Q: I think my AC is broken.

asked by on

I don't know if the compressor is what needs replacing. I was driving the other day with the AC on. I noticed the car was struggling to accelerate and the AC seemed like it was chugging. When I got home, it smelled like something was burning. I took it to get the AC diagnosed and was told that the AC system was on low charge at the time. But I was also told that recharging it wouldn't guarantee that it would be fixed. I was also told the vent temp was 60 degrees, low side pressure was 35psi, and high side pressure was 250psi. Ambient temperature was 85 degrees. I don't know what to do. The belt is fine, and I haven't had this issue before. I am debating whether or not to buy a new compressor, drier pad mount, and expansion valve, and just have it all replaced and recharged. Any suggestions?

My car has 122000 miles.
My car has an automatic transmission.

It is difficult to know what is going on here. Mainly because the A/C system would only cause your car to struggle on acceleration if there were an excess of oil or refrigerant in the system or if the compressor was failing. With what the repair shop has stated, I would think they would have had an idea of what other problems your A/C system has. The pressure readings seem ok except the low side seems a bit high, of course the temperature out the vents does not seem cold enough. This indicates the A/C is working and the blend door is not.

Measuring the temperature of the low side is what I would do next here. Usually simply grabbing a low side line is all I need to do. If the low side is indeed problematic, this would indicate a compressor that isn’t compressing as it should. But I wouldn’t condemn it based on this information.

The blend door is part of the dash and not the A/C system under the hood. This would seem to be the reason they said the A/C may not blow cold. The blend door is part of the temperature control system in the dash panel. This is a separate system from the A/C system under the hood.

The diagnosis of the A/C system requires a number of hands on visual inspections. At the moment, I don’t see enough information to give advise about why your car would be chugging.

If you need some help with this, consider booking an appointment with a certified mechanic to help you more thoroughly diagnose the issue with your A/C.

At the moment I don’t see a connection between your chugging and the A/C system. There could be one, but I just don’t have enough information at this time to give anymore advise.

Thanks for your inquiry.

Good luck!

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I think my AC is broken.

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: My car turns off when the air conditioning comes on - 2013 Nissan Altima

The A/C system depends on the drive or serpentine belts driven by the motor to work. If the A/C is putting extra load on the engine, the engine will suffer and can stall. You will want to start by watching...

Q: Pretty new car that’s now broken

Hello, having a transmission that fails is definitely one of the more costly repairs. The only maintenance that can be done is replacing the transmission fluid and filter. Most people prefer an automatic transmission that has a smooth shift between...

Q: Not sure what part my car needs. It it shakes when I'm getting off the high way. And it feels like it's dancing in the front.

Hello, thank you for writing in. When dealing with a shake or wobble, its always best to start with the simplest options and work your way up in complexity. Make sure your tires are properly inflated, and have the tires...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...