Skip the auto shop - Our mechanics make house calls

Q: How long can I postpone replacing leaking A/C compressor

asked by on

My A/C compressor is leaking and mechanics suggested for compressor and kit replacement. I dont have money right now and want to replace it wither by myself or after august, 2016 so that I can save some money. my question is: 1. how long can i keep driving my car without replacing the bad parts and not using the a/c and just opening the window? 2. if I want to do it myself, along with the compressor, what other accessory items should i replace to keep the whole a/c system in good condition. i have ordered hynes repir manual for my hyundai santa fe 2002 model.
My car has an automatic transmission.

A: There really is not a time limit. Once most...

There really is not a time limit. Once most of the refrigerant has leaked out of the system, the compressor will not turn on. There is nothing you can do to turn the compressor on from inside the car. At this point, no real harm is being done. Here are some things that do harm the system:

  • (1) The worst thing you can do is to keep adding refrigerant to keep the system working. There is oil inside the system. It leaks out along with the refrigerant.

  • (2) Moisture also harms the system. When it mixes with refrigerant, it becomes acidic and corrodes the system from the inside out. It also does not lubricate. When you open the system to replace parts, it’s imperative to put it into a deep vacuum to remove all the air and moisture before charging. This requires a deep vacuum pump.

  • (3) Debris. The compressor is basically a small 6 cylinder piston engine. There are not any filters in the AC system. It should be flushed every time a major component is replaced. Debris from an old compressor can ruin a new one very quickly.

  • (4) Running the system low on refrigerant. Since you know you have a leak and are going to have it fixed, I would have the system evacuated until it is repaired. This assures the compressor will not turn on. Liquid refrigerant is what circulates the oil in the system. When there is very little of it, then very little oil, if any, will circulate.

The kit your mechanic mentioned, contains all the parts that should be replaced. The compressor, the desiccant bag, the expansion valve, and O-rings. The desiccant bag is a sock full of pellets that absorb moisture. Once they are saturated, it becomes useless and needs replaced. It is located inside the condenser. The condenser usually needs to be removed to replace the desiccant.

The expansion valve is the only other part of the system that has moving parts. It regulates the flow and pressure to maintain the proper temperature of the evaporator. O-rings are the seals where two parts meet. The system will need to be flushed. You can buy AC flush solvent by the quart. I have found it best to pour it into sections of the system, one at a time. Then blow it out with compressed air.

I usually don’t recommend servicing your own AC system, but if you are pretty handy, have the proper hand tools, have a manual, and can rent or borrow the special tools you need, it can be done properly. However, the best way to save money with AC repairs is to repair it correctly the first time.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: I replaced the fuel pump on my 2010hyundai accent it came on for a second then nothing. What could be the problem?

Hello, thank you for writing in. The first thing you can do is turn the key to the "On" position, and listen for the fuel pump to prime. If you hear this buzzing sound coming from the tank, you know...

Q: If I go through a puddle, even one that is not deep, my engine stalls out. Mechanic told me to avoid puddles.

Hi, thanks for writing in. A lot time when this happens, it is due to a bad belt, or the belt is being soiled by oil and fluid from the car. The belt tensioner also could be weak, allowing the...

Q: Jerking/studdering problem

Hi, thanks for writing in. This is a common sign of a failing mass air flow sensor. This is a unit that regulates the air flow into the engine as it is mixed with fuel prior to being injected into...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.