the overheat took with it, not only for what caused it. Diagnostic time is $120 an hour, quoted before we start.

The compressor shaft seal and the system O-rings are lubricated by oil that circulates with the refrigerant. Switch the A/C off in September and leave it off until May and those seals dry out and harden, which is why a system that worked fine last fall comes out empty in the spring. Running the A/C, or just the defrost setting, for a few minutes a month keeps oil moving across them. Defrost is the other half of the argument. On most vehicles pressing defrost engages the compressor automatically, because A/C is a dehumidifier, and drying the cabin air is what clears fogged glass fast. A system low enough to trip the low-pressure lockout won't engage the compressor at all, so you lose fast defrost in January, not just cold air in July. A proper service isn't a can of refrigerant from the parts store. We test system performance, find leaks with dye and electronic detection, repair the leak, then evacuate and recharge to the exact weight. A performance test and recharge typically runs $150–$350 depending on the vehicle; newer vehicles (roughly 2015 and up) use R1234yf refrigerant, which costs several times more than the old R134a.

Sometimes the honest answer is that it isn't worth doing. A dash-out heater core, or a compressor on a high-kilometre vehicle, can cost more than the vehicle is worth no matter what the parts cost, and if that is where yours lands we will say so instead of booking the job. Where the repair is worth doing, the parts side helps. Our sister company, Eskimo Auto & Truck Parts, is one of Edmonton's largest auto recyclers and parts operations, which puts recycled genuine OEM compressors, condensers, radiators, blower motors and complete heater boxes within reach — the same parts the vehicle left the plant with, at a real discount from new. That is usually what decides a compressor on a fifteen-year-old sedan, a radiator on a truck you're keeping two more winters, or a heater box on something with 300,000 km showing. If you're keeping the vehicle, we'll also tell you what else in the system is close to going. If you're selling in the spring, say so; the right repair on a keeper isn't always the right one on a trade-in.