Your AC stopped cooling in Kingman. Here's what it usually is.

First, the two-minute check

Before anything else, confirm the system is actually being asked to run. A surprising share of no-cool calls in summer are a thermostat set to fan on instead of auto, which blows room-temperature air continuously and feels exactly like a broken compressor. Set it to Cool and the fan to Auto, then drop the setpoint five degrees below room temperature and listen for the outdoor unit.

Then look at the filter. A filter that has been in place through a monsoon season in Mohave County is not dirty, it is sealed. Restricted airflow across the indoor coil drops the coil below freezing, ice forms, and airflow stops entirely. If you find a block of ice on the copper lines at the indoor unit, shut the system off at the thermostat, leave the fan running, and let it thaw for a few hours before anyone puts gauges on it — a frozen system cannot be diagnosed accurately.

1. The run capacitor

This is the single most common failure we see in desert climates, and it is a heat problem. A capacitor is what gives the compressor and condenser fan the jolt they need to start turning. It is rated for a temperature that a rooftop in Golden Valley or Kingman exceeds routinely, and heat shortens its life every summer until it will not hold a charge.

The symptom is distinctive: the outdoor unit hums but the fan does not spin, or it starts, runs a few minutes, and trips. It is a small part and a short visit. It is also the reason we push maintenance visits — a capacitor that has drifted out of tolerance can be measured and replaced in the spring for a fraction of what an emergency call costs in July.

2. The contactor

The contactor is the relay that closes and sends power to the outdoor unit. Out here they collect dust and insects, and the contacts pit and weld over time. A contactor that has welded shut keeps the compressor running when the thermostat is satisfied. One that will not close does nothing at all. Either way it is a visible, testable part.

3. Low refrigerant — which means a leak

This one matters more than most homeowners are told. Refrigerant is not consumed. A sealed system does not use it up the way an engine uses oil. If a system is low, refrigerant left through a hole, and adding more without finding that hole buys you one season at most.

Anyone who tops a system off without a leak search is selling you the same repair again next year. We look for it — usually at the evaporator coil, the service valves, or a line set that has been rubbing against something in an attic for fifteen years.

The cost conversation changes sharply here depending on what your system uses. R-22 systems were phased out of production in 2020, and the reclaimed supply that remains is priced accordingly. On a system that old, a significant leak repair is usually the moment to have the repair-or-replace conversation honestly.

4. The condenser coil is packed

The outdoor unit rejects heat by pulling air across a coil. In Mohave County that coil collects dust, cottonwood, and whatever the last haboob carried through. When it clogs, head pressure climbs, the system runs constantly, cools poorly, and eventually trips on high pressure.

You can see this one yourself. Look through the fins of the outdoor unit toward the center — if you cannot see daylight, it is restricted. Rinsing it gently from the inside out with a garden hose, with the power off at the disconnect, is genuinely useful homeowner maintenance. A pressure washer is not; it folds the fins flat and makes the problem permanent.

5. The compressor

This is the expensive one, and it is the least common of the five. A compressor that has failed electrically will usually trip the breaker immediately. One that has failed mechanically will hum, draw locked-rotor current, and go nowhere.

A compressor rarely dies on its own. It dies because something else was wrong for a long time — a low charge running it hot, a failed capacitor making it strain on every start, a packed condenser coil pushing head pressure past its limit. That is the argument for fixing the small things when they are small.

What decides the bill

Three things, in order: which part failed, whether the system is still under manufacturer parts warranty, and what refrigerant it uses. A capacitor on a ten-year-old R-410A system and a compressor on a twenty-year-old R-22 system are not in the same universe of cost, and any honest shop will tell you which one you are looking at before it starts.

We are a Trane Comfort Specialist, which means we can check registered warranty status on the spot for a lot of the equipment in this county — and a part that is still covered is a part you should not be paying for.

If it is 112° and you need someone now

Call (928) 565-6440. We run emergency service Monday through Saturday and a live person answers. We cover Kingman, Bullhead City, Lake Havasu City, Fort Mohave, Golden Valley, Mohave Valley and Topock, plus the outlying runs to Dolan Springs and Meadview.