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HOMESERVICE MANUALSCHRYSLER1993LEBARON LANDAUREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM TROUBLE SHOOTING - MANUALVACUUM CONTROL SYSTEM DIAGNOSISVACUUM CONTROL ONE-WAY CHECK VALVE
1993 Chrysler LeBaron Landau

Vacuum Control One-Way Check Valve

1993 Chrysler LeBaron LandauSECTION Vacuum Control One-Way Check Valve
NOTE: Some models use brake booster check valve for vacuum source. These models do not use another in-line vacuum check valve.
  1. In engine compartment, locate Black vacuum hose that runs from brake booster check valve or intake manifold vacuum source, through firewall near heater hoses or expansion valve. This supply vacuum hose goes to A/C-heater control panel vacuum switch.
  2. Within Black vacuum hose, disconnect and remove check valve near intake manifold or brake booster.
  3. Connect Vacuum Test Gauge (C-3707) to an external vacuum pump. Start vacuum pump. Plug end of hose probe on vacuum test gauge. Adjust bleed valve on vacuum test gauge to obtain an EXACT vacuum reading of 8 in. Hg.
  4. Unplug and plug end of hose probe on vacuum test gauge several times to ensure exact vacuum reading.
  5. Connect vacuum test gauge hose probe to control panel side of check valve. Vacuum test gauge reading should be 8 in. Hg. Replace check valve if vacuum leak exists.
  6. Connect vacuum test gauge hose probe to engine side of check valve. Vacuum should flow through check valve. Replace check valve if not as described.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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