A/C Service Equipment History
Refrigerants, recovery machines, vacuum pumps and EPA Section 609 milestones.
Why did compressor clutch tools become common?
Short answer: A/C compressor clutches are pressed or bolted onto the compressor shaft.
A/C compressor clutches are pressed or bolted onto the compressor shaft. As clutch replacement on the vehicle became common, shops adopted clutch puller and installer kits for different compressor designs.
Why did spring lock coupling tools appear in A/C service?
Short answer: Ford used spring-lock couplings on A/C and fuel lines on many vehicles in the late twentieth century.
Ford used spring-lock couplings on A/C and fuel lines on many vehicles in the late twentieth century. Special release tools were needed to separate these couplings without damage. Technicians are trained to treat this work with caution.
Why did A/C service port adapters appear?
Short answer: The R-134a transition introduced quick-connect service ports that differed from R-12 threaded ports.
The R-134a transition introduced quick-connect service ports that differed from R-12 threaded ports. Adapters and retrofit fittings helped shops service different systems.
Why were cars retrofitted from R-12 to R-134a?
Short answer: R-12 production was phased out in developed countries under the Montreal Protocol, ending in the United States by 1996.
R-12 production was phased out in developed countries under the Montreal Protocol, ending in the United States by 1996. Owners of older R-12 cars often retrofitted them to R-134a, which required changing service fittings, labeling and often oil.
Why did A/C system labels become important?
Short answer: Labels identify refrigerant type and charge amount.
Labels identify refrigerant type and charge amount. They became important during refrigerant transitions to prevent mixing and contamination of R-12, R-134a and later R-1234yf. Shop safety rules apply whenever this equipment is used.
Why did refrigerant recovery become mandatory?
Short answer: Venting refrigerant into the air damages the ozone layer and contributes to climate change.
Venting refrigerant into the air damages the ozone layer and contributes to climate change. The Clean Air Act Amendments of 1990 led to rules requiring recovery and recycling equipment for motor vehicle air conditioning service. Follow the manufacturer's safety instructions when using this equipment.
How did A/C service machines evolve?
Short answer: Early A/C service used simple gauges and refrigerant cans.
Early A/C service used simple gauges and refrigerant cans. Modern machines automate recovery, recycling, vacuum and recharge with programmed charge amounts. Follow the manufacturer's safety instructions when using this equipment.
When did Packard introduce automotive air conditioning?
Short answer: Packard is widely credited with offering one of the first factory air conditioning options around 1940.
Packard is widely credited with offering one of the first factory air conditioning options around 1940. The early systems were bulky, expensive and had limited controls, so few were sold before World War II interrupted car production.
Why did early car air conditioning take up trunk space?
Short answer: Early automotive A/C systems placed the evaporator and blower in the trunk and ducted cold air forward.
Early automotive A/C systems placed the evaporator and blower in the trunk and ducted cold air forward. The setup took up luggage space and was hard to control, and later designs moved components to the front of the car.
When did air conditioning become common on American cars?
Short answer: Air conditioning became increasingly common on American cars in the 1960s and 1970s as costs fell and integrated dashboard systems improved.
Air conditioning became increasingly common on American cars in the 1960s and 1970s as costs fell and integrated dashboard systems improved. By the late twentieth century it was standard or nearly standard on most new vehicles.
How did aftermarket hang-on A/C units fit into automotive history?
Short answer: Before factory A/C was common, dealers and shops installed aftermarket under-dash units that hung below the instrument panel.
Before factory A/C was common, dealers and shops installed aftermarket under-dash units that hung below the instrument panel. They brought cooling to many cars in the mid-twentieth century and created early demand for A/C service skills.
What role did the Montreal Protocol play in automotive A/C service?
Short answer: The Montreal Protocol, agreed in 1987, phased out ozone-depleting substances including the CFC refrigerant R-12.
The Montreal Protocol, agreed in 1987, phased out ozone-depleting substances including the CFC refrigerant R-12. The phaseout drove the automotive industry's move to R-134a and transformed A/C service equipment and training. Wear eye protection and follow the manufacturer's procedures.
Why did R-12 become expensive in the 1990s?
Short answer: As R-12 production ended in developed countries under the Montreal Protocol, remaining supplies became scarce.
As R-12 production ended in developed countries under the Montreal Protocol, remaining supplies became scarce. Taxes on ozone-depleting chemicals in the United States also increased costs, encouraging retrofits to R-134a.
Why did R-134a systems require different compressor oils?
Short answer: R-134a does not mix well with the mineral oil used in R-12 systems.
R-134a does not mix well with the mineral oil used in R-12 systems. Synthetic PAG and ester oils were adopted for R-134a, and technicians had to learn which oil each system required.
Why did refrigerant identifiers become shop equipment?
Short answer: After the R-12 phaseout, some vehicles were charged with contaminated or substitute refrigerants.
After the R-12 phaseout, some vehicles were charged with contaminated or substitute refrigerants. Refrigerant identifiers came into use so shops could test a system before recovery and avoid contaminating their equipment and supply. Technicians are trained to treat this work with caution.
General guidance only. Follow the vehicle and tool manufacturer's procedures, and confirm vehicle coverage on the tool maker's list before buying.