NOTE: Check with your local authorities before attempting
to service you vehicle's A/C system. In most areas it is illegal to purchase
R-12 or R-134a and service the system unless you are a certified technician.
CAUTION
The compressed refrigerant used in the air conditioning system expands into
the atmosphere at a temperature of −21.7°F (−29.8°C)
or lower. This will freeze any surface, including your eyes, that it contacts.
In addition, R-12 refrigerant decomposes into a poisonous gas in the presence
of a flame. Do not open or disconnect any part of the air conditioning system,
near open flame.
- Avoid contact with a charged refrigeration system, even when working on
another part of the air conditioning system or vehicle. If a heavy tool
comes into contact with a section of copper tubing or a heat exchanger,
it can easily cause the relatively soft material to rupture.
- When it is necessary to apply force to a fitting which contains refrigerant,
as when checking that all system couplings are securely tightened, use a
wrench on both parts of the fitting involved, if possible. This will avoid
putting torque on refrigerant tubing. (It is advisable, when possible, to
use tube or line wrenches when tightening these flare nut fittings.)
- Never start a system without first verifying that both service valves
are backseated, if equipped, and that all fittings are throughout the system
are snugly connected.
- Avoid applying heat to any refrigerant line or storage vessel. Charging
may be aided by using water heated to less than +125°F (+51°C)
to warm the refrigerant container. Never allow a refrigerant storage container
to sit out in the sun, or near any other source of heat, such as a radiator.
- Always wear safety goggles when working on a system to protect the eyes.
If refrigerant contacts the eyes, it is advisable in all cases to see a
physician as soon as possible.
- Frostbite from liquid refrigerant should be treated by first gradually
warming the area with cool water, and then gently applying petroleum jelly.
A physician should be consulted.
- Always keep refrigerant can fittings capped when not in use. Avoid sudden
shock to the can which might occur from dropping it, or from banging a heavy
tool against it. Never carry a can in the passenger compartment of a truck
- Always completely discharge and recover the system before painting the
vehicle (if the paint is to be baked on), or before welding anywhere near
the refrigerant lines.
