Not just a recharge. We diagnose the actual problem using UV dye leak detection and a professional A/C diagnostic machine. Most repairs done same day — drop off in the morning, drive away with cold air.
We inject UV dye and scan every component — pinpointing even microscopic leaks that pressure tests miss.
Live pressure readings, refrigerant levels, and compressor performance — a complete system health check.
Recover, vacuum, and recharge service. Correct refrigerant fill level for your specific vehicle.
A/C compressor and clutch replacement with quality parts and proper warranty.
Condenser and evaporator replacement when leaks or damage are found — done right, not patched.
Relays, fuses, pressure switches, and wiring — full circuit trace so no parts are replaced unnecessarily.
SM Auto is a trusted auto repair shop in Mississauga specializing in AC diagnosis, refrigerant leak detection, AC compressor replacement, condenser replacement, and R134a/R1234yf recharge services.
SM Auto is Mississauga's trusted shop for car A/C repair and auto A/C repair — from a simple recharge to a full system rebuild. Whether your car A/C is not blowing cold air or you're dealing with an intermittent cooling problem, we diagnose the root cause before touching anything. We service all makes and models at 922 Dundas St. E, Unit 6–8, Mississauga — walk in anytime, no appointment needed.
One of the most common calls we get is "my car AC is not blowing cold air." This can mean a refrigerant leak, a failed compressor, a clogged condenser, a faulty pressure switch, or a blown fuse — and you won't know which until you run a proper diagnosis. That's why every AC diagnosis in Mississauga at SM Auto starts with a full system pressure test and live data reading before we recommend any repairs. No guessing, no unnecessary parts.
For AC leak repair in Mississauga, we use a professional UV dye test — one of the most reliable methods available. We inject UV dye into the system, run the A/C, then scan every component under UV light. AC leak detection in Mississauga with UV dye finds leaks that pressure tests alone can miss — including slow leaks at the compressor shaft seal, evaporator, and condenser fittings. The AC UV dye test is included as part of every recharge we perform.
We handle both R134a recharge in Mississauga and R1234yf recharge in Mississauga — the two refrigerant types used in modern vehicles. R134a is found in most vehicles made before 2020. R1234yf is the newer, lower-emission refrigerant now standard in most newer vehicles. Our equipment handles both, and we always fill to the exact manufacturer-specified weight — not just until the pressure looks right. An incorrect refrigerant charge causes poor cooling and premature compressor wear.
When components need replacing, we handle AC compressor replacement in Mississauga and AC condenser replacement in Mississauga using quality parts with proper warranty coverage. A compressor replacement always includes a system flush, orifice tube or expansion valve service, and a new receiver/drier — because replacing the compressor alone without flushing the system sends metal debris from the failed compressor through the new one, causing it to fail prematurely. We do the job completely, not halfway.
Our full air conditioning service in Mississauga covers every part of the A/C system — from the compressor and condenser to the evaporator, expansion valve, pressure switches, and electrical controls. If you need an AC recharge in Mississauga or a complete AC refrigerant leak repair, SM Auto has the equipment, the experience, and the honest approach to get your vehicle's A/C working properly — same day in most cases.
A basic A/C recharge (recover, vacuum, recharge + UV dye test) starts at $150 flat. More complex repairs like compressor or condenser replacement are quoted after diagnosis. We always tell you the cost before starting any work.
Common causes: refrigerant leak, failed compressor, blown fuse or relay, clogged condenser, or faulty pressure switch. We diagnose the actual cause rather than just recharging and hoping for the best.
Yes — most A/C repairs including recharges, leak repairs, and electrical fixes are done same day. Drop off in the morning and pick up in the afternoon.
We fix the problem. Every A/C service includes UV dye leak detection and a full system pressure test. If there's a leak or mechanical issue, we find it and quote the repair — so your A/C doesn't fail again in 2 weeks.
No appointment needed — walk in anytime. Call ahead at (905) 277-1333 for major A/C jobs so we can have parts on hand.
Example: normal light can hide a condenser leak, but UV dye glows at the leak point under UV light.
A customer came in with a common complaint — car A/C not blowing cold air. The system had been recharged at another shop about a month earlier, but the cold air didn't last. This is one of the most frequent situations we see: a recharge without a proper leak diagnosis. The refrigerant goes in, works for a few weeks, then escapes through the same leak that was never found or fixed.
When the vehicle arrived at SM Auto, the system was already low on refrigerant again. Our first step was AC diagnosis — we connected our manifold gauge set and confirmed low side pressure was well below spec. The system had clearly lost refrigerant since the last recharge. Rather than just topping it up again, we started the leak detection process.
We added a measured amount of refrigerant to bring the system up to testable pressure, then injected UV dye. The vehicle was run with the A/C on for several minutes to circulate the dye through the full system — compressor, condenser, expansion valve, evaporator, and all hoses. This is critical: the dye has to travel through every component before you scan. Skipping this step means you might miss a leak that's further downstream.
Under normal light, the condenser looked completely clean — no staining, no visible damage, no obvious sign of a leak. This is exactly why AC leak detection with UV dye exists. We switched to the UV lamp and scanned the condenser face slowly, section by section. A small but clear bright green glow appeared at one of the condenser fins — a refrigerant leak that was invisible to the naked eye under normal light.
This is a classic AC condenser leak — one of the most common A/C failures we see in Mississauga. Condensers sit at the front of the vehicle behind the grille and take direct hits from road debris, stones, and salt. Over time, the fins corrode or get punctured, and small leaks develop that slowly drain the refrigerant. Because the leak is small, the A/C may still work for weeks before cooling performance drops noticeably.
We quoted the customer for AC condenser replacement, completed the job the same day, flushed the system, installed a new receiver/drier, and performed a full R134a recharge to the manufacturer's specified weight. The system was pressure tested after the recharge, UV lamp scanned one more time to confirm no additional leaks, and the vehicle was test driven to verify cold air output. The customer left with a fully repaired A/C — not just a temporary recharge.
The takeaway: If your A/C was recharged somewhere and stopped working again within weeks, the leak was never fixed — only the symptom was treated. At SM Auto, we find the leak first. The recharge comes after the repair, not instead of it.
No appointment needed. Drop off your vehicle or wait — we’ll take care of the rest.