1973 OPEL GT-R door lock

2. Press off snap ring holding drive pinion in place
and remove drive pinion (see Figure 2F-10).
Installation1. Install drive pinion reverse of removal.
NOTE: If drive pinion is to be replaced, also replace
both cables to insure smooth operation of sun roof.
2. Rotate cable crank to its limit in a clockwise direc-
tion and install reverse of removal procedure.ROOF AND SUN ROOF2F-31
REMOVAL AND INSTALLATION OF FRONT AND
REAR WATER DRAINAGE HOSES
Removal of Front Water Drainage Hose
1, Remove sun visor from side of car which will have
drainage pipe taken out.
2. Partially detach pinchweld finishing strip from
door opening involved.
II2F-12L
Figure 2F-12 Sun Roof (Exploded View)

26-341973 OPEL SERVICE MANUAL
a 13/16 inch deep socket, and remove. See Figure2G-6.Figure
ZG-4 Seat to Underbody Hook
Figure
ZG-5 Seat Back Metal Tabs
3. Remove seat back towards the top.
REMOVAL AND INSTALLATION
OF GLOVE
COMPARTMENT DOOR LOCK
1. Unscrew nut of glove compartment lid lock, usingFigure ZG-6 Removing Glove Compartment Lock
2. Install new glove compartment lid lock.
REMOVAL AND INSTALLATION OF FRONT SIDE
PANEL TRIM PAD
1, Lift up door sill shield and pull off sealing strip up
to the instrument panel cover. See Figure 2G- 7.
Figure
ZG-7 Pulling Off Sealing Strip

2G-361973 OPEL SERVICE MANUAL
3. Install and align the remaining five listing wires.
If required, caulk retainers of 2nd and 5th listing
wires so that wires run in a straight line transversally
under the roof. See Figure
2G-9.Figure ZG-10 3rd. 4th and 6th Listing Wire
Attachment4. Lightly pull headlining towards the rear and ce-
ment to the rear roof frame cross member and then
to the rear quarter pillars using rubber cement.
When pulling headlining toward rear be sure that the
listing wires are not pulled out of line. A folded clothshould be used to smooth down cemented portions
of headlining.
5. Cut off surplus headlining along rear window, rear
quarter windows, and windshield, leaving enough to
tit under rubber channels.
6. Cement surplus material to pinchweld flanges.
7. Cut off excess headliner around door openings and
cement trimmed edge to pinchweld flange using rub-
ber cement.
Figure 2G-12 Quarter Window and Lock Pillar Sealing
StripFigure
2G-1 1 Lock Pillar Shield Attaching ScrewsFigure 2G-13 Trim Pad and Retaining Button

9A-i2 1973 OPEL SERVICE MANUAL
Check that air doors and water temperature control
valve are operating properly.
Check for plugged heater core-backflush heater core
as necessary.TROUBLEInadequate defrosting action.
CAUSE AND CORRECTIONExamine heater-defroster door for proper operation.
Adjust bowden cable so that door is fully closed in
FULL DEFROST position.
Check that air hoses connecting to defroster outlets
are secure.
Check for air leaks around edges of heater air dis-
tributor housing. Seal leaks, as necessary, with bodysea@. Check for body air leaks and seal, as neces-
sary, with body sealer.
TROUBLEBlower inoperative.
CAUSE AND CORRECTIONCheck blower fuse. Replace, if necessary, fuse posi-
tion 4
- amperage 15.
Check wiring for open circuit. Correct, as required.
Inspect for defective component, (i.e., blower switch
or blower motor)
- replace or repair as necessary.
MAINTENANCE AND ADJUSTMENTS
CONTROL CABLE ADJUSTMENTAdjustment of control cables is accomplished by po-
sitioning of the jacket or sheath of the control cable,
as held by the clamps on the control assembly and
heater case or by loosening screws and slidingbowden wire to obtain desired door or water valve
position.
MAJOR REPAIR
REMOVING AND INSTALLING HEATER HOUSING
Removal1. Unscrew hood lock together with ground wire(ground wire only on vehicles with radio interference
suppression). See Figure 9A-33.
Figure 9A-33 Hood Lock Attachments
2. Unscrew heater housing cover.
3. Pull hose of windshield washer system off jet and
take jet out of housing cover.
4. Unscrew bowden control wire from heater valve.
5. Unscrew heater housing from dash panel and pull
it off carefully. See Figure 9A-34.
Figure 9A-34 Heater Housing Attachments
6. Remove water hoses from heater core and pull
heater core out of heater housing. See Figure
9A-35.

98-20 1973 OPEL SERVICE MANUAL
If we were to put a thermometer in the cold drain
water, we would see the temperature gradually creep
upwards. That is to be expected because heat is flow-
ing into the cold water making it warmer. Before
long the water would be as warm as the stored foods.
Then the water could no longer attract heat because
heat will not flow from one warm object to another
equally warm object. Since we no longer can draw
heat out of the foods we no longer are cooling them.
Now, let’s see what happens when we put ice instead
of cold water into the ice-box. This time, we’ll set the
thermometer on top of the ice (Fig. 9B-5). When wefirst look at the thermometer, it reads 32 degrees. A
couple of hours later, we open the ice compartment
door. The ice block is smaller because some of the ice
has already melted away
- but the thermometer still
reads 32 degrees. Again, still later, even more of the
ice has melted, yet the termometer continues to read
32 degrees. So long as any ice remains, no matter
how much of it has melted away, the temperature of
the ice stays right at 32 degrees.
All this time the ice has been soaking up heat, yet it
never gets any warmer no matter how much heat it
draws from the stored food. On the other hand, the
cold drain water got progressively warmer as it
soaked up heat. Why is it the addition of heat will
make water warmer yet won’t raise the temperature
of ice above the 32 degrees mark? If we till one
drinking glass with ice and another with cold water,
and put both glasses in the same room where they
could absorb equal amounts of heat from the room
air, we will find it takes much, much longer for the
ice to melt and reach room temperature than it did
for the water in the other glass to reach the same
temperature. Obviously, most of the heat was being
used to melt the ice. But it was the heat that appar-
ently disappeared or went into hiding because if
couldn’t be located with a thermometer. To best de-
scribe this disappearing heat, scientists turned to
Latin for the right word. They chose the word “la-
tent” which means hidden.
Latent Heat
So latent heat is nothing more nor less than hidden
heat which can’t be found with a thermometer.
What happens to the latent heat? Where does it
disappear to? At first it was thought it was in the
water that melted from the ice. But that wasn’t ex-
actly the right answer because, upon checking water
temperature as it melts from ice, it will be found that
it is only a shade warmer than the ice itself. It is not
nearly warm enough to account for all the heat the
ice had absorbed. The only possible answer is that
the latent heat had been used up to change the ice
from a solid into a liquid.
Many substances can be either a solid, or a liquid, ora gas. It just depends on the temperature whether
water for example was a liquid, or a solid (ice), or gas
(steam) (Fig.
9B-6).Figure 99-6 Temperature Determines State of Water
If we put some water in a tea-kettle, set it over a tire
and watch the thermometer as the water gets hotter
and hotter, the mercury will keep rising until the
water starts to boil. Then the mercury seems to stick
at the 212 degrees mark. If we put more wood on the
fire, despite all the increased heat, the mercury will
not budge above the 212 degree mark (Fig.
9B-7).Figure 98.7 Boiling Water Never Exceeds 2 12
DegreesEven though many housewives won’t believe it, no
matter how large or hot you make the flame, you
can’t make water hotter than 2 12 degrees. As a liquid
changes into a gas, it absorbs abnormally great
amounts of heat without getting any hotter. Here is
another instance where heat disappears.
Now we have two different kinds of latent heat,
which are quite alike. To keep their identities sepa-
rate, the first one is called latent heat of fusion. Since
fusion means the same as melting, it is a good de-
scriptive name. The other kind is called latent heat
of vaporization because‘ that means the same as
evaporation.
It may seem as though we have drifted into a story