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Adding Refrigerant to the Air-Conditioning System | Up
Construction Mechanic Advanced - Construction methods and practices | Next
Other Refrigerants |
Table 13-1.—Temperature pressure relationship
8. Close the low-side manifold valve and the
table 13-1. If the vehicle you are working on is
refrigerant can valve.
equipped with a sight glass(fig. 13-4), the bubbles
9. Continue to stabilize the system, and check for
normal refrigerant charge.
FUNCTIONAL TESTING OF THE
AIR-CONDITIONING SYSTEM
Functional testing is required to establish the
condition of all components in the system. The
engine must be running and the air-conditioning
system operating when performing this test. After
the initial charge of refrigerant is installed into the
system, watch the manifold gauge set. Correct
pressure should be 15 to 30 psi for the low side and
175 to 195 psi for the high side. Evaluate the
reading you receive against the standard chart in
should disappear at the correct pressures. Close the
low side gauge manifold set hand valve. Check the
temperature of the air exiting the cooling duct. It
should be close to 40°F with the blower running on
low speed. Stop the engine and disconnect the
gauge manifold set.
As you probably know, the refrigerant R-12 is no
longer considered environmentally safe to use. As
R-12 is being phased out, the new refrigerant R-134A
is being brought on line, but not without a few
problems.
Using anew refrigerant that works under higher
pressure means changes in some of the components
used with automotive air-conditioning systems. Some
of the tools will no longer work with the new
13-21
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