394 Auto Engine Performance and Driveability
Copyright by Goodheart-Willcox Co., Inc.
Note: If carbon has been released from the
canister, the evaporative emission control
system must be purged before replacing
any component. Remove the carbon by blowing it
out with compressed nitrogen.
Thermostatic Air Cleaner
To replace a thermostatic air cleaner vacuum switch,
fi rst remove the vacuum hoses. Next, pry the clip from the
vacuum fi ttings to release the switch and pull the switch
from the housing, Figure 18-32. Place the new switch and
gasket, if used, in the housing and push the clip over the
vacuum fi ttings. Then, reinstall the vacuum hoses. Check
the thermostatic air cleaner operation.
The thermostatic air cleaner vacuum motor can be
changed without replacing the entire air cleaner assembly.
Place the air cleaner in a bench vise or other holding fi xture
so that the vacuum motor is upright. Remove the vacuum
hose from the motor. Remove the screws holding the vac-
uum motor to the snorkel, Figure 18-33A. If the vacuum
motor is spot-welded or riveted to the snorkel, drill out the
welds or rivets using a small drill bit. Lift the motor from
the air cleaner snorkel. To disengage the linkage from the
vacuum motor to the damper fl ap, slide it to one side of the
fl ap, Figure 18-33B. Install the replacement vacuum motor
in reverse order of removal, using the screws provided to
attach the replacement motor to the snorkel. After installa-
tion, check the thermostatic air cleaner operation.
EFE Valve
To service the early fuel evaporation system, the
engine and exhaust system must be suffi ciently cool. If the
defect is in the valve or diaphragm, the vehicle must be
raised on a lift. Remove the exhaust pipe at the exhaust
manifold and slide the valve and diaphragm assembly off
Figure 18-32. A—Removing the vacuum switch in a thermo-
static air cleaner is a simple operation. Most switches are held
in place by one or two clips or bolts. B—Carefully remove the
switch and replace it with a new one. (Chrysler)
Gasket
Vacuum
switch
B
Retaining clips
Screwdriver
A
Figure 18-33. A—The vacuum motor is held by one or two bolts
or rivets. B—Make sure the link is removed from the fl ap before
removing the motor. (Subaru)
Air control valve
B
Pull
out
Pull out
Vacuum motor
A