Frequently asked questions




Why do i need to have my A/C system serviced ? 
Al lvehicle air conditioning systems will leak to some degree. The losses occur
through refrigerant escaping through the pipe joints as a result of vibration and
the ageing of rubber hoses and '0' ring seals, as' well as'through the seal on the
front of the compressor shaft.

How often should the A/C system be serviced ? 
Every12months should be sufficient.WE can provide a comprehensive list of all checks carried out and produce a report on the condition of the system. 

Why does my fridge at home not need servicing every twelve months ?  

A domestic fridge has no rubber pipes and no seal on the 'front of the compressor
shaft; all piping is copper therefore there is no Ieaking through pipewalls.

Is it true that the A/C system should be run often throughout the year ?
Yes, this helps to keep the system well lubricated and leak tight.

Why ? 

Because the refrigerant actually carries the oil that lubricates the system, most
importantly the compressor, it also keeps the seals and hoses moist, thus
preventing them from drying out and cracking leading to leaks. 


Why is looking after the compressor so critical ?

This is the main component in the A/C system, replacements typically,cost £250-£500, plus labour costs to remove and replace. Also it usually follows that a
seized compressor will result in other components getting damaged in the

What`s involved in a service ? 

We measure the pressures in the system, check quality of refrigerant present and
check all functions. Then we recover the refrigerant and vacuum the system down
to a very low pressure to remove any moisture that might be present. We then
Re-Charge (Re-Gas) with refrigerant and replace any lubricant that was recovered
with the refrigerant.

Why can`t i service the system myself ? 

This is difficult not only because specialist equipment is needed but most
importantly the refrigerant present in the system must be recovered. It is
ILLEGALto vent the refrigerant into the environment. The system is also under
high pressure and needs pulling into a deep vacuum to remove any moisture. The
refrigerants themselves have a very low boiling point and willcause freeze burns
if they come into contact with skin or eye tissue.

Why put ultra violet (uv) dye in the system ? 

The UVdye shows up under a bright UVlight source, so any leaks present in the
system can be easily identified either during fault finding, or if future leaks were
to develop.

Why use nitrogen for leak testing ? 

We use Oxygen Free Nitrogen (OFN)for leak testing. It would be illegal to re-gas
a system to use the refrigerant as a means of leak detection. The pure form of
Nitrogen is a naturally occurring gas in the air that we breathe and so is safe and
legal to use. The Nitrogen is inserted into the system under high pressure thus
simulating a system in operation and revealing any leaks in the system

Why should my gas be analysed ? 

Our gas analyser can reveal whether or not your gas is the correct type for your
vehicle air-con system and whether or not it is contaminated which would
strongly suggest a leak in the system. The wrong type of refrigerant could also
bring about the premature failure of the compressor, as it may not be able to
carry the essential lubrication around the system.

Important information

It has been known for systems to be Re-Charged using Hydrocarbon based
refrigerants e.g. propane or methane mixtures. This means you could be driving
around with a potentially lethal mix of gases In your system that In the event of
an accident/collisioncould.leadto the riskofan explosion. .

If you suspect your system may have been recharged with
such a mixture, why not have US run a check for you?