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Isuzu Dmax aircon failure (full dash removal!)

Every single 4WD out there has its list of shortcomings, and whether the owner wants to admit it or not, you’ll always be able to find a number of things that should have been done better by the manufacturer.

For the Isuzu Dmax prior to the new shape in 2020, the aircon has a nasty habit of failing, and in a relatively big way.

When we purchased our Dmax, I knew some of the shortcomings, but not the aircon issue, and to be completely honest, ever since finding out about it I’ve been waiting for the day that our Dmax aircon would stop working.

Dmax aircon

I’d been waiting for our aircon to fail

That day happened not so long ago, after a day out with the family. We hopped back in the car and could tell pretty quickly that the aircon wasn’t doing what it was supposed to. I booked it in for a service a day later, and mentioned the aircon, and that it was likely in need of some major attention.

We’ve had our Dmax for about 5 years now, and have done a comprehensive post of all of the Isuzu Dmax Problems, along with a post covering the entire Dmax Build, one that covers the Dmax weights, and another one that covers the Dmax build cost.

What fails on the Dmax aircon?

Put simply, there’s an aircon pipe that runs from the engine bay through the dash and to the evaporator, which vibrates and eventually results in the evaporator cracking, and then the 134A gas required for the aircon cooling leaks out, and your aircon stops being able to produce cold air.

Aircon pipe to the dash

The aircon pipe that goes through the dash causes the evaporator to crack and leak the R134A gas out

This stems from insufficient support, and there are now companies selling brackets that you can install to provide additional support. I’ve also seen a number of people installing P clamps against the firewall to prevent it from moving.

Apparently the new Dmax and BT50’s actually come with a clamp from the factory (2021 models and beyond). I was also told that if you fit an aftermarket unit you’ll likely have no further issues, as they are a different design.

This is a common problem, and I’ve seen a number of people go through 3 or 4 evaporators, with hundreds of posts about it on the Isuzu Facebook groups. If I had to guess, I’d say Isuzu would have replaced more than a thousand of these in Australia by now, if not more.

What does it a new evaporator cost?

To get the evaporator replaced, you are looking at anywhere from $1000 – $2300 including labour, depending on where it gets done, and how much you get ripped off. Isuzu in Bibra Lake quoted $1420 to do the job, including 6 hours of labour, parts and GST.

Does Isuzu warranty cover the work?

If your vehicle is under warranty, you’ll get these jobs covered, which is a good thing as its not cheap. I’ve read a number of people complaining about the dashboards being damaged while the work is being done, which isn’t great, and can create another talking point to your local Isuzu Dealer.

How long is the repair?

Our Isuzu dealer quoted 6 – 7 hours to do the job, as you have to remove the dashboard to get access. Lovely. 

Isuzu dealer or independent mechanic?

For general servicing and fault finding, you’ll probably find most people will recommend an independent mechanic over a dealer. However, we’ve had pretty good service from our Isuzu dealership, and given that they’ve done this very job a number of times, I figured it would be better to get them to do it than an independent mechanic, who may have never done this job before.

That said, I did rear a number of people have done it themselves, or had auto electricians do the job as well. It’s not so much difficult as it is time consuming and fiddly.

Either way, it’s probably a good idea to find someone who’s done this exact job at least once before!

Evaporator pipe going to the firewall

Take it somewhere that has done a few of these before

What if its out of warranty?

Our Dmax is a 2016, and the aircon stopped working in 2022, which means its out of the warranty period. In actual fact, the warranty expired on 06/03/22, and the aircon broke about 60 days later

When I booked it in, I made a point of asking if it would be covered by warranty, and was met with no reply. 

In my opinion, an aircon should last longer than 6 years, and given its a common design flaw by Isuzu, I was prepared to push hard for it. Consumer law states that anything you buy should do what a ‘reasonable person would expect it to do’. I don’t think its reasonable to expect your aircon to break so early on in a new vehicle.

Dmax at Francois Peron

Our Dmax was out of warranty and I was expecting a big fight

Was it covered by warranty?

I’ve had a pretty good relationship with Bibra Lake Isuzu. They’ve done a good job maintaining the vehicle, are generally very helpful and have only had a couple of minor issues (the cleaner knocked our vehicle into 4WD and I didn’t realise, and they messed up a hire car on one occasion). Overall I’m very happy with them, and wouldn’t keep taking my vehicle to them if I wasn’t.

They lodged the warranty claim, and on the day the vehicle was finished I received a call saying that Isuzu had knocked the warranty back. I made a point of asking how many evaporators that Bibra Lake Isuzu had replaced over the years, and if they’d ever done any out of warranty. I was told a lot, and none out of warranty.

I rang Isuzu the next morning, expecting to have a big fight about consumer guarantee, and how I was prepared to take it all the way to the ACCC if needed. Surprisingly, the lady on the other end explained that the dealer has the ability to lodge an after sales adjustment, where they cover the failure in good faith, and that she couldn’t see anything had been lodged.

She explained that she would request it, and I’d be contacted again. A couple of hours later I was told the paperwork was done, and I’d have a decision in 24 hours.

Now, I was prepared to take this all the way as needed, and the outcome would be shared on this very blog regardless, which would not reflect well on Isuzu. As far as I’m concerned its a known, major fault and even if it was well out of warranty a normal person would expect it to last longer, and as such they should fix it regardless.

The short of it, is I got a call back that same day from head office saying its gone through as 100% covered, and I’d receive confirmation shortly. 

The vehicle was picked up with a new evaporator installed, our aircon works and Isuzu covered the replacement (as they should have).

Evaporator pipe

Fortunately the Dmax was still covered

Preventing the aircon failure

If you have a Dmax or MUX and are worried about your evaporator cracking for the first time, or again, there’s a few things you can do to prevent issues.

The first thing that you should know is if you don’t use your vehicle off road extensively the chances of failure are hugely reduced. 

From there, the new evaporators fitted (when they fail) are apparently a different design and your chances of it failing are also reduced (apparently).

However, if you want to do something more substantial, you can fit a P clamp to the firewall to reduce the movement. You can buy kits to do this, or just use a P clamp, but it needs to be done in a way that does not move the pipe at all. If you lean on it, or knock it, or push it the wrong way you can break the evaporator without doing anything further.

I would suggest you take a look at a new model Dmax or BT50 (or some of the Colorado’s) to see how its done on them. We might go down this path; I haven’t decided just yet!

Have you had issues with your Isuzu Dmax or MUX air conditioner evaporator? When did it fail, and was it covered by warranty?

Aircon working again

We have working aircon again!

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26 comments… add one
  • Ray May 16, 2022, 1:37 PM

    Nice write up. We’ve done a heap of Dmaxs along with both our personal and work vehicles. We don’t use the genuine evaporator, we use one from our main supplier that has a different construction. Support for the suction pipe is always a great piece of preventative maintenance.

  • Aaron Schubert May 16, 2022, 1:39 PM

    Hi Ray,

    Thanks for your comment, and interesting about using a different evaporator. I don’t suppose Isuzu are prepared to help out with the cost of these replacements, even if they are under warranty?

    I think I’ll be putting a P clamp on mine!

    All the best

  • Ray May 16, 2022, 3:08 PM

    Like all car brands they want their parts. They will not use aftermarket. We do the work for 2 brands in the area, wad 3 but Holden shut shop.

  • Aaron Schubert May 16, 2022, 3:27 PM

    Thanks for the perspective Ray; always interesting to hear from those actually in the game!

    Sounds like you’ve got a great reputation and business going on!

    Take care

  • Gtrg August 8, 2022, 7:32 PM

    Hi team can some one help me with my 2021 dmax a/ C problem it’s done 20500 KLM the a,C has been faulty from the start it’s been to two Isuzu repairs under warranty one said there was to much gas in it and the other said it had low gas in it did work not bad but now blows hot air how can you help cheers team

  • Aaron Schubert August 8, 2022, 7:44 PM

    Hey Greg,

    I’d suggest you ring Isuzu in their head office, and have a discussion with them. They might agree to getting it looked at by a more competent auto electrician/fridgy

    All the best

  • Phil September 4, 2022, 8:41 PM

    Thanks for the info. My 2015 dmax has just had aircon issues pop up. I got it regassed the other day and it worked on and off for a bit and now seems to be not working. I’m thinking it may be the same problem.

  • Aaron Schubert September 5, 2022, 5:17 AM

    Hey Phil,

    Yep, more than likely it is. The dealerships put something else in to test it, rather than risk the gas leaking out.

    Hopefully you get it resolved without too many issues; make it clear that this is a known issue

    All the best

  • Ray Devenish October 18, 2022, 10:52 AM

    Yep, just had my aircon give up last Saturday. Still have 6 days of warranty left. Been ringing service department at Midland for two days now and can’t get through. I will keep on trying. If all else fails I rock up in person on Saturday. They have to take my call then.

  • Aaron Schubert October 18, 2022, 11:58 AM

    Hey Ray,

    Sorry to hear mate; its frustrating and not much fun. Hopefully they sort you out with no issues.

    All the best

  • Theodoor Beeltje November 21, 2022, 3:14 PM

    Covid stopped my plans for going off road in my MY18 D-max in ’20, which may have saved the AC I guess. retiring in 6 months and expect to start travelling soon after. However, I can’t find any specific info on an after market evaporator pipe bracket, or how to fit a P-clamp. Can you point me to something instructive in this area?

  • Erin Briggs November 22, 2022, 4:13 PM

    My 2016 dmax aircon has just had the same problem. Going into Isuzu tomorrow to get it fixed. Mine is also out of warranty but I have asked if they can cover it under warranty. Like you said it’s a common problem. Didn’t take them long to figure out what the problem was which makes me think they see this a lot. Hopefully it will be covered by warranty.

  • Aaron Schubert November 24, 2022, 1:24 PM

    Hey Theo

    If you jump on Facebook, and search through the Dmax and MUX pages, you’ll see a number of photos of people who’ve literally purchased a 30 cent P clamp from Bunnings and screwed it into the firewall. This would need to be done very carefully or you could induce other stresses, but I did also see a kit someone was selling that had instructions and looked a bit better.

    I’ll be honest though and say we haven’t done ours yet, even though I really should!

    All the best

  • Aaron Schubert November 24, 2022, 1:31 PM

    Hey Erin,

    Hopefully they sort it out for you with little inconvenience. It’s certainly well known, and I doubt there are any dealers who’d disagree.

    Let us know how you get on!

  • Peter January 3, 2023, 4:35 AM

    Thanks for the info .. the aircon on my 16 Dmax stopped working on New Year’s Day 2023 .. heading to Dealer asap thanks so much for posting this helpful advice.

  • Aaron Schubert January 3, 2023, 3:46 PM

    Hey Peter,

    You’re welcome! There’s never a convenient time! All the best with a fix


  • Douglas Sharp January 4, 2023, 8:37 AM

    Hi, I believe I have this problem with my 2015 Holden Colorado7. Just been quoted $2100 to repair. Not very happy. Have you heard anything about the same problem with the colorado7’s?

  • Aaron Schubert January 5, 2023, 2:21 PM

    Hey Douglas,

    Sorry to hear mate. I haven’t actually heard anything about it crossing over to the Colorado range, but it could be possible for sure.

    I’d get an aftermarket one fitted if you can; apparently they are better than the genuine ones (or at least in the case of Isuzu)

    All the best

  • Tony January 11, 2023, 12:13 PM

    Same issue on my 2018 D-Max in December. Vehicle out of KM warranty but Isuzu approved the warranty claim.
    New evaporator being fitted today as we speak.
    It’s always when you really need it in Summer in Queensland, it’s going to fail….

  • Nick January 11, 2023, 5:41 PM

    Thanks for your write-up. My evaporator went just befor xmas. I’ve been quoted $1,400 for the fix. Pity I didn’t do a bit more research before buyung my 2016 4×2 Dmax. Bought it third-hand at 120k on the clock. Most I’ve ever paid for a car by a long shot, so I’m disappointed at this extra cost. The cost os one thing. I’m worried that the extensive dismantling will result in a reassembly that is not quite right. Even someone who has done one of these previously would risk having a couple of screws leftover at the end. There are a couple of Youtube vids that show the whole gruesome process. I’d happily pull a motor down before I’d tackle a modern dashboard. What twisted mind designs these things. I like the vehicle otherwise, so I’ll pay up I suppose. Hope it’s not a case of good money after bad!

  • Aaron Schubert January 11, 2023, 6:02 PM

    Hey Tony,

    Good to hear it was still covered. There’s no good time to lose aircon though, and murphy’s law says it fails when you need it most!

    All the best

  • Aaron Schubert January 11, 2023, 6:04 PM

    Hey Nick,

    I would push hard with Isuzu, and see where you get. You really have nothing to lose, but its a known fault and frankly a design flaw. I would say its not fit for purpose, and see what they say. You can speak directly to Isuzu Australia if you have no luck with a dealer.

    When you seen how fast the guys pull a modern dash apart, its pretty interesting, and I suspect you’ll be just fine.

    Overall the Dmax’s are pretty solid, and hopefully you’ll have a great run going forward

    All the best

  • Kevin Rankin January 17, 2023, 10:07 AM

    My 2017/bought 2018 June LSU D-Max is to go in to Trinity Autos Cairns on Friday 20-01-23 so thanks for the information and I’m expecting a warranty to be paid by Isuzu,it has been gassed my an auto electrician with dye running though it and lasted less than 24 hours.So having the dye in the gas will make it easier for Isuzu to pick up the fault,he said show them the receipt he wrote out for me and will let you know the result.No off road and 41,000 Km.

  • Aaron Schubert January 17, 2023, 5:20 PM

    Hey Kevin,

    Good to hear you are getting it sorted. It’s still a pain in the backside though, and 41k with no off-road work is shocking.

    All the best

  • Ian foley March 27, 2023, 11:33 PM

    Hi, my name is ian, I bought a second hand 2018 isuzu dmax april last year (2022). I to had the same problem, air con stopped getting cold, I took it to a local auto electrician, he regassed it as it was low on gas he said. One week later when I went to use the air-conditioning, nothing but hot air. I took it back to the same local auto electrician, he had the car for the day, rang me and said air conditioner had issues. I told him not to go any further as I would get isuzu in keysbourgh to take a look, sure enough, a leak under the dash, $1500 roughly to replace, no warranty. On my behalf, keysbourgh isuzu submitted paperwork to whomever, same day, isuzu rang me and said they would cover it under warranty, that was a huge relief. It goes in on Wednesday 29.03.2023, they said they’ll need the car for 2 days. I’ve had 3 dmax’s now and 1 mux, never had issues with any of them, this is the first major problem I’ve ever had. I drive them with respect, Isuzu are the best in my eyes, I don’t do off road ever, they just tow my caravan with eze. I’m 70 y/o. Go your own way👍.
    Thankyou. Ian Foley.

  • Aaron Schubert March 28, 2023, 5:45 AM

    Hey Ian,

    Good to hear you are happy with the vehicles, and that Isuzu are covering the aircon under warranty.

    Cheers and all the best

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