Opel 1900 1973, Service Manual

Page: 521 / 625

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.
T R O U B L E
Inadequate defrosting action.
CAUSE AND CORRECTION
Examine heater-defroster door for proper operation.
Adjust 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 body
Check for body air leaks and seal, as neces-
sary, with body sealer.
T R O U B L E
Blower inoperative.
CAUSE AND CORRECTION
Check 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.
M A I N T E N A N C E A N D A D J U S T M E N T S
C O N T R O L C A B L E A D J U S T M E N T
Adjustment 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 sliding
wire to obtain desired door or water valve
position.
M A J O R R E P A I R
REMOVING AND INSTALLING HEATER HOUSING
R e m o v a l
1. Unscrew hood lock together with ground wire
(ground wire only on vehicles with radio interference
suppression). See Figure
Figure Hood Lock Attachments
2. Unscrew heater housing cover.
3. Pull hose of windshield washer system off jet and
take
out of housing cover.
4. Unscrew control wire from heater valve.
Unscrew heater housing from dash panel and pull
it off carefully. See Figure
Figure Heater Housing Attachments
6.
Remove
water
hoses from heater core and pull
heater core out of heater housing. See Figure