DIY Automotive A/C Repair: Is It Worth It?

[Deadwood]

I've seen a few posts here lately about diagnosing and fixing automotive A/C, and my interest is piqued. I have a 2012 Nissan Altima 2.5 S, and the A/C is out; the clutch is blowing the fuse. Shops here want to charge me between $1,600 and $1,800 to evacuate the system, replace the compressor, pull a vacuum, leak-check, recharge, etc. The compressor clutch is bad. The need to replace the compressor is presumed by both the shops and me, since it's the original OEM unit. A clutch kit would probably just band-aid it for a while. The shops and I agree on this approach.

I have a brief automotive background from the distant past, and I do all my own automotive work otherwise as I am very mechanically oriented, but I never got into A/C back then or since. Is this an area where I can do sufficient online training and certification, rent equipment, and do it myself? I'm mostly concerned about specialized equipment costs, especially buying it. I'm not opposed to buying equipment, but I'm not sure it makes sense either. It really depends on the price point and how much I would use it.

I'm eager to get this A/C working again, but not at the shop's stated price. The "good news" is that I have another car where the A/C isn't working optimally, and I'd like to be able to fix that too—on my time and on my budget. So this is a situation where I could get some good practice and probably justify the cost of the equipment...I think.

For those who have gone the DIY route on automotive A/C, please tell me your story about how you got into it and acquired the knowledge, certification, experience, and equipment necessary to do the work.

 

[danstraylee]

If you have the tools then it's a very simple job. I personally let a reputable shop do it just due to the cost of specialty tools. Just replacing the Desiccant filter is a big deal these days. R-1234yf purge and charge machine are well north of $7,000.00.

When we were using R-134a and R-12 it was simple and tools were cheap. The new R-1234yf is highly combustible (although high flashpoint). If you notice under the hood of a modern vehicle anything near an AC lines are wrapped with Modelitrics to prevent refrigerant from igniting in case of leaks.

 

[oil pan 4]

Well yeah $1600. How many days pay is that? And it will take an afternoon to fix....

 

[danstraylee]

Well yeah $1600. How many days pay is that? And it will take an afternoon to fix....

And that is a very fair price for the work done.

 

[oil pan 4]

And that is a very fair price for the work done.

I started doing all my own hvac because of "fair pricing" like that, the wait times and being blown off.
All the days I didn't waste for the A/C guy to never show up easily paid for all my tools.

 

[shortyb]

Going through something kind of similar on my son's car right now. As ambient temps get hotter, it blows coolish air vs. cold air when ambients are lower. Local VW specialist shop (indie and much less expensive than the dealer) has surmised the compressor is bad from past experiences. I asked about the control solenoid in the compressor, which I have read over and over is usually the priciple cause of a lacking system when it gets hot outside. They said only full replacement of the compressor and not just the solenoid could be done at their shop. They gave me a price for a compressor swap without warranty for $1100. Said if I wanted a warranty, I would need to replace the entire system (compressor, condenser, receiver/drier, expansion valve) and have the system flushed, then recharged. For $2500 .

Decided to read up on things and watch several more trusted YT sites and learn about A/C. Bought a decent set of gauges and a vacuum pump. Hooked everything up and did my own pressure measurements and diagnostics. System is sufficiently charged but found that, indeed, the compressor solenoid control valve is more than likely the primary culprit. Decided to tackle the system replacement myself, but have only purchased the parts so far. New compressor, condenser (with receiver drier), expansion valve, and all gaskets has come to a little over $550 so far. Found another shop that will evacuate the refrigerant, and then recharge the system when I finish, for $150. I feel comfortable doing the replacement myself, especially with the removal of all the front end bodywork to replace the condenser. We'll see how it all goes.

 

[SC Maintenance]

This is how I started. I suggest reading through this thread - we covered a lot.

I have since fixed 2 more.

Thread 'Automotive AC troubleshooting 101 - help me get started?'

May 17, 2025

So while I understand the parts of an Automotive AC system quite well, I have no real practical experience because I haven't had many problems. My Xterra AC quite working one day - more or less overnight my daughter tells me ?

Put a cheap refill gauge on it and the system is empty it appears.

Is my first step to pull a vacuum on it and hopefully find / hear something?

Or do I pull a vacuum, fill it with refrigerant and die, and hope I can see it?

Suggestions on a guage set and vacuum pump? Is the Harbor Freight stuff acceptable, or the cheap stuff on Amazon, or should I look...

• SC Maintenance
• Replies: 123
• Forum: Mechanical/Maintenance Forum

• 

 

[Sam_Julier]

If you have the tools then it's a very simple job. I personally let a reputable shop do it just due to the cost of specialty tools. Just replacing the Desiccant filter is a big deal these days. R-1234yf purge and charge machine are well north of $7,000.00.

When we were using R-134a and R-12 it was simple and tools were cheap. The new R-1234yf is highly combustible (although high flashpoint). If you notice under the hood of a modern vehicle anything near an AC lines are wrapped with Modelitrics to prevent refrigerant from igniting in case of leaks.

Did you mean Armaflex?

 

[Deadwood]

If you have the tools then it's a very simple job. I personally let a reputable shop do it just due to the cost of specialty tools. Just replacing the Desiccant filter is a big deal these days. R-1234yf purge and charge machine are well north of $7,000.00.

When we were using R-134a and R-12 it was simple and tools were cheap. The new R-1234yf is highly combustible (although high flashpoint). If you notice under the hood of a modern vehicle anything near an AC lines are wrapped with Modelitrics to prevent refrigerant from igniting in case of leaks.

I appreciate the heads up on the equipment cost for the newer refrigerant. Thankfully I'm dealing with r134A here

 

[oil pan 4]

Going through something kind of similar on my son's car right now. As ambient temps get hotter, it blows coolish air vs. cold air when ambients are lower. Local VW specialist shop (indie and much less expensive than the dealer) has surmised the compressor is bad from past experiences. I asked about the control solenoid in the compressor, which I have read over and over is usually the priciple cause of a lacking system when it gets hot outside. They said only full replacement of the compressor and not just the solenoid could be done at their shop. They gave me a price for a compressor swap without warranty for $1100. Said if I wanted a warranty, I would need to replace the entire system (compressor, condenser, receiver/drier, expansion valve) and have the system flushed, then recharged. For $2500 .

Decided to read up on things and watch several more trusted YT sites and learn about AC. Bought a decent set of gauges and a vacuum pump. Hooked everything up and did my own pressure measurements and diagnostics. System is sufficiently charged but found that, indeed, the compressor solenoid control valve is more than likely the primary culprit. Decided to tackle the system replacement myself, but have only purchased the parts so far. New compressor, condenser (with receiver drier), expansion valve, and all gaskets has come to a little over $550 so far. Found another shop that will evacuate the refrigerant, and then recharge the system when I finish, for $150. I feel comfortable doing the replacement myself, especially with the removal of all the front end bodywork and all to replace the condenser. We'll see how it all goes.

Good example of why I stay away from VWs.
I evacuate my own systems with my zero dollar rig. Its an empty r134a can, service head and a tumbler full of ice water. Oh and a sock.
I have a post on here about it my $0 refrigerant recovery system.
Since r134a is like $10 for 12oz my motivational price point for refrigerant recovery was virtually nonexistent.

 

[JD!]

I did my first A/C job, a compressor replacement, a few months ago. I just used the loaner gauges and vacuum pump they allow you to buy and return for a full refund w/in 90 days at AutoZone; those work fine for DIY jobs. Considering I spent a total of $75 for the compressor, refrigerant, and oil, I was pretty happy with the money I saved and experience I gained.

Overall, it's pretty intuitive. I was intimidated by A/C work prior to this, but after watching a YouTube video I got the picture pretty quickly. Just have to be precise when weighing out the refrigerant you put into the system.

 

[Nukeman7]

If your facts are correct in that the A/C clutch is causing the fuse to blow, there is zero reason to breach the pressurized system or replace the compressor. You can just change out the clutch for ~$50 in parts and an hour of your labor. I replaced the clutch in my neighbor's 2013 Nissan Pathfinder last summer in 30 minutes; however, your Altima's clutch has a tamper-proof center bolt that will require a bit of additional work to remove as shown at the beginning of the video below. Since the clutch is already bad, you don't need to be concerned with damaging or destroying the bolt head with the grinder (or Dremel tool) since all parts will be replaced.

FYI, installing the A/C clutch kit is not a "band aid" approach to your situation. It is akin to replacing a worn out clutch/pressure plate with a new clutch kit, as opposed to installing a complete new transmission.

 

[danstraylee]

I started doing all my own hvac because of "fair pricing" like that, the wait times and being blown off.
All the days I didn't waste for the A/C guy to never show up easily paid for all my tools.

Then you must be doing something wrong. Why so negative and what was your attitude toward the technicians where they are no shows? I make a call from home and get our HVAC guy out the same day. Last visit 5 years ago was just a recharge. Vehicles I make an appointment and there is no "blowing me off".

Typically Home and vehicle AC systems are good for years to decades after a repair. And replacing a factory OEM compressor being included in the cost is a winner for under $1,800.00.

Said if I wanted a warranty, I would need to replace the entire system (compressor, condenser, receiver/drier, expansion valve) and have the system flushed, then recharged. For $2500 .

You will find out soon enough if you made the right decision. Any microscopic bit of contamination will quickly destroy your whole AC system. If it is an older (over 10 year old) vehicle I highly recumbent replacing all of the above if you want your system to last.

Did you mean Armaflex?

No that is for the AC suction line. Modacrylic wrap and similar are used on components that cause heat and anywhere the flashpoint of R-1234yf is a common issue (at connection points mostly). Alternatives are also used such as Aramid polymers.

​

 

[D60]

I've seen a few posts here lately about diagnosing and fixing automotive A/C, and my interest is piqued. I have a 2012 Nissan Altima 2.5 S, and the A/C is out; the clutch is blowing the fuse. Shops here want to charge me between $1,600 and $1,800 to evacuate the system, replace the compressor, pull a vacuum, leak-check, recharge, etc. The compressor clutch is bad. The need to replace the compressor is presumed by both the shops and me, since it's the original OEM unit. A clutch kit would probably just band-aid it for a while. The shops and I agree on this approach.

Anecdotally, I was just faced with a clutch that was simply NOT engaging on a '14 Rogue Select (old body style).

I removed .036" of shims leaving only .009" but it still wouldn't engage (zero shim caused it to drag). Jumpering directly with my Power Probe netted NOTHING. Trying to knock it in under power = NOTHING.

The woman's on a budget and going through chemo, so for giggles I tried to find just the clutch. I was pretty sure I didn't want to try to pull the clutch in the chassis, but was still curious (not like that one-time-in-college curious).

RA showed nothing. O'Reilly showed a clutch a la carte at over $700 on the commercial site (didn't check retail site).

Bottom line, the safer bet anyway (as a shop) is a new compressor for $250. IOW, path of least resistance

edit: Nukeman can find clutches more better than me!

 

[shortyb]

You will find out soon enough if you made the right decision. Any microscopic bit of contamination will quickly destroy your whole AC system. If it is an older (over 10 year old) vehicle I highly recumbent replacing all of the above if you want your system to last.

And is the exact reason I wasn't going to just have them replace the compressor. Plus, whenever the system is opened and exposed to air, the desiccant (receiver/drier unit) should be replaced anyway. Not doing that at the very least made me second guess having them do a compressor swap.

This is why I have decided to DIY the work and replace all the listed parts along with flushing the lines. Just want a shop with a recovery machine to do the initial evac (not saving the refrigerant), and I can recharge it myself.

 

[The Critic]

And is the exact reason I wasn't going to just have them replace the compressor. Plus, whenever the system is opened and exposed to air, the desiccant (receiver/drier unit) should be replaced anyway. Not doing that at the very least made me second guess having them do a compressor swap.

This is why I have decided to DIY the work and replace all the listed parts along with flushing the lines. Just want a shop with a recovery machine to do the initial evac (not saving the refrigerant), and I can recharge it myself.

If there’s no contamination, it isn’t always necessary to replace all of the parts.

 

[SC Maintenance]

If there’s no contamination, it isn’t always necessary to replace all of the parts.

Yes, I agree with this - for whatever thats worth.

It sounds like your system has maintained pressure. Really shouldn't be a need to replace much other than what's not working honestly.

 

[D60]

If there’s no contamination, it isn’t always necessary to replace all of the parts.

I wonder in particular about the drier. The air is so dry here right now.....is "being open to atmosphere" really going to introduce anything that a good pull down with a vac pump doesn't get out?

Google claims the humidity for my town right now is 14%.

 

[SC Maintenance]

I wonder in particular about the drier. The air is so dry here right now.....is "being open to atmosphere" really going to introduce anything that a good pull down with a vac pump doesn't get out?

Google claims the humidity for my town right now is 14%.

I have read the desicant gets used up even as the system is operating as normal - from the oil itself or something. So I think its likely a good idea to replace the drier any time the system is evaced just as a good practice because its somewhat of a consumable. That is at least how it seems to me.

Most of these old systems the drier is separate and only a few bucks. If it was a big problem or project then I would be more inclined to leave it if the system had not previously had a leak.

 

[wtd]

I'm a DIY'er who learned how to do Auto AC work back in 2006. A friend of mine had given me a 92 Chevy Cavalier with a blown engine. I had another friend install a junkyard engine in it to get it running. The AC of course didn't work. Right after this car was done, someone local was selling a wrecked 92 Cavalier that was still drivable and it only had 76,000 miles on it. I bought it, had the unibody straightened and put a new front end on it and started driving it. The AC still worked in it even though it had been wrecked in the front end from the side.

My fiancé wanted to drive the other one since we both worked at the same place but different shifts and had about a 30-mile drive commute but wanted the AC fixed. Several local shops wanted over $1K to get the AC going again and the car probably wasn't worth much more than that.

She told me that if I would learn how to fix it, she would buy all of the equipment. I bought a gauge set, vacuum pump, can taps, and various other AC tools. I went to several Automotive AC forums on the internet and bought a couple of AC manuals and studied them. The forums I went to had actual AC repair guys on them and would answer any questions you had. I also ended up getting my 609 certificate through MACS. I later bought a refrigerant scale and several 30 lb. tanks of R134a because I was tired of messing with the small cans and it was hard to get an accurate amount of refrigerant into the system. Doing that was a real game changer and made things so much easier. Someone later sold me an almost full 50 lb. tank of R12 for the Cavalier that I drove because it still had the original refrigerant in it.

I successfully fixed the AC in her car and converted it to R134a. That repair lasted about 10 years until the compressor started leaking. I later fixed my two 98 Chevy trucks and other systems in family and friends' vehicles. I've repaired around 25 vehicles since 2006.

It has been well worth it to me to be able to diagnose and fix AC systems. I have saved myself a ton of money and other people as well and learned something in the process.