Air Conditioning Maintenance Mobile Service Engineer specialising in repair and servicing of vehicle air conditioning covering Shrewsbury, Telford, Shropshire and Mid Wales areas.
AC Mobile repair FGAS 2079 class 1 trained service engineer travels to you to diagnose the fault and fix your car truck or tractor air conditioning system. Car Van Minibus Truck Tractor and Mobile Plant Cab Air Conditioning and Refrigeration.Telephone 01743 884888 www.autoelectrics.net
An Efficient vehicle air conditioning system will reduce high cabin temperature by cooling effect if heater blower fan vent system is set to recirculation mode. Air conditioning reduces cabin compartment air temperature. Cabin air is chilled by heat transfer to produce a cooler climate and fresh, more comfortable environment. If the evaporator fan (blower fan for cabin) is producing warm air from cabin vents then the air conditioning system is likely to need maintenance servicing. If the air conditioning is working properly air from vents will feel icy cold.
Enhance driver and passenger safety by maintaining a comfortable cabin temperature in hot working conditions to reduce risk of heat exhaustion.
Cab temperature control improves working environment for operators of mobile plant increasing comfort and reducing fatigue.
Maintain vision by keeping the windscreen demisted. Some systems can reverse the flow of refrigerant to provide heating as well as cooling.
Filtration of air entering the passenger compartment cab reducing dusts and pollution
Dehumidifying - Drying of the air circulating in the passenger compartment
Enhancement of vehicle security allowing windows to remain closed in hot weather
Supply of air conditioning compressors, switches & components, heaters, heater blower fan motors, repairs to : Vans * HGV Trucks * Minibuses * Coaches * Ambulance * Excavators * Construction equipment * Quarry plant * Agricultural machinery * Marine * Motorhome
Strict Legislation applies to the servicing of Vehicle Mobile Air Conditioning and Refrigeration Systems. See(MAC directive) of EC F-Gas (Fluorinated Gas) Regulations also see http://www.defra.gov.uk/environment/air-atmos/fgas/sectors/mobileaircon.htm for more details.
Persons handling refrigerant have a legal requirement to be F-gas trained and qualified as a refrigerant handler to meet the requirements of 2014 EC regulations and also company registered see Guidance notes
more information about F Gas regulations and guidance is available from Gluckman Consulting see IS6 and IS22. Updated F Gas regulations apply from 1st January 2015 (EU reg 517/2014).
A variety of refrigerants have been used by manufacturers in vehicle mobile air conditioning (MAC) applications with different refrigerant types and systems requiring a variety of service equipment. Refrigerants are compared by Global Warming Potential (GWP). Legislation is aimed at gradual phase out of environmentally damaging refrigerants in favour of low GWP solutions.
R12 is a CFC refrigerant which was used on older vehicles but was banned in the 1990s due to its damaging environmental effects.
R134a is a HFC refrigerant(GWP 1430) and probably the most common refrigerant currently found in air conditioning systems of vehicles sold up to 2017. Only Fgas certified personnel can legally recover R134a from a vehicle air conditioner.Facilities for service and repair of vehicle R134a air conditioning systems on site (where component access allows) include:
Environmental legislation has forced manufacturers of vehicles type approved since 2011, and all new vehicles sold after 1st January 2017 to use low GWP refrigerants below 150. HFO R1234YF refrigerant (GWP 4) which has many environmental and cooling benefits over R134a including a lower GWP rating. Certain manufacturers have raised concerns about the use of 1234yf due to potential flammability.
Vehicle air conditioning systems using R744 Carbon Dioxide (GWP 1) are being developed by certain german manufacturers. R744 is already in use in stationary refrigeration applications and operates at extremely high pressures (up to approx 170 bar). Dry ice can be formed within systems causing blockage. Carbon dioxide leakage in to vehicle interior may be detrimental and cause nausea, to overcome this a Carbon Dioxide sensor is fitted to the vehicle interior.
HFO R452a is a blended (Zeotropic) refrigerant used in Commercial vehicle transport refrigeration systems.
Moisture causes problems with air conditioning system components because;
Air conditioning is a pressurised system. Refrigerant can be lost from the vehicle air conditioning system due to leaking pipework, seals, or components. The condenser can be a common point of failure due to its location at the front of the vehicle and possibility of impact damage.
Symptoms of air conditioning refrigerant loss from a vehicle climate control system may include:
Hissing noise of gas escaping can indicate a refrigerant leak, though most leaks are less obvious. Refrigerant should be recovered from the system as soon as possible for environmental reasons.
Warm air blowing from cabin vents.
Failure of the air condtioning compressor to operate. Low refrigerant pressure sensed by the pressure switch may prevent engagement of the vehicle aircon compressor electric clutch.
Loss of refrigerant can also result in loss of the refrigeration oil which lubricates the air conditioner compressor leading to subsequent failure.
Marginal refrigerant gas loss can occur over time by permeation through hoses. Vehicle manufacturers generally recommend that an automotive air conditioning system has a refrigerant recharge every two years.
Refrigerant recharge involves recovery of any remaining refrigerant from the air conditioning system to minimise environmental damage before any service maintenance work is completed.
Leak detection methods include:
After refrigerant recovery, the air conditioning system is placed under vacuum. During a vacuum hold test the system is locked off whilst under vacuum and monitored for a time period to see if vaccum is lost indicating an air leak nto the system, or potential refrigerant leak. Most automatic refrigerant recovery machines used in garages use this method of leak test before refrigerant recharge is allowed. Refrigerant leaks may not show when the air conditioner system is under vacuum but only show by pressure test.
After refrigerant recovery, the air conditioning system is pressurised with Nitrogen gas. The system is locked off whilst under pressure and monitored for pressure loss over a time period. Loss of pressure indicates a leak.
An electronic device sensitive to refrigerant is used to sense leakage by passing over system components and air vents.
A small quantity of UV dye may be introduced into the vehicle airconditioning system. Should a leak occur, the UV dye will glow when under UV light.
Restricted component access can make leak detection on vehicle air conditioning systems difficult and complex to repair.
The only effective cure for a refrigerant leak is a repair or component renewal.
Vehicle climate control systems can have complex wiring and electronic control which may require computer aided diagnosis to read or clear fault codes which may prevent air conditioning system operation.
A typical electronic climate control system may monitor external ambient and internal cabin vent temperatures, refrigerant pressure and flow, also monitoring and controlling compressor engagement, rotational speed and operation of blower fans.
We welcome enquiries.
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