Service

Air-Conditioning Re-gas

Air-con loses ~10% of its refrigerant every year, even when it's not on. A full evacuate-and-recharge takes about 45 minutes and brings cooling back to factory spec.

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By the Surrey Tyres team

Workshop technicians · West Molesey, KT8

·Updated 22 May 2026·5 min read·Air-Conditioning Re-gas

Car air-conditioning has a permeable seal at every fitting in the system. Even with no faults, a typical car loses 10-15% of its refrigerant gas per year by simple molecular escape — by year 3, you're down to two-thirds of factory cooling capacity, and by year 5 you might be running at 40%. The fix is a full evacuate-and-recharge: pull all the old gas and oil out under vacuum, hold the vacuum to confirm no leaks, and refill with the correct weight of fresh refrigerant and PAG oil.

We run a modern AC service station that handles both R134a (used on cars built before 2017) and R1234yf (mandatory on all cars built since). R1234yf is more expensive (about 3× the price per gram) but legally required for newer vehicles. A correct refill weighs the gas to ±5 grams of the door-sticker specification.

Included in every service: leak detection (UV-dye injection if needed), cabin filter inspection (often blocked with leaves/pollen on cars over 3 years old — replace from £19), and a final temperature reading at the dash vent. Target is 8-12°C below ambient. If we can't hit that, there's a fault we need to fix — and we tell you exactly what.

What’s included

R134a & R1234yf
Leak detection included
Cabin filter check
~45 minute service

When you need this

Your air-con doesn't cool as well as it used to
It hasn't been re-gassed in 2+ years
You hear a hissing or gurgling from the dash when you switch it on
Your air-con is unevenly warm-then-cool at the vents
You've bought a car older than 5 years and don't know the service history
Your AC smells musty (cabin filter / evaporator service needed)

How it works

1. Connect AC service station
Recovery hoses to high and low pressure ports on your AC system.
2. Recover existing gas
All old refrigerant captured (legally required — venting to atmosphere is a £1000 fine). Weighed out so we know how depleted you were.
3. Vacuum the system
Pull down to deep vacuum and hold for 15 minutes. Confirms no leaks. If vacuum drops, we trace the leak before recharging.
4. Inject fresh oil and dye (if applicable)
PAG oil for compressor lubrication; UV dye for any future leak tracing.
5. Charge with weighed refrigerant
Exact gram weight from door-sticker specification. Modern systems are precise — over- or under-charge causes faults.
6. Test, temperature reading, deliver
Run the AC at full chill, measure vent temperature. Should be ambient minus 8-12°C. Receipt + warranty.

Air-Conditioning Re-gas prices in Surrey — from

Indicative starting prices fitted and VAT-included. Exact price depends on vehicle, size, and stock — call for a firm quote.

R134a re-gas (pre-2017 vehicles)
From £59
Most cars older than 8 years
R1234yf re-gas (2017+ vehicles)
From £119
Mandatory refrigerant, premium cars
Leak detection (UV dye + check)
From £39
Add-on if your system loses gas quickly
Cabin filter replacement
From £19
Recommended every 2 years or 20,000 miles
Anti-bacterial cabin clean
From £29
For musty/eggy AC odour
Compressor diagnostic
Free
Included free if AC fails to chill after re-gas

Surrey Tyres vs the alternatives

Honest comparison against the chains and pure-mobile outfits. Pick what works for you — but pick with the facts.

Criteria	Surrey Tyres	Chain / alternative
R1234yf machine	Yes — required for 2017+ cars	Many independents R134a only
Exact weight charge	Door-sticker spec ±5g	Visual gauge / approximate
Vacuum hold time	15 minutes — confirms no leak	2-5 minutes — leaks slip through
Includes filter check	Yes — replacement quoted separately	Often missed
Cost	£59-119 honest	£40 budget then "needs more gas" upsell

In Surrey

Local picture

AC servicing peaks May-July. Most KT8 customers come in just before summer with cars 3+ years out of dealer warranty — typical scenario: "AC isn't as cold as it used to be, MOT next week." Re-gas takes 45 minutes; the savings vs dealer (BMW dealer ~£150, vs £119 with us for identical R1234yf work) make it a no-brainer.

Available across Surrey

West Molesey · KT8 East Molesey · KT8 Hampton Court · KT8 Thames Ditton · KT7 Esher · KT10 Walton-on-Thames · KT12 Teddington · TW11 Hampton · TW12 All areas

FAQ

Air-Conditioning Re-gas — your questions, answered

How do I know if I need a re-gas vs a repair?+

Free 15-min diagnostic at our workshop. We connect the AC service station, read pressures, and tell you which it is. If pressures are simply low (90% of cases), a re-gas fixes it. If there's a hard leak or compressor fault, we quote the repair.

How long does a re-gas last?+

A correctly re-gassed system holds gas for 2-3 years before needing topping back up. If yours empties faster, you have a leak — we diagnose and quote separately.

Why is R1234yf so much more expensive than R134a?+

R134a is being phased out globally due to environmental impact (global warming potential 1430× CO2). R1234yf has GWP of just 4. The new gas is patent-protected and harder to manufacture — currently costs roughly 3× per gram. All new cars must use it.

What if I can't remember when it was last serviced?+

Doesn't matter — we read the system pressures and weight the gas we recover. We can tell you exactly how depleted you are. Books are nice; physical measurement is definitive.

Will an AC service improve fuel economy?+

A well-maintained AC uses less engine load than a struggling one. Worn or low AC can cost 3-5% in fuel economy. Not a primary reason to service it, but a useful side benefit.

My AC blows warm — is the compressor dead?+

Not necessarily. Most "warm AC" cases are simply low refrigerant. Compressor failure is the minority case (typically with hard mechanical noise or refusal-to-engage). Diagnose first, replace later.

Tyre brands we fit

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