My daughter got bitten in exactly the same way.

Really sorry bring it in and well sort it. Yes they sorted it by re-gassing. A few months down the line (when your rights are eroded) it fails again. Diagnosis was a hole in the condensor which it would have had a time of purchase.

Expensive to repair and for me if its fitted it should work even for the sake of when it comes to a private re sale. you could loose a sale or have to offer a suitable discount when by rights the expense should have been shouldered at purchase time. And a tidy profit will have been made at that time as well.

A three year old car should not need a regas unless there is an issue,

I have current/very recent experience of successfully rejecting a 2016 Baleno and of failure of its air-con system (that wasn't what I rejected it for). I'll post more about it shortly because I think it could be useful to others.

There is stuff you need to know and do now before the 30 day time limit expires.

These are useful: government-approved guidance to car dealers about their responsibilities and consumer rights - www.businesscompanion.info/sites/default/files/Car...f and a Financial Ombudsman newsletter about problems with car finance - www.financial-ombudsman.org.uk/files/2914/79.pdf

I think in a previous post you mentioned that the car was to be bought on finance. If so, and if it's HP or PCP, the critical points is that legally it was the finance company that supplied the car, not the car dealer (see both linked publications). The finance company has the obligations to the consumer, the dealer has none. You have no contract with the dealer. The FO says that some finance companies will wrongly try to push customers back to the dealer.

The test under the Consumer Rights Act 2015 is whether the car is of 'satisfactory quality' taking into account age, etc. - the 'satisfactory quality' that a reasonable person would expect. I would suggest that non-working a/c (for whatever reason) is clearly not satisfactory quality.

I would suggest that:

1. You do not take the car back to the dealer for them to 'have a look at'. The dealer is a third party and this may complicate and delay things.

2. Immediately contact the finance company by phone, e-mail and 'real' letter saying that the a/c is not working and the car is not of satisfactory quality. Say that you wish to exercise your rights under CRA 2015. If it's within 30 days of the contract date say that you reject the car. Give them a time (say 7 days) in which to respond. (Be prepared to encounter delay, obfuscation, and obduration).

3. Start and maintain a log of all contact with the finance company - times/dates/content of phone calls etc. This can be invaluable.

In relation to the a/c on my Baleno, I took it to a local specialist who tested and regassed it. They introduced a UV dye, and when I took it back for follow-up a week later found a leaking condenser. They said it was probably corrosion, apparently a known fault. I took it to my local Suzuki dealer. Quote £550, not covered by Suzuki Used Approved Warranty. Still within 6 months since acquisition so I put in a complaint to the finance company under CRA (they get one go at repairing it) but this was (and has proved to be) academic because I was already quite far along in the (finally successful) rejection battle.

And yes, the Baleno uses the newer more expensive and troublesome a/c gas.

Hope this is of some help.