Troubleshooting Ride-Along: My AC Stopped Cooling Completely — What Happened?
“My AC isn’t working.”
That’s usually about all we know when the phone rings.
And honestly, that’s enough.
You don’t need to know whether you have a bad capacitor, refrigerant leak, failed compressor, thermostat problem, or something called a TXV.
That’s our job.
But there are a couple of things you can tell us that are incredibly useful:
What is the system doing—or not doing?
And when did it start?
On this particular service call in Palm Coast’s B Section, those two questions told us quite a bit.
Unfortunately, the answer to the second one also earned a small internal eye roll.
Customer Complaint
“My AC isn’t doing anything.”
Okay.
So we started with the first question:
“What is it doing—or not doing?”
Right now?
Nothing.
But what was it doing before that?
The homeowner explained that the system had originally been cooling. Then the air coming from the vents started getting warmer.
Over time, it got warmer still.
Eventually, it stopped providing any meaningful cooling at all.
That’s important.
Because that’s a very different story from:
“It was working perfectly yesterday, and this morning it wouldn’t turn on.”
So we asked the next question:
“When did this start?”
The answer:
“Several months ago.”
Several.
Months.
😑
Okay then.
That would have been excellent information several months ago.
But it was still extremely useful now.
Because a problem that gradually gets worse over several months points us in a very different direction than something that suddenly dies overnight.
The Timeline Is Part of the Diagnosis
This is why we ask questions before we start taking things apart.
Imagine two homeowners call us with exactly the same complaint:
“My AC isn’t cooling.”
One says:
“It was working perfectly yesterday. There was a thunderstorm last night, and this morning it was dead.”
The other says:
“It hasn’t really been cooling well for months. The air gradually got warmer and warmer, and now it doesn’t cool at all.”
Same symptom today.
Completely different history.
We’re probably not starting those two service calls in the same place.
The homeowner doesn’t need to know why.
Just tell us the story.
What was it doing?
What stopped happening?
When did you first notice it?
Did anything change around that time?
Sometimes the timeline is one of the best diagnostic tools we have.
Then We Met the Air Conditioner
And this particular AC had another piece of information for us.
It was installed during the Clinton administration.
Seriously.
This thing had been cooling a Palm Coast house through multiple presidents, flip phones, dial-up internet, and whatever else Florida had thrown at it.
At that point, the age certainly mattered.
But it still didn’t diagnose the problem.
Old air conditioners are allowed to have repairable problems too.
So we didn’t look at the equipment and say:
“Yep. Old. Replace it.”
We still tested it.
We wanted to know what had actually failed before deciding whether repairing it made any sense.
What We Found
When we checked the refrigeration system, we found essentially no refrigerant left.
Now the homeowner’s description became even more useful.
Remember the progression:
The AC cooled.
Then it didn’t cool quite as well.
Then the air became progressively warmer.
Eventually, it wasn’t providing meaningful cooling at all.
And this had been happening over several months.
The measurements matched the story.
The system had lost its refrigerant charge.
Where Did the Refrigerant Go?
This is one of the most important things for homeowners to understand about air conditioning:
Refrigerant isn’t fuel.
Your AC doesn’t burn it.
It doesn’t normally need to be “topped off” because you’ve been using the air conditioner too much.
Refrigerant circulates through a sealed system.
So if we find an air conditioner with essentially no refrigerant remaining, it went somewhere.
There’s a leak.
Where?
We didn’t know.
Finding that would require further investigation.
And on a different system, that’s exactly what we might recommend doing.
But now we had another decision to make.
Could We Leak-Search It?
Absolutely.
We could leak-search an air conditioner installed during the Clinton administration.
The better question was:
Should we recommend that the homeowner spend the money to do it?
Finding the leak is only the beginning.
First, we’d have to determine where the refrigerant escaped.
Then we’d have to determine whether the leaking component could be repaired or needed replacement.
Then we’d have to repair it.
Pressure-test the refrigeration circuit.
Evacuate the system.
Restore the proper refrigerant charge.
Commission everything again.
And when we’re finished, we still have an air conditioner that remembers dial-up internet.
Technically repairable and financially sensible aren’t always the same thing.
The Age Matters — After the Diagnosis
That’s an important distinction.
We didn’t recommend replacement because:
“Your AC is old.”
We diagnosed the problem first.
The system had essentially lost its refrigerant charge.
That meant there was a leak somewhere in the refrigeration circuit.
Then we considered that diagnosis in the context of the equipment’s age and overall condition.
That’s very different from walking into someone’s house, seeing old equipment, and immediately starting a replacement estimate.
If this had been a much newer system, finding and repairing the leak could make perfect sense.
On this system?
We didn’t think continuing down that road was a good use of the homeowner’s money.
So the Service Call Became a Free Estimate
And that’s where this one ended.
We stopped.
No giant repair proposal.
No:
“Let’s dump some refrigerant in it and see how long it lasts.”
No expensive leak-search rabbit hole followed by an expensive repair on equipment that had already provided several decades of service.
We explained what we found.
Then the service call became a free system-replacement estimate.
Sometimes troubleshooting ends with a capacitor.
Sometimes it ends with a thermostat.
Sometimes it ends with a refrigerant leak that’s absolutely worth finding and repairing.
And sometimes it ends with:
“Yeah…we probably shouldn’t put money into this one.”
That’s still a diagnosis.
Why Didn’t We Just Add Refrigerant?
Because we hadn’t fixed anything.
If refrigerant disappeared from a sealed system, adding more doesn’t repair the place where it escaped.
Could adding refrigerant potentially make the AC cool again temporarily?
Possibly.
But this system had essentially lost its entire charge.
And according to the homeowner, its performance had been declining for months.
We weren’t interested in selling an expensive refill without addressing why the system became empty.
That’s not much of a repair.
It’s a countdown.
What If the System Had Been Newer?
Completely different conversation.
This is why we don’t have a rule that says:
“Refrigerant leak = replace the AC.”
Suppose we find the same problem on a much newer system.
Now leak detection and repair may make perfect sense.
We might inspect the coils and connections.
Use electronic leak detection.
Pressure-test the system.
Or isolate different portions of the refrigeration circuit to determine exactly where the leak is.
We’ve done exactly that.
On another Ride-Along at a seven-story beachfront building, we had a system repeatedly losing refrigerant.
Two other technicians had already been involved, and the system had been refilled.
Instead of assuming the outdoor coil was leaking because it was sitting on a roof near the ocean, we isolated the indoor equipment, outdoor equipment, and refrigerant lines from one another.
The equipment held pressure.
The refrigerant piping didn’t.
We eventually isolated the problem to the liquid refrigerant line running through the building.
That was worth finding.
This Palm Coast B Section system was a completely different decision.
Same general category of problem.
Different equipment.
Different economics.
Different recommendation.
Other Reasons Your AC Can Stop Cooling Completely
Our B Section system had lost its refrigerant charge.
That doesn’t mean:
“My AC stopped cooling = refrigerant leak.”
There are plenty of other possibilities.
The capacitor may have failed
We’ve had this exact homeowner complaint with a considerably simpler repair.
The indoor blower can continue running while the outdoor equipment isn’t operating correctly because of a failed capacitor.
From inside the house:
“The AC is running.”
Outside:
Well…
Some of it is.
That’s why we verify which components are actually operating.
The compressor may not be running
Sometimes the outdoor fan is spinning but the compressor isn’t operating.
From ten feet away, the outdoor unit sounds like it’s running.
Technically, it is.
But without the compressor doing its job, we’re not accomplishing much air conditioning.
Now we need to determine why the compressor isn’t operating.
Electrical issue?
Capacitor?
Control problem?
Safety condition?
Failed compressor?
Those are very different repairs.
The outdoor fan may have failed
The condenser needs airflow to get rid of the heat removed from your house.
If the outdoor fan isn’t operating correctly, the system can develop abnormal conditions and may stop cooling properly or shut itself down.
The fan motor could be bad.
Or something controlling or powering it could be the actual problem.
“Fan isn’t spinning” tells us where to look.
It doesn’t tell us which part to replace.
The indoor blower may not be running
We’ve seen this one too.
On a Flagler Beach service call, the evaporator coil was freezing because the indoor blower wasn’t operating when it should have been.
The obvious answer might have been:
Bad blower motor.
Except the blower motor could run.
The thermostat wasn’t properly turning the indoor fan on while allowing the compressor to continue operating.
That caused the coil to freeze.
Same general complaint:
“My AC isn’t cooling.”
Completely different cause.
The evaporator coil may be frozen
A heavily frozen indoor coil can eventually restrict airflow so badly that very little conditioned air reaches the house.
And ice does not automatically mean:
“Low refrigerant.”
Airflow problems can freeze a coil.
Blower problems can freeze a coil.
Control problems can freeze a coil.
Refrigerant problems can freeze a coil.
A metering-device problem can freeze a coil.
Ice is a symptom.
We still have to find out why it’s there.
There may be an electrical or control problem
Thermostats fail.
Wires break.
Boards fail.
Breakers trip.
Disconnects get turned off.
Safety switches open.
Sometimes an AC that appears completely dead has a relatively straightforward electrical explanation.
And this is another place where the timeline helps us.
“It slowly got worse for several months.”
and:
“It stopped instantly during a thunderstorm.”
are two very different stories.
A drain safety may have shut the system down
This one confuses homeowners all the time.
Your AC stops working.
Maybe the thermostat even goes blank.
Naturally, you assume there’s an electrical problem.
Then we find water in a drain pan and a float switch doing exactly what it’s supposed to do.
The AC isn’t necessarily broken.
It’s protecting your house from water damage.
Considering we’ve also seen what happens when a clogged drain doesn’t have a safety switch, we’re pretty big fans of this outcome.
The thermostat may be the problem
Never underestimate the innocent-looking thing hanging on the wall.
Especially if the conversation goes:
“When did this start?”
“Yesterday.”
“Did anything change yesterday?”
“Well…my husband installed a new Nest.”
Okay.
That’s useful.
We’re probably starting there.
Sudden Failure vs. Gradual Failure
This B Section call is a perfect example of why these aren’t the same thing.
If your AC worked perfectly yesterday and is completely dead today, we’re interested in things capable of causing a sudden failure.
If it slowly lost cooling capacity over several months before finally becoming useless, we’re interested in that progression.
Neither timeline diagnoses the equipment by itself.
But it changes where we start.
And good troubleshooting has a lot to do with knowing where to start.
Don’t Clean Up the Story for Us
This may sound strange, but when you call for AC service, don’t worry about giving us the “right” answer.
You don’t need to say:
“I believe my system has a low refrigerant condition.”
Actually, please don’t feel like you have to say that.
Tell us:
“It used to blow really cold. A few months ago it started getting warmer. It kept getting worse, and now it doesn’t cool at all.”
That’s fantastic information.
Or:
“It worked until we changed the thermostat.”
Fantastic information.
Or:
“It has never cooled properly since we moved into the house.”
Fantastic information.
Or:
“The roofer was in the attic yesterday and now the bedroom has no air.”
Also fantastic information.
Possibly less fantastic for the roofer.
Your observations are useful.
We’ll handle the HVAC vocabulary.
Could Calling Earlier Have Changed This One?
Maybe.
We’re not going to beat the homeowner up for waiting.
People have jobs.
Bills.
Families.
And if an AC is still sort of cooling, it’s very easy to tell yourself:
“It’s probably fine.”
But a system that is gradually losing cooling performance is giving us information.
If your AC used to keep the house comfortable and the air coming from the vents has become progressively warmer over weeks or months, we’d rather investigate while it’s still operating.
Maybe we catch a repairable problem earlier.
Maybe we discover a refrigerant leak.
Maybe it’s something completely unrelated.
Or maybe we tell you everything is operating normally.
But waiting until:
“It doesn’t do anything anymore”
does tend to narrow everyone’s options.
What This Means for You
The homeowner in Palm Coast’s B Section called because the AC had finally stopped cooling.
But the story didn’t begin that day.
The system originally cooled.
Then the air gradually became warmer.
Cooling performance continued declining.
Eventually, there was essentially no cooling left.
And when we asked when this started?
Several months ago.
When we tested the system, we found essentially no refrigerant remaining.
That told us there was a refrigerant leak somewhere.
Then we considered the other important piece of information:
This air conditioner was installed during the Clinton administration.
Could we keep spending the homeowner’s money figuring out exactly where it leaked?
Sure.
We didn’t think that was the sensible recommendation.
So we stopped troubleshooting, explained what we found, and turned the call into a free replacement estimate.
And this call is a perfect example of why our first questions matter so much.
What is it doing—or not doing?
When did it start?
What changed around that time?
The symptom tells us what’s happening today.
The history tells us how we got here.
Then the measurements tell us what’s actually wrong.
Because the symptom isn’t the diagnosis.