Grand Marquis V8-302 5.0L VIN F TBI (1984)
Vacuum Reservoir HVAC: Description and Operation
Fig. 28 Vacuum reservoirs
The vacuum reservoir, Fig. 28, acts as an accumulator and prevents sudden drops or rapid fluctuations in a vacuum signal during acceleration. If
vacuum in the reservoir leaks more than 1/2 inch Hg in 1 minute, the reservoir is defective and must be replaced.
