BMW Air Conditioning Regas Service in Walsall
This black BMW came into us at Platinum Vehicle Services blowing hot air from the air conditioning. The owner had noticed it over a period of time, the air just was not getting cold anymore, and by the time it arrived with us it was putting out nothing useful at all on a warm day. That is a common pattern with air conditioning systems. They do not usually fail overnight. The refrigerant level drops gradually, performance gets worse, and then one day it simply stops working. We got it booked in, carried out a full inspection of the system, and then carried out a complete air conditioning regas service to bring it back to where it should be.
The System Had Lost Refrigerant and Was No Longer Able to Cool the Air
The first thing we do before any regas is put the system through a vacuum process. We connected our PRO series air conditioning service machine to the BMW using the blue and red hoses you can see in the video, one to the low pressure side and one to the high pressure side of the system. The machine pulled the system down to a vacuum of -0.95 bar and held it there for just over twenty minutes. The reason we do this is twofold. First, it removes any moisture that has found its way into the system. Moisture in an air conditioning circuit reacts with the refrigerant to form acids, and those acids will corrode the internal components over time, including the compressor, which is the most expensive part in the system. Second, holding a vacuum lets us see whether the system holds pressure. If the vacuum drops during that period, it tells us there is a leak somewhere before we put any refrigerant in. There is no point filling a leaking system. You would be wasting gas and the customer would be back within weeks with the same problem.
Once the vacuum held, we moved on to the oil and dye injection stage. The oil lubricates the compressor and the other moving parts within the circuit. Without it, the compressor runs dry and will eventually seize. The dye is a UV-reactive fluid that we inject so that if there is any slow leak present, it shows up clearly under a UV lamp during the flush test at the end of the job. This BMW uses R134a refrigerant, which is the standard refrigerant for vehicles of this age. There is a label under the bonnet, fitted by the manufacturer, which specifies R134a and gives the exact fill weight as 550 grams, with a tolerance of plus or minus 10 grams. We follow that specification precisely. Overfilling an air conditioning system causes excessive pressure and can damage the compressor. Underfilling it means it will not reach the correct operating temperature. Neither outcome is acceptable, so we charge to the manufacturer figure every time.
Leaving It Any Longer Would Have Risked Compressor Damage and a Much Larger Bill
When an air conditioning system runs low on refrigerant, the compressor is not just working less effectively, it is working under strain. The refrigerant in these systems also carries the lubrication oil around the circuit. When refrigerant levels are low, there is less oil circulating, and the compressor starts running with reduced lubrication. Over time, that causes wear on the internal components. A compressor on a BMW of this type can cost several hundred pounds to supply and fit, sometimes significantly more depending on the model. The regas itself is a fraction of that cost. So if your air conditioning is blowing warm or just not as cold as it used to be, getting it looked at sooner rather than later is always the more cost-effective decision. Waiting until it stops completely can mean the compressor has already been working dry for some time, and by then you may be looking at a more involved repair.
Full Regas Completed with 550 Grams of R134a, Oil and Dye Injected, and a Flush Test Carried Out
After the vacuum held and the oil and dye were injected, we recharged the system with 550 grams of R134a refrigerant to the manufacturer specification. Once the charge was complete, we carried out the flush test. This involves running the system and checking all the connection points and components under a UV lamp to confirm there are no leaks and that the dye we injected is circulating properly. The BMW passed the flush test without any issues. The air conditioning was blowing cold air correctly before the car left us, and the owner was satisfied with the result. The whole process, from vacuum through to final check, is done properly and in the right order every time. There are no shortcuts that are worth taking on a pressurised system like this.
Air conditioning is something a lot of drivers do not think about until it stops working, but it is worth having the system checked and regassed roughly every two years as a matter of course. The refrigerant does seep out slowly even on a system with no faults, and keeping the levels right protects the compressor and keeps everything working as it should. If your air conditioning is blowing warm air, taking longer than it used to get cold, or making an unusual noise when you switch it on, those are the signs to watch for. Any of those things is worth getting looked at before the problem develops further.
We carry out air conditioning regas and inspection services here in Walsall for all makes and models. If your car's air conditioning is not performing the way it should, get in touch and we will book it in. You can reach us and find out more about what we do at platinumvehicleservices.co.uk.
