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HOT WATER VALVE
REMOVAL & INSTALLATION
Not all model years and engine applic
ations use hot water valves.
1. Drain the coolant.
2. Disconnect the vacuum hose at the hot water valve by sliding the tab of
the connector past the L-shaped bend in the ac tuator vacuum tube.
Then, slide the hose connector off the tube while continuing to hold the
tab back against the connector end.
3. Disconnect the heater hos es from the valve.
To install: 4. Install the valve with the vacuum actuator faci ng up. The heater hoses
will hold the valve in position.
5. Install the vacuum hose to the actuator.
6. Refill the cooling system. R un the engine long enough to purge any
trapped air, then add more coolant if necessary.
7. Check for leaks.
Fig. 1: Hot water valve loca tion on carbureted V8 engines
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CRUISE CONTROL
CONTROL SWITCHES
REMOVAL & INSTALLATION
RELEASE
SWITCH
1. At the brake switch, remove either the 2 electrical connectors or the
electrical connector and the vacuum hose.
2. Remove the switch from the retainer.
3. Remove the tubular retainer fr om the brake pedal mounting bracket.
To install: 4. Install the tubular retainer to the brake pedal mounting bracket.
5. Press the brake pedal and install the release switch into the retainer until
fully seated in the clips.
6. Connect the wiring and/or vac uum lines. Adjust the switch.
Fig. 1: Cruise control release switches
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Fig. 2: Cruise control release sw itch location; all models similar
ENGAGEMENT SWITCH
The engagement switch cannot be serviced . The complete multi-function lever
(turn signal lever) must be replaced as an assembly.
ADJUSTMENT
1. Depress the brake pedal and check that the release switch is fully seated
in the clips.
2. Slowly pull the brake pedal back to the at-rest position; the switch and
valve assembly will move within the clips to the adjusted position.
3. Measure pedal travel and check s witch engagement. The electric brake
release switch contacts must open at less than 1 inch (25.4 mm) of pedal
travel. The vacuum release should engage between
5/8 and 1 inch (16-
25mm) of pedal travel.
SERVO
REMOVAL & INSTALLATION 1. Disconnect the electrical connecto r and vacuum hoses at the servo.
2. Disconnect the actuating chain, cable or rod from the servo.
3. Remove the screws holding the vac uum servo and solenoid unit to the
bracket, then remove the unit.
To install:
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4. Connect the large diamet
er brake release vacuum line to the servo unit.
Connect the vacuum hose from the va cuum control valve to the servo
unit.
5. Connect the actuating chain, rod or cable to the servo.
6. Install the servo unit to the bracket; tighten the screws to 12 inch lbs. (1.4
Nm).
7. Install the electrical connector to the servo.
8. Adjust the cable, rod or chain.
Fig. 1: Servo mounting on 1982-1984 2.5L engines
Fig. 2: Servo mounting on 1982-1984 carbureted V6 and V8 engines
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ARM
Removal of the wiper arms requires the
use of a special tool, GM J-8966 or its
equivalent. Versions of this tool are gener ally available in auto parts stores.
1. Insert the tool under the wiper a rm and lever the arm off the shaft.
Raising the hood on most later models will facilitate easier wiper arm removal.
2. Disconnect the washer hose from the arm (if so equipped). Remove the
arm.
3. Installation is in the reverse order of removal. Be sure that the motor is in
the park position before installing the arms.
Fig. 4: Wiper arm removal tool
Fig. 5: Use a small prybar or screwdriver to lift the arm locktab
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WASHER FLUID RESERVOIR
REMOVAL & INSTALLATION
1. Drain the reservoir.
2. Disconnect the washer pump elec trical connector, if equipped.
3. Disconnect the hoses.
4. Remove the attaching bolts and remove the reservoir.
5. Installation is the reverse of removal.
Fig. 1: A common washer reservoir location
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members which smoothly bring gear and
shaft to the same speed before the
toothed dog clutches are engaged.
ADJUSTMENT
LINKAGE
4-SPEED TRANSMISSION
All terms used in the following procedure match those which are used in the
accompanying illustration. No linkage adjustment is possible on the 5-speed
transmissions.
1. Disconnect the negative batte ry cable at the battery.
2. Place the shift control lever (F) in Neutral.
3. Raise the vehicle and support it safely with jackstands.
4. Remove the swivel retainers (P) from the levers (E, H, and J).
5. Remove the swivels (S) from the shifter assembly (G), and loosen the
swivel locknuts (R and T).
Fig. 1: 4-speed shift linkage adjustments
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Fig. 1: The torque converter housing is rotated by the engine's crankshaft, and
turns the impeller - The impeller then spin s the turbine, which gives motion to
the turbine shaft, driving the gears
The torus is turning faster than the turbi ne. It picks up fluid at the center of the
converter and, through centrifugal force, slings it outward. Since the outer edge
of the converter moves faster than the portions at the center, the fluid picks up
speed.
The fluid then enters the outer edge of th e turbine blades. It then travels back
toward the center of the converter case along the turbine blades. In impinging
upon the turbine blades, the fluid loses the energy picked up in the torus.
If the fluid was now returned directly into the torus, both halves of the converter
would have to turn at approximately t he same speed at all times, and torque
input and output would both be the same.
In flowing through the torus and turbine, the fluid picks up two types of flow, or
flow in two separate directions. It flow s through the turbine blades, and it spins
with the engine. The stator, whose blades are stationary when the vehicle is
being accelerated at low speeds, converts one type of flow into another. Instead
of allowing the fluid to flow straight back into the torus, the stator's curved
blades turn the fluid almost 90° toward the direction of rotation of the engine.
Thus the fluid does not flow as fast to ward the torus, but is already spinning
when the torus picks it up. This has the effe ct of allowing the torus to turn much
faster than the turbine. This differ ence in speed may be compared to the
difference in speed between the smaller and larger gears in any gear train. The
result is that engine powe r output is higher, and engine torque is multiplied.