6-6
Chapter 6
- Service Tools & Their Use
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Table of Contents-
IndexSCHRADER TYPE VALVE
VALVE
MANIFOLD GAUGE SET
HOSE CONNECTOR
PIN IN CONNECTOR FORCES VALVE OPEN
AC SYSTEM PORT
BACK SEAT TYPE SERVICE VALVES
SERVICE PORT TO
GAUGE SET
VALVE IN MID-SEATED POSITION
FOR SYSTEM SERVICE
TURN CLOCKWISE TO CLOSE (FRONTSEAT)
TO ISOLATE THE COMPRESSOR
TURN COUNTER CLOCKWISE TO OPEN
(BACKSEAT) FOR AC SYSTEM OPERATION
5. System Service Valves (R-134a only)
New and unique service hose fittings have been specified for R-134a
systems. Their purpose is to avoid cross-mixing of refrigerants and lubri-
cants with R-12-based systems. The service ports on the system are quick
disconnect type with no external threads. They do contain a Schrader type
valve as shown in figure 6-5. The low side fitting has a smaller diameter
than the high-side attachment.
QUICK CONNECT HOSE END FITTING
WITH INTEGRAL SHUTOFF VALVE
SERVICE HOSE CONNECTION
DEPRESSOR PIN
SYSTEM SERVICE PORT
VALVE ASSEMBLED TO SERVICE PORT WITH VALVE IN THE OPEN POSITION
Figure 6-4
The valve drawings are
cutaway. The Schrader
valve in the upper portion of
the illustration (like a tire
air valve) is either closed or
open. The three illustrations
below show and describe
stem type valve positions.
Figure 6-5
This illustration shows
R-134a service ports and
hose end fittings.