By the WY&G, Inc. team: licensed HVAC contractor, CSLB C-20 #1044922, over 25 years and thousands of customers in the Santa Clarita Valley and Orange County.
Why fall is hard on an AC here
By October your system has run for five months. Capacitors weaken with heat, filters are loaded with summer dust, and the condensate drain has had all season to grow slime. Then a Santa Ana event hits: hot, dry wind for a few days, often with ash or dust in the air. The AC is asked to run full time again, with a dirtier coil and tired parts. That is when weak parts finally quit.
What usually breaks in October
- Outdoor fan hums but does not spin. A run capacitor that survived the summer but is now too weak. It is the most common AC part we replace.
- AC runs but the house will not cool down. A filter and outdoor coil packed with dust and ash after windy days. Airflow drops and the system cannot move heat out.
- Water near the furnace or air handler. The condensate drain line clogged over the summer, or the float switch shut the system off to protect your ceiling.
- AC trips the breaker on a hot afternoon. A struggling compressor start, a failing fan motor or a loose connection. Repeated tripping means stop resetting and get it checked.
After a windy day: a 10 minute check
- Replace the air filter. After Santa Ana winds, check it even if it is not due. A gray, dusty filter is enough to freeze the coil.
- Walk around the outdoor unit. Pull out leaves, palm fronds and anything the wind pushed against it. Keep about 2 feet clear on all sides.
- With the power off at the disconnect, rinse the outdoor coil gently with a garden hose. No pressure washer, the fins bend easily.
- Look at the drain line where it exits the house. If it is dry while the AC runs on a hot day, it may be clogged.
- If you see ice on the copper line, switch the system to Off and the fan to On for a few hours before you call. Running a frozen system can hurt the compressor.
Stop there. Capacitors hold a charge even with the power off, and refrigerant work needs an EPA certified technician.
Smoke and ash: protect the indoor air
When there is fire smoke in the area, set the thermostat fan to On so the filter keeps cleaning the air, close windows, and use the best filter your system is rated for. A MERV 11 or 13 filter catches far more fine particles than a cheap fiberglass one, but very thick filters can choke older systems. If you are not sure what your system can handle, ask us during a visit. Change the filter again once the smoke clears.
Fall is a good time to fix it, not just limp along
Repairs are easier to schedule in the fall than in July. If your AC barely made it through summer, a fall repair or tune-up means it starts next season healthy. We can check the cooling and heating sides in one visit, since the furnace starts working in a few weeks anyway. See AC repair and AC tune-up.
