Chevrolet 1977 light duty truck, Руководство по обслуживанию

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3. To install, reverse Steps 1 and 2 above.
BLOWER M O T O R RESISTO R
T he blower motor resistor is located in the blower
side o f the blow er-evaporator case (fig. IB-43).
Replacement
1. Disconnect the w iring harness at the resistor.
2. Rem ove the resistor to case attaching screws and
remove the resistor.
3. Place the new resistor in position and install the
attaching screws.
4. Connect the resistor w iring harness.
BLOW ER M O T O R RELAY
T h e blower motor relay is located on the blower side
o f the blow er-evaporator case.
Replacement
1. Disconnect the w iring harness at the relay.
2. Rem ove the relay to case attaching screws and
rem ove the relay.
3. Place the new relay in position and drive the
m o u n tin g screws.
4. Connect the relay w iring harness.
T H E R M O S T A T IC S W ITC H
The therm ostatic switch is m ounted on the bracket
w hich supports the inlet tube in position at the
e v a p o ra to r case. T he switch sensing capillary is attached
by means o f a clam p to the ev a p o ra to r inlet tube.
Removal
Fig. IB -4 3 -R e sisto r, Relay and T herm ostatic Switch
(C-K Models)
1. Remove electrical connectors to the switch.
2. Remove screws to loosen body fro m evap o rato r
case.
3. A capillary line (small tube) extends from the
swtich with the other end attached to the e v ap o rato r inlet
pipe ( 1 / 2 " O.D.) with two clamps. This end is covered
with an insulation material. Carefully remove the
insulation and loosen clamps enough to pull the formed
end o f the capillary tube out fro m und er the clamps.
Solvent clean pipe area to remove rem ain in g insulation
material and dirt.
4. Identify area by m ark in g the capillary tube
location on the inlet pipe from where it was removed.
The replacement switch’s tube should be installed at this
location.
Installation
1. M ount switch body to previous location. Do not
over-torque screws. The recom m ended reassembly torque
is 15-20 in. lbs. Do not d am ag e or distort the switch
body, as this m ay affect switch calibration.
2. M ount fo rm ed end o f capillary tube to the inlet
pipe in SAME PO SITIO N AS TH E O R IG IN A L tube.
D O N O T INSTALL N E W TUBE M O R E T H A N 1/2" in
either direction o f previously m arked location.
3. Adjust each clam p before tightening so that
width o f the clam p covers the capillary tu b e ’s formed
end. Tighten to 1.69 to 2.25 N m (15 to 20 in. lbs.) o f
torque. Do not overtorque.
4. Re-cover tube and pipe with insulation material.
I f original insulation is dam aged, replace with same type
material. (G M P D Part No. 3014431 or equivalent).
5. Reconnect electrical terminals.
D ISC H A R G E PRESSURE S W ITC H
The discharge pressure switch is located in the
condenser to e v ap o rato r line (fig. IB-44).
Replacement
1. Disconnect the battery ground cable.