FAQ

Frequently Asked Questions.

Straight answers about vehicle servicing and air conditioning from the ACR-100 workshop.

Air Conditioning

Air Conditioning questions

  • How often should I re-gas my car's air conditioning?

    Every 2 years as a rule of thumb. Refrigerant slowly permeates through hoses and seals — around 10–15% per year — so even a leak-free system will eventually blow warm. If yours has never been done, it's overdue.

  • What's the difference between R134a and R1234yf?

    R134a is fitted to most vehicles built before 2017. R1234yf replaced it on newer cars because it has a far lower global-warming impact, but it is mildly flammable and much more expensive. The two gases are NOT interchangeable — using the wrong one damages the system and voids warranties. We stock and handle both, plus R744 (CO₂).

  • My air con blows cold at first then goes warm — what's wrong?

    Usually a slow refrigerant leak, a failing expansion valve, or a compressor clutch dropping out when pressures climb. It can also be a blocked cabin filter or a condenser packed with debris. A nitrogen pressure test and dye check pinpoints the cause before we recharge.

  • Why do you pressure-test with nitrogen instead of just refilling?

    Nitrogen is dry and inert, so we can safely pressurise an empty system to hunt for leaks without wasting refrigerant or contaminating the circuit with moisture. Recharging a leaking system just vents expensive gas into the atmosphere within weeks.

  • Does running the air con use more fuel?

    A little — typically 3–8% depending on load. A healthy, correctly charged system uses far less than one that's overworking with low gas or a seized compressor clutch. Running it briefly year-round actually keeps seals lubricated and prevents leaks.

  • Do you work on vans, HGVs and 4x4s?

    Yes. We service air conditioning on cars, vans, pickups, 4x4s and HGVs. Give us a call with your vehicle details and refrigerant type and we'll confirm.

Servicing

Servicing questions

  • How often should my car be serviced?

    Most manufacturers recommend a full service every 12 months or 12,000 miles, whichever comes first, with an interim oil-and-filter service at 6 months / 6,000 miles for high-mileage drivers. Follow the service book for warranty vehicles.

  • What's included in a full service?

    Engine oil and filter change, air and pollen filter inspection or replacement, brake inspection, suspension and steering check, all fluid top-ups, battery test, tyre condition and pressures, lights, wipers and a full underbody visual inspection.

  • What's the difference between a service and an MOT?

    An MOT is a legal safety check that confirms your car meets minimum standards on the day of the test. A service is a thorough maintenance routine that changes fluids, filters and wearable parts to keep the car reliable, efficient and running smoothly between MOTs. We carry out services and repairs; we do not offer MOT testing.

  • Will servicing my car with you affect the manufacturer warranty?

    No. Under EU Block Exemption rules you can have your car serviced anywhere, as long as the correct grade of parts and fluids are used and the service book is stamped. We use OE-quality parts and record everything.

  • How long does a service take?

    An interim service is usually 60–90 minutes; a full service takes 2–3 hours. We'll always give you an accurate estimate when you book and call before starting any additional work.

  • Can you diagnose warning lights on the dashboard?

    Yes. We plug into the vehicle's OBD system to read live data and stored fault codes, then use our workshop experience to identify the root cause rather than just clearing the light. You get an honest quote before any repair goes ahead.

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