"You will have to read the conditions of your warranty very carefully to find out exactly what is included and what isn't." Complete rubbish Galaxy.

The rest of your post makes more sense.

OP. You are covered by SOGA. That's all you need. Write to the dealer, demanding that the problem(s) be rectified within 7 days, giving a specific date. Mention that you will approach Trading Standards if not resolved by then.

The wording of any 3 month warranty is not worth a light. Your legal rights will exceed anything therein. Tear it up! And I ran a warranty company for 6 years so take my word.

No idea why people are mentioning Trading Standards. They are not concerned with nor responsible for a civil matter between two parties. Unless the car is unroadworthy or clocked they won't be in the remotest bit interested beyond giving you a leaflet.

If you do decide to persue it under the SoGA you will have to go to court. Be warned this will take 6-8 months and you'll need good documentary evidence. To be honest, on a 6 year old car, non-working aircon would be a tough one to win. It doesn't make the car unfit for purpose as a car.

From "Ask HJ" and the FAQs

During the first 6 months

The consumer returns the goods in the first six months from the date of sale and requests a repair or replacement or a partial refund. In that case, the consumer does not have to prove the goods were faulty at the time of sale. It is assumed that they were. If the retailer does not agree, it is for the retailer to prove that the goods were satisfactory at the time of sale. This comes from Sale and Supply of Goods to Consumers Regulations 2002, derived from EU Directive 1999/44/EU which became Clauses 48A to 48F inclusive of the Sale of Goods act in April 2003

The problem is that the above is written for a new products. Delve into the details and you'll find there is a new v used clause which basically says that a product at 40% of new cost only needs to be 40% as good as a new one. That is what leaves a massive black hole of no one really knowing where they stand because each case is judged by its merits. In other words what is "satisfactory" on a 6 year old car is different to a 6 month one but what is "satisfactory" no one actually knows.

Anyway, as I wrote above, ultimately you have to go to court to prove it. This is currently taking 6-8 months, costs about £500 minimum up front and involves a lot of time and work.

In practice, on used cars, the SoGA is no where near as useful as people think.

Thank you guys, you've been very helpful. I'll take it back on Saturday and see what they say.