1973 OPEL GT-R Service Manual

Figure 98-197 Electrical Connections
Installation
1. In611 the resistor assembly and two (2) attach-
ing screws. See Figure
9B-198.
Figure ?B-198 Resistor Assembly Attaching Screws
2. Install the electrical plug connector.
3.
In&l the evaporator cover and attaching
screws. See Figure
9B-195.
4. Install the luggage tray and attaching screws. See
Figure
?B-194.
5. Install the negative battery cable
AIR CONDITIONER SYSTEM. GT9t3.101
REMOVAL AND INSTALLATION OF BLOWER
MOTOR ASSEMBLY
I. Disconnect the negative battery cable from the
battery.
Figure 98.200 Luggage Tray
Figure
98.201 Evaporator Cover Assembly and
Attaching Screws

98-102 1973 OPEL SERVICE MANUAL
2. Discharge system. Refer to DISCHARGING
SYSTEM in Refrigerant Components Section.
3. While system is discharging remove the luggage
tray attaching screws and lift out tray. See Figure9B-200.
4. Remove all evaporator cover screws and remove
cover. See Figure
9B-201.Figure
98.202 Evaporator Cover and Luggage Tray5. Remove the electrical plug connector from the
resistor assembly, and unplug blower motor connec-
tion and remove ground wire. See Figure
9B-203.6. From underneath evaporator housing, discon-
nect 2 drain hoses. See Figure 9B-204.
EVAPORATORFigure
98.204 Drain Hose
7. From under car remove 4 nuts securing evapora-
tor mounting bracket to floor. See Figure 9B- 205
and 9B-206.
Figure
98.203 Electrical Connections and Ground
WireFigure 98-205 Evaporator Mounting Bracket Bolts -Driver Side

AIR CONDITIONER SYSTEM. GT9s. 103
Figure 98.206 Evaporator Mounting Bracket Bolts
Passenger Side8. Remove inlet and outlet pipes from evaporator
and tape closed the refrigerant lines and also the
open ends of the inlet and outlet pipes of the evapora-
tor. See Figure 9B-208.
SEAL
9870Figure 98.208 Inlet and Outlet Pipes and O-Rings
9. Lift off the mounting bracket and remove the
evaporator assembly from the car.
10. Remove the resistor assembly. See Figure 9B-
203.Figure 98.209 Evaporator and Blower Assembly
11. Remove blower case and blower motor attaching
screws and remove assembly.
Installation
1. Install blower motor assembly in the bracket with
Figure 98.210 Electrical Schematic

98-104 1973 OPEL SERVICE MANUAL
the el&trical connector side of the motor to the right
side of the bracket.
2. Assemble the fan housing case halves and attach
the cover plate.
3. Install the resistor assembly.
4. Install the evaporator assembly into the car and
install mounting bracket. See Figure
9B-209.5. Untape the refrigerant lines and the inlet and
outlet pipes from the evaporator and install using
new o-rings on line fittings.
6. From under the car, install 4 nuts securing
evaporator mounting bracket to floor. See Figures9B- 205 and
9B-206.7. Evacuate system. Refer to EVACUATING SYS-
TEM in REFRIGERANT COMPONENTS Sec-
tion.
SPECIFICATIONS8. While system is being evacuated:
9. Connect 2 drain hoses underneath the evaporator
housing.
10. Plug in the resistor assembly electrical connector
plug and connect the blower motor connection and
install ground wire and 2 mounting bracket to case
screws using the rearward holes.
S’ee Figure 9B-209.11. Install the evaporator cover and all cover screws.
See Figure 9B-202.
12. Install luggage tray and attaching screws. See
Figure
9B-202.13. Connect the negative battery cable.
14. Charge system. Refer to CHARGING SYSTEM
in Refrigerant Components Section.

RADIO. GT9c- 105
RADIO
GTCONTENTS
Subject
DESCRIPTION AND OPERATION: (Not Applicable)
DIAGNOSIS:
RadioTroubleDiagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAINTENANCE AND ADJUSTMENTS:
Antenna Trimmer Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAJOR REPAIR:
RemovingandInstallingRadio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS: (Not Applicable)
Page No.
9c-105
9C-106
9c-107
DIAGNOSIS
RADIO TROUBLE DIAGNOSISBecause radio problems are most often repaired at
United Delco authorized warranty repair stations,
the tendency for many dealer servicemen is to
remove the set when a problem is reported, without
any preliminary diagnosis. This results in a large
number of radios showing up as “NO TROUBLE
FOUND” units when received by the warranty re-
pair stations. This indicates that the trouble can
often be corrected without removal of the radio.
The inconvenience to an owner of driving without a
radio while his set is being serviced at a warranty
station can frequently be avoided if the following
quick checks are used to eliminate external radio
system :problems before removing the radio for re-
pair.
Always determine from the owner the exact nature
of the radio problem as an aid to diagnosis. Knowing
whether the condition is intermittent or constant,
whether it occurs with engine off or running, with
car stationary or moving, will help to pinpoint the
problem. Never turn on radio with speaker discon-
nected.
Radio Ii
Inoperative.1. Turn on the radio. The dial should light and a
thump should be heard from the speaker.a. If a thump is heard, go to Step No. 2 for antenna
check.b. If no thump is heard,
check the fuse.
(1) If fuse is bad, replace and try radio again. Race
engine and, if fuse blows again,‘remove the radio and
speaker assembly for repair by
4 trained radio techni-
cian.
(2) If fuse is good, check to
s&e that the speaker-to-
receiver interconnecting cable is connected securely.
If there is still no thump when the radio is turned on,
remove the receiver and speaker for repair.
2. Check the antenna by substituting with one held
out the car window.
a. If radio is still dead with substitute antenna,
remove the receiver and spea!er for repair.
b. If radio operates near normal with substitute an-
tenna, some part of the car antenna or lead-in is at
fault.
Radio Reception Is Weak1. Check to see if antenna trimmer is peaked.
a. Position antenna at a height of 31 inches.
b. Tune radio to weak station at or near 1400 KHz
on the dial, and turn volume control to maximum.

9C-106 1973 OPEL SERVICE MANUAL
c. Adjust trimmer screw for maximum volume.
d. If antenna trimmer does not have a definite peak, check for defective antenna by substitution.
2. Check that the speaker connection is plugged in
SXUdY.
3. If the radio is still weak, remove the receiver and
speaker assembly for repair.
Radio Is Noisy
1. Radio is noisy all the time:
a. Check for defective antenna by striking antenna
with hand. If static is heard while tapping, replace
antenna.
b. If antenna is not defective, remove receiver and
speaker for repair.
2. Radio is noisy only when jarred:
a. Check antenna as in Step No. 1 above.
b. Check speaker connection. If speaker connection is not at fault, remove receiver and speaker for re-
pair.
3. Radio is noisy when engine is running:
a. Check noise suppressor by substituting on genera-
tor with known good one.
b. Check to see that antenna is mounted securely,
grounding the antenna base to the fender. The an-
tenna lead-in wire is shielded and the shield should
have good ground connection at the receiver and the
antenna base.
c. Check for other car wiring, passing too close to
radio receiver case.
d. If engine noise is still present, remove receiver and
speaker for repair.
4. Radio is noisy when car equipment is operated,
such as directional lights or brake lights:
Check for defective antenna lead-in wire or, loose
antenna mounting, as in Step No. 3b above.
MAINTENANCE AND ADJUSTMENTS
ANTENNA TRIMMER ADJUSTMENT
An antenna trimmer adjusment screw is provided for
matching of the antenna coil in the receiver to the car antenna. This adjustment must always be made after
installation of a receiver or an antenna, or after re-
pair to these units. This adjustment should also be
performed whenever radio reception is unsatisfac-
tory.
1. Position antenna to a height of 31 inches.
2. Tune receiver
tb a weak station at or near 1400
KHz that can barely be heard
with volume turned
fully up.
3. Insert a small-bladed screwdriver in antenna trim-
Figure 9C-1 Location of Access Trim Plug
Figure
9C-2 Removing Hex Head Screw

RADIO - GT9c. 107mer screw and rotate screw until maximum volume
is achieved.
MAJOR REPAIR
REMOVING AND INSTALLING RADIORemoval
1.
Disc&ect battery.
2. Remove access trim plug from right side of con-
sole. See Figure
9C-1.Figure
9C-3 Location of Access Trim Cover3. Using a 8mm socket, remove hex head screw. See
Figure
9C-2.4. Remove access trim cover on left side of console.
See Figure
9C-3.5. Using a 4mm socket, remove
hex head screw. See
Figure
9C-4.6. Remove tear lock bolts by first,drilling a 3/16 inch
pilot hole and, using a
l/4 inch bolt extractor,
remove bolts. See Figure
9C-5.Figure
9C-5 Drilling Pilot HoleIn\, Tear Lock Bolts7. Disconnect ignition (white) and direction signal
(black) wire set plugs.
8. Support steering column assembly and remove
both hex head bolts.
9. Disconnect speedometer
cabI&10. Remove 6 instrument cluster retaining screws.
See Figure
9C-6.Figure SC-4 Location of Hex Head Screw and Flasher
UnitFigure SC-6 Removing Instrument Cluster Retaining
screws

9C-108 1973 OPEL SERVICE MANUAL
11. Grasp instrument cluster and pull straight back,
being careful of wires, etc. See Figure 9C-7.
Figure 9C-7 Removing Instrument Cluster
12. Disconnect radio harness plug and antenna lead-
in cable from back of radio. See Figure
9C-8.
Figure 9C-8 Removing Radio Harness Plug
13. Remove radio knobs from radio.
14. While supporting radio, remove radio shaft re-
taining nuts. Remove radio. See Figure
9C-10.
CAUTlOk Fasteners in Installation are important at-
taching parts in that they could affect the perform-
ance of vital components and systems, and/or could
result in major repair expense. They must be re-
placed with one of the same part number or with an equivalent part, if replacement becomes necessary.
Do not use a replacement part of lesser quality or
substitute design. Torque values must be used
as
specified during reassembly to assure proper
reten;
tion of these parts.
Figure SC-10 Removing Radio Shaft Retaining Nuts
1. Install radio into instrument cluster and secure
with retaining nuts. See Figure
9C-10.
2. Plug radio harness and lead-in cable into radio.
See Figure
9C-8.
3. Install radio knobs and carefully push cluster back
into instrument panel housing, making sure electri-
cal wires, etc., are not pinched. See Figure
9C-7.
4. Install six (6) cluster retaining screws. See Figure
9C-6.
5. Support column assembly and install ground wire
and hex head bolts, torquing to
14 lb.ft.
6. Install NEW tear bolts and tighten until head of
bolt is twisted off.
7. Connect ignition and directional signal wire plugs.
8. Connect speedometer cable.
9. Install flasher unit and hex head screw. See Figure
9c-4.10. Install hex head screw through opening on right
side and install trim plug. See Figure
9C-2.
11. Install trim cover on left side. See Figure 9C-3.