80 Quattro L5-2309cc 2.3L SOHC (NG) (1988)
Vacuum Reservoir HVAC: Testing and Inspection
Vacuum Reservoir
The reservoir is located in the rear of the left front wheelhouse behind the wheelhouse liner.
1. Remove the left front wheelhouse liner.
2. Remove the vacuum hose from the reservoir.
3. Connect vacuum pump to vacuum hose.
4. Apply 300 mbar (8.8 Hg) vacuum to the system.
5. Reading should not drop more than 10% in two minutes.
If system will not maintain vacuum, check vacuum hoses and components for leaks and repair or replace as necessary.