Dodge R1500 1999 Service Manual page 121

panel assembly.
6) Connect vacuum source probe to each port of connector. See
Fig. 1. Record each vacuum gauge reading. Vacuum reading should be 8
in. Hg at each port.
NOTE: Brown (bi-level) vacuum circuit contains a restriction in
line. It takes longer to obtain correct vacuum reading on
this line.
7) If correct vacuum readings are obtained, replace faulty
A/C-heater control panel vacuum switch assembly. If proper vacuum
readings are not obtained, check appropriate vacuum circuit.
8) Start vacuum check by plugging vacuum hose at vacuum
actuator in suspect circuit. Recheck vacuum circuit by connecting
vacuum source probe to proper port.
9) If proper vacuum reading is now obtained, replace vacuum
actuator. If proper reading is not obtained, check vacuum hoses and
connections for leak. Repair or replace as required.
Fig. 1: Testing A/C-Heater System Vacuum Control Circuits
Courtesy of Chrysler Corp.
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