Pontiac FIREBIRD 1972 Service Manual page 1432

ACCESSORIES 15-17
IGNITION SUPPRESSION EQUIPMENT
Various types of ignition suppressors are used to prevent
spark noise from interfering with radio reception. Failure
of any of these parts to function properly is accompanied
by a popping noise. The noise increases as the engine is
accelerated and varies with engine speed.
Interference or electrical noises which are amplified by the
radio fall into two basic classifications: "normal" and "ab-
normal". Interference or an electrical noise is considered
"normal" if it occurs when the customer manually operates
a switch or accessory in the car. Interference or an electri-
cal noise that occurs without the customer manually oper-
ating a switch is considered "abnormal". (e.g., alternator
whine, transmission switch pop, etc.)
Some types of interference and electrical noises that are
considered "normal" are:
1. Blower switch
2. Power window motor
3. Ignition key door buzzer
4. Brake warning light
5. Turn signal
6. Cruise control
7. Cigar lighter
8. Power seat switch
9. Windshield wiper switch
10. Headlight switch
The following is a list of suppression equipment which is
installed on 1972 Pontiac models:
1. Ground strap from the rear of engine to firewall
(All).
2. 0.3 Mfd. capacitor on ignition coil
("+"
terminal,
V-8 engines only).
3. 0.25 Mfd. coaxial capacitor in blower motor feed
(FM radio only).
4. 0.5 Mfd. capacitor in fuse block "BAT" terminal
(except A Series).
5. Hood ground clip (All).
6. 0.5 Mfd. capacitor on A/C master relay (B Series
only).
7. Distributor point shield (V-8 engines only).
SLIDING SUNROOF (X SERIES)
The sun roof consists of two (2) layers of fabric; an outside
water repellent material bonded to a grained vinyl coating
and an inner layer of vinyl headlining. Roof bows fitted
between the two (2) layers shape the sunroof to the con-
tour of the roof panel.
Nylon caps on the ends of the front header and on two
roof bows slide in the side channels when the sunroof is
opened or closed.
To unlock the sunroof, pull the release handle down, and
turn counterclockwise (1 80"). While holding the handle,
pull the panel back to full open and return forward to the
desired position, then turn handle clockwise (1 80") and
fold handle flush. Do not pull on either side of roof to open
or close. The closing action secures the sunroof in any
open position, and protects against possible head impact
(by folding handle flush). To reduce air turbulence at
highway speeds, do not open beyond the mid position, and
fold handle flush to close. To lock, move sunroof fully
forward with handle to engage lock-catch, then turn han-
dle clockwise (180") and fold handle flush.
During the latching operation, the initial rotation of the
handle moves the latch hook left to engage the front re-
tainer and then continued rotation pulls the sun roof for-
ward for a tight cover over the opening. The last few
degrees of handle rotation cause an internal cam to force
the front edge of the header down for a tight seal to the
roof panel.
No maintenance is required except to periodically wipe
slide rails with a clean cloth. Cleaning of the inside or
outside surfaces should be done with soap and water. Use
of detergents is not advisable.