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Troubleshoot Automatic Climate Control System Today's automatic climate control systems allow hands-free temperature regulator, whether hot or cold. Once you set a temperature on your car's automatic climate control system, it should maintain that temperature regardless of what's going on outside. HOW AUTOMATIC CLIMATE CONTROL DIFFERS FROM MANUAL AIR CONDITIONING Manual air conditioning systems are just what the name implies: they require he A/C temperature settings to be adjusted manually. Manual A/C systems have an on-off switch, a temperature control knob or slide switch and a knob or switch for adjusting fan speed. With a manual A/C system, you turn on the A/C when you want cool air and select a temperature setting and blower speed. If the air gets too cold, you turn down the blower speed or change the position of the temperature setting. If the air isn't cold enough, you crank it all the way up. The temperature slide switch on most manual systems is ...

MACS Recommended Service Procedures  MACS Recommended Service Procedures © MACSW December 2005 1 of 23 Revision December 2005 MACS Recommended Service Procedures Initial Customer Contact It is important to obtain information from the customer identifying the problem and any previous servicing history prior to attempting repair of the system. • Use of the MACS “Air Conditioning & Heater Customer Questionnaire” will help identify the problem. • Identify service activity on MACS “A/C – Heating – Ventilation – Cooling System Checklist.” Identification of Type of Service Mobile A/C systems are an integral part of the total vehicle and operation of engine cooling fan(s) and the A/C compressor can be controlled by the vehicles’ computer systems resulting in a direct effect on system operation. Cooling Operation • Lack of cooling can be due to many reasons including: o Compressor operation o System Refrigerant Charge and Type ƒ Contaminated refrigerant ƒ Air in system ƒ Too much ...

Air Conditioning Best Service Practices Tried & Tested When your car or truck has an air conditioning problem and needs service, what should you do? If your A/C system only needs some refrigerant, you can probably recharge the a/c system yourself. But if you are having cooling problems, leaks or electronic control problems, you should probably seek out a repair facility that specializes in air conditioning service work. Our advice is to seek out a repair facility that is a member of MACS, the Mobile Air Conditioning Society. MACS is a non-profit trade association for repair shops that do air conditioning service work. MACS promotes training, education, professionalism, and most importantly "Best Practices" for servicing and repairing your vehicle's air conditioning system. Since 1991, MACS has assisted more than one million technicians to comply with 1990 Clean Air Act requirements for certification in refrigerant recovery and recycling to protect the...

R-12 to R-134A Refrigerant Retrofit If you drive an older vehicle (pre-1994), the air conditioning system contains R-12 refrigerant (Freon). As long as the A/C system has no leaks and it cooling normally, there is no need to convert from R-12 to the new "ozone safe" R-134a refrigerant. But if your A/C system has lost it's charge because of a leak, collision damage, or the need to open it to replace a compressor, hose or other component, you may have to convert from R-12 to R-134a when you recharge the system Why? Because R-12 is no longer produced in the U.S. Supplies of recycled R-12 still exist, and some R-12 is still brought in from offshore suppliers. But it is hard to find and expensive. That's why many people simply recharge their older R-12 air conditioning system with R-134a after repairs have been made. R-134a Retrofit Conversion Costs Does it make economic sense to retrofit an older vehicle to R-134a if the A/C system has lost its refrigerant ...

New Automotive Refrigerants For Your Vehicle What the future holds for automotive refrigerants is uncertain, but changes are happening and more changes are coming. R-134a refrigerant contineus to be used in many late model vehicles, but many new cars are now being equipped with A/C systems that use R-1234yf refrigerant. Other refrigerants may also be coming as R-134 is gradually phased out in the years ahead. The Europeans want to phase out R-134a in all new vehicles by 2017. The European rules require any new refrigerants must have a global warming potential of less than 150. The U.S. EPA also wants car makers to switch to a different refrigerant to lower the overall carbon emissions of the vehicle fleet. Carbon credits will be given to auto makers who make the switch to a refrigerant that has a lower Global Warming Potential (GWP). Though R-134a poses no danger to the ozone layer if it escapes into the atmosphere, it is a "greenhouse gas" with a fairly high ...