Skip the auto shop - Our mechanics make house calls

Q: A/C not cold, diagnostics unclear

asked by on

I have had my 2005 Kia Rio since 2014. The A/C was cold for a short amount of time but has since then been difficult. I've had 3 separate diagnostics on it and so far I haven't gotten any answers. Last summer, I went to the dealership for a diagnosis and they said everything was working "fine", that the A/C was "cold", and that they put in a dye and wanted me to come back in a few days to check for a leak with the dye in place. The A/C never felt cold to me, in fact it was about as warm as the outside temperature, but I did not return to the dealership and spent the summer in the heat. Yesterday, I took my car to another shop for an A/C diagnosis and to have belts replaced (but not the timing belt). The shop said the A/C is blowing "cold" and did not find a leak as well but put in some Freon-- it is not cold, it's just not hot. What could be causing the issue that cannot be seen with diagnostics?

My car has 139000 miles.
My car has an automatic transmission.

A: The first thing that needs to be done is to...

The first thing that needs to be done is to see if the compressor is engaging and if the fans are turning on when the a/c is turned on. The a/c pressures also need to be checked to see if they are where they should be. If there isn’t enough of a pressure differential, the a/c can turn on and operate, but won’t actually blow cold air. This could be caused by a low refrigerant charge, a failing compressor, or a failing expansion valve. I would suggest having a qualified technician, such as one from YourMechanic, diagnose your A/C concern for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Uphill power

As you may have noticed, when the vehicle is in "ECO" mode, there is a significant reduction in power that is intentionally done to reduce emissions into the environment. You can try turning this off and you should notice a...

Q: I have a new battery but my car won't start

The solution will depend on the symptom you are observing as you try to start the car. I recommend a no-start diagnostic which will identify the root cause. There are a lot of possibilities but if the engine does turn...

Q: Air conditioner compressor does not turn on

Hi. If the air conditioner compressor does not turn on, this may perhaps be indicative of a problem with the fuse or relay, or perhaps something more serious, such as a failed compressor. I would recommend having the vehicle's air...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...