Nissan Micra AC Regas: Why a Completely Empty Refrigerant System Left This Car Blowing Warm Air
A bright blue Nissan Micra came into us here at Platinum Vehicle Services with one complaint: the air conditioning was blowing nothing but warm air. The driver had noticed it getting progressively worse and decided to get it looked at before the warmer months arrived. It is a common enough problem, and one we deal with regularly at our garage in Walsall, but what we found when we connected the machine told us more than just a simple low charge situation.
What we found on inspection
When we hooked the car up to our Pro AC re-gas machine using the red and blue service hoses, the first reading the display gave us was zero grams of recovered refrigerant. That told us straight away that the system was completely empty. There was nothing left in there at all. A system running with no refrigerant simply cannot produce cold air, no matter how the car's controls are set. The machine then ran a 25-minute vacuum on the system to clear it out and check it was holding before we moved on to the recharge stage.
Why the system empties out and what happens if you leave it
Air conditioning systems are not fully sealed in the way most people assume. Over time, small amounts of refrigerant can escape through microscopic permeation in the hoses and seals. This is a gradual process and entirely normal, which is why most manufacturers recommend a regas every two to three years. However, if the system has been left without attention for long enough, or if there is a more significant leak somewhere, the charge level can drop all the way to nothing, as it had on this Micra. Running an AC compressor with no refrigerant and no lubrication causes wear on the internal components. Left long enough, that wear can turn a simple regas job into a much more expensive compressor replacement. Getting it sorted early is always the better option.
What we did to put it right
Once the vacuum stage was complete and we were satisfied the system was holding, we charged it with 450 grams of refrigerant along with 5ml of PAG oil to lubricate the compressor correctly. We also introduced UV dye into the system during the process, which allows us to trace any future leaks quickly and accurately under UV light if the customer ever comes back with a recurring problem. Once the charge was complete, the difference was immediate. The vents were pushing out nice cold air, exactly as they should be. The customer left with a fully functioning air conditioning system, ready for whatever the weather brings.
If your car's air conditioning has been blowing warm air, or you have noticed it is not as cold as it used to be, that is usually the first sign that the refrigerant level is getting low. You might also notice an unusual smell from the vents, or the system struggling to keep the cabin cool even on a mild day. If any of that sounds familiar, bring your vehicle into Platinum Vehicle Services in Walsall. We cover customers right across the West Midlands and we will get your AC back to working order without any fuss.
