Real questions from real customers — answered straight, the same way I'd answer them standing in your driveway. No shop talk you need a translator for. If your question isn't here, call or text 661-888-3941 and ask me. If it's a good one, it ends up on this page.
My AC and my heater both stopped working. I replaced the blend door actuators myself and it's the same. Is my compressor dead?
If hot AND cold are both gone and new actuators didn't change anything, it's probably not your refrigerant and probably not the compressor — it's up in the HVAC controls, and replacement actuators usually need calibration before they'll sweep right. Quick check: if you hear the compressor clutch click on, the compressor is most likely not "dead." And don't add refrigerant — overcharging a system that isn't low makes everything worse. This one needs a real diagnosis, not parts swapping.
I opened my AC system, changed the O-rings, and charged it with a can from the auto parts store. Why is it still warm?
Because the second you open that system, air and moisture rush in — and the desiccant bag inside soaks up that moisture until it's spent. Without pulling a deep vacuum, the air stays in the system. And a can charges by pressure guesswork, not by weight: if your system specs 19 oz and you got about 15 oz of refrigerant plus air and water, it'll never blow cold and the compressor works overtime. A proper service is: evacuate, deep vacuum, oil + UV dye, then a weighed charge.
Can't I just use a $70 recharge can from the auto parts store?
You can — people do every day, and then they call me. A can can't find your leak, can't pull a vacuum, can't measure what's actually in the system, and it's very easy to overcharge, which raises pressures and cooks compressors. If your system is low, it's low for a reason: refrigerant doesn't get "used up," it leaks. The can treats the symptom for a few weeks; a real service finds the cause.
Does car AC refrigerant wear out or get used up?
No. It's a sealed system — the refrigerant circulates forever. If it's low, there's a leak, period. Topping off without finding the leak is renting cold air. That's why my service includes UV dye: so the leak shows itself under a blacklight instead of guessing.
How long does a mobile AC service take?
1–2 hours, right in your driveway or at your workplace. Full service: inspection, evacuation of the old refrigerant, vacuum test, oil + dye, and a full recharge by weight.
How much does it cost?
The full mobile service is $150 flat — I come to you. If your system won't hold a charge, the visit converts to a $100 diagnostic so you know exactly what's wrong before you spend another dollar. Condenser replacement starts at $350 labor (includes evac + recharge) plus the part.
What happens during a mobile AC service visit?
I hook up professional gauges and check pressures, inspect the system, evacuate the old refrigerant, pull a vacuum to test for leaks and boil off moisture, add the correct oil + UV dye, and recharge with exactly the weight of refrigerant your car specs. Then I verify vent temps before I leave. 1–2 hours, no shop visit.
Why does my AC smell musty when I turn it on?
Mold and bacteria growing on the evaporator — it's dark, wet, and warm in there, perfect for it. Mild cases are just funk; left alone it gets worse and can mean a clogged evaporator drain. A service visit can tell you which one you've got.
Why is my AC cold on the freeway but warm at stoplights?
Cooling depends on airflow across the condenser. At speed, the road does the work; at idle, your condenser fan has to — if the fan is weak or dead, or the charge is low, it shows up first at stoplights. It's a classic symptom with a short list of causes, all diagnosable with gauges on the car.
What is PAG oil, and why does it matter?
PAG oil is the lubricant that circulates with the refrigerant and keeps the compressor alive. Wrong oil, wrong amount, or oil starved by a low charge = a compressor wearing itself out. Low refrigerant doesn't just blow warm — it starves the compressor of the oil it's supposed to carry. That's the expensive ending to a "small" leak.
What does UV dye do?
I add a fluorescent dye to the system during service. It circulates with the refrigerant and escapes at any leak point, where it glows under a UV light. Next time there's a question about where refrigerant is going, the answer is visible instead of guessed.
What's ICE32? Does it make my AC colder?
ICE32 is a lubricant additive (made by Four Seasons — it's factory-loaded into their compressors) that goes in during a recharge. It reduces friction inside the compressor and improves heat transfer, so on a healthy, properly charged system the cabin typically cools a little faster and vent temps can drop a few degrees — biggest difference on older systems. The bigger value is compressor protection: less friction, less wear on the most expensive part of the system. It is NOT a fix for a leak, a low charge, or a failing compressor. Ask about adding it when you book.
Do you really come to me? Where do you serve?
Yes — the whole service happens at your home or workplace. I cover the San Gabriel Valley, San Fernando Valley & Santa Clarita Valley: Pasadena, Altadena, Burbank, Glendale, Santa Clarita, Van Nuys, El Monte & nearby.
Need your AC checked? Call or text 📞 661-888-3941 — Mobile Car A/C, we come to you.