Choosing a garage for AC work is where a lot of drivers get stuck. Not because the job is complicated, but because there is a real difference between garages that do AC work properly and garages that just top up the gas and send you on your way. Knowing what a proper car air con regas should involve makes it much easier to judge whether you are getting a thorough job or a shortcut.
This guide walks through exactly what to expect from start to finish; how long the job takes; what the technician is actually doing; and how to tell whether the garage you are using is doing it right. If you are in South London and looking for somewhere straightforward and reliable, Pit-Air Motors on Purley Way in Croydon covers all of this and more.
What a Proper Regas Appointment Looks Like
The first thing to know is that a well-run garage will not just hook up a machine and fill up the gas. That approach, sometimes called a “top-up,” is actually a shortcut that causes problems further down the line. Topping up without extracting the old refrigerant first means you have no idea what condition the system is in; whether moisture has entered; or whether a slow leak is present.
A proper regas follows a specific sequence. Here is what that looks like step by step at Pit-Air Motors.
1: System connection and refrigerant recovery
The technician connects specialist recovery equipment to the AC service ports. The machine draws out all remaining refrigerant; weighs it; and stores it safely. Nothing is vented to the atmosphere, which is both a legal requirement and a quality indicator.
2: Vacuum test
With the system empty, a vacuum is applied and held for several minutes. This removes moisture from the loop and; critically; acts as a leak check. A system that holds a vacuum is clean and sealed. One that loses vacuum has a leak somewhere, which needs attention before the regas continues.
3: Refrigerant charge
Fresh refrigerant is available; check into the system to the manufacturer’s exact specification for that vehicle, measured by weight, not guessed. The correct amount of compressor lubricant is added at this stage too.
4: Performance check
The system is run and vent temperatures are measured. Pressures on the high and low sides are confirmed against the vehicle’s spec. The car does not leave until the technician is satisfied the system is performing correctly.
The whole process takes around 45 minutes on a standard vehicle. Same-day appointments are available; which means the car does not need to be left overnight for a routine regas.
How Long the Job Takes and What Affects It
Most standard regas jobs are completed within 45 minutes to an hour. That covers the full process: recovery; vacuum; recharge; and performance check. If you arrive for a morning appointment, the car is typically ready before lunch.
A couple of things can extend the time. If the vacuum test reveals a leak, the technician needs to identify the source before proceeding. Minor leaks from seals or fittings can sometimes be addressed quickly, but a significant hose fault or component leak will require a separate repair. In that case, you are always informed of what was found and what the options are before any extra work begins.
Vehicles using R1234yf refrigerant, the newer type found in most cars built after 2017, take slightly longer on the recovery step because the equipment handles this gas differently. The overall time difference is small, typically fifteen to twenty minutes extra at most.
Pricing: What Affects the Cost
AC recharge pricing varies between garages and between vehicles for a few specific reasons. Understanding those reasons helps avoid surprises.
Beyond the refrigerant type, pricing should be transparent before any work starts. At Pit-Air Motors, the cost is confirmed when you call or book online. What is quoted is what you pay, with no additions unless something is found during the vacuum test that requires a separate repair, and that is always discussed with you first.
Something Worth Noting
Be cautious of very cheap fixed-price AC deals from fast-fit chains. Some of these operations skip the vacuum test entirely and simply top up the gas. The job is quicker, which is how the price is kept low, but moisture stays in the system, and any existing leak remains undetected. You will be back within a few months wondering why the AC is not working again.
Independent Garage or Dealership: Does It Matter?
For AC work, an independent garage with the right equipment and qualified technicians is every bit as capable as a dealership, often more so because AC is a core part of their business rather than a side service.
“A dealership charges dealership prices for everything. An independent specialist charges for the work. On a routine regas, the job is identical. The difference is the invoice at the end.”
What actually matters is whether the garage holds F-Gas certification; which is a legal requirement in the UK for any business that handles refrigerant gases. A certified garage is qualified to handle both R134a and R1234yf; uses calibrated equipment; and follows the correct procedure. Any reputable garage will confirm this if asked.
Pit-Air Motors operates with fully qualified technicians and handles all vehicle types, including electric and hybrid vehicles, which have their own considerations when it comes to AC work. The team works on everything from compact city cars to commercial vans, so the range of vehicles that come through is broad.
What to Tell the Garage When You Book
You do not need to know your refrigerant type or have any technical knowledge before booking. The garage looks up all of that. What does help is giving a brief description of the symptoms you have noticed: whether the cooling feels weaker than it used to; whether there are any smells; whether demisting has slowed down; or whether you simply have not had the system touched in several years and want it checked.
Mentioning the vehicle’s age and mileage is also useful, as is noting if the car has ever had AC work done elsewhere. If a previous repair was carried out at another garage and the problem has returned, that is worth flagging so the technician can check whether the earlier work was done correctly.
For most people, the booking conversation is simple. You call and say you need a car air conditioning regas; give the vehicle details; and pick a time. That is genuinely all there is to it.
Frequently Asked Questions
Do I need to book in advance, or can I just turn up?
Pit-Air Motors recommends calling ahead to confirm availability rather than just turning up, especially during summer when demand for AC work increases. Same-day appointments are usually available if you call in the morning, but booking a day or two ahead means you can choose your preferred time rather than fitting around what is left.
Will the technician check for leaks even if I have not mentioned one?
Yes. The vacuum test is part of the standard process, not an optional extra. Every regas at Pit-Air Motors includes this step, which is how leaks are identified before the new refrigerant goes in. If a leak is found, you are told before any further work proceeds.
Can Pit-Air Motors service the AC on my electric or hybrid vehicle?
Yes. Electric and hybrid vehicles are handled at Pit-Air Motors. The AC systems on EVs and hybrids use the same refrigerant types as petrol and diesel cars, but the overall vehicle architecture requires additional care from technicians who understand how these systems interact with the high-voltage components. The team at Pit-Air has experience with both.
What if the recharge does not fix my AC problem?
If a regas is completed and the system still does not perform correctly, the technician will investigate further. In some cases a fault is identified during the regas process itself before the new refrigerant goes in. In others it becomes apparent during the post-charge performance check. Either way, you leave knowing what the car needs, not guessing.
Book Your Regas at Pit-Air Motors
520B Purley Way, Croydon CR0 4RE. Same-day appointments available. All makes; models; and fuel types welcome.