Dodge R1500 1999 Service Manual page 161

VALVES. Connect 2 hoses with shutoff valves to manifold gauge set
center port. Connect one hose to vacuum pump and other hose to
refrigerant container. Weight of refrigerant container before and
after charging can be used to determine amount of refrigerant drawn
into system. Using vacuum pump, purge air from center hoses.
3) Fully open manifold gauge set low-side valve and
refrigerant container valve to allow refrigerant to enter A/C system.
When no more refrigerant is being drawn into A/C system, start engine
and allow to idle. Select MAX A/C, set blower motor speed to maximum
and allow remaining refrigerant to be drawn into A/C system.
NOTE: When ambient air temperature is high, it may be necessary to
use an external cooling fan to blow air through condenser and
radiator.
4) When proper amount of refrigerant has been added, close
refrigerant container valve. Allow any refrigerant remaining in hose
to be drawn into A/C system. When low-side pressure decreases to about
£
30 psi (2.1 kg/cm
A/C system is operating properly. Disconnect manifold gauge set.
Install service port caps. Check system for leaks. See LEAK TESTING.
GENERAL MOTORS
Manufacturer recommends using A/C Refrigerant Recovery,
Recycling And Recharging (ACR4) System (J-39500). The ACR4 system has
one filtering cycle during recovery plus an automatic multiple pass
filtering during evacuation cycle. Follow manufacturer's instructions
provided with ACR4 equipment being used.
JEEP
Connect recovery/recycling equipment, meeting SAE standard
J1991 or J2210, to vehicle. Charge A/C system to specifications, using
equipment manufacturer's instructions.
LEAK TESTING
TYPES OF LEAK DETECTORS
Bubble Solution Detector
This is a solution applied externally at suspected leak
points. Leaking refrigerant will cause the detector to form bubbles
and foam. A soap and water solution also works well.
Dye Solution
This is a colored solution that may be introduced into the
A/C system. The dye will show up and color components at leak points.
Some manufacturers offer refrigerant containing a Red dye. This dye-
containing refrigerant is installed by normal charging procedures.
Other dye solutions are visible with a Black light only.
Electronic Leak Detector
This instrument will draw in any leaking refrigerant through
a test probe, and then sound an audible signal or create a flashing
light if refrigerant is found. It is the most sensitive of the leak
detectors used. Leak detectors are sensitive to windshield washing
solutions, many solvents and cleaners, and some adhesives. Ensure
surfaces near test areas are clean and dry to prevent false signal or
detector damage. Liquids ingested into detector will damage detector.
See Fig. 24.
), close center valve on manifold gauge set. Ensure