1993 BUICK ROADMASTER cooling

Howev~r, 'il you want the
blower fan
f.0 run at a low&
speed, pukh v.
If you. want' to raise the
bloWer"spt%d,
push A, . ..'
.. 4 , !'
You can use this when you don't need to cool the
outside-air. The system will work as in the
AUTO mode
without cooling. The
air flow will come from the
instrument panel outlets.

i
the sun may adequately warm your upper body, but your
lower body may not be warm enough.
The Bi-level settbg directs outside air.into your vehicle
in two ways.-Cool air
is directed 'toward your upper
body through the front instrument panel outlets, ,while
slightly warmed
air is directed through the heater outlet
at
your feet.
.The air conditioner compressor operates in all Air
Conditioning positions, and the Defrost position when
.the outside temperature is above
40 OF (4.5 C).
R
Ventilation
For mild outside temperatures, when little heating ox ,
cooling is needed, slide the upper lever to Vent, Air will,'
flow through the .instrument panel outlets. Use the air
oudets to turn on, adjust and turn
off the air, flow. Adjust.
the lower lever to control the temperature;
'.
.. .
Heating
When outside temperatures are cold, 8liding:the upper .
lever to Heater and the' lower lever to :Warm will send,
heated air though the heater outlets, 'and-some through
the defroster vents. Vent and Heater arelabeled
economy positions. because the
dr conditioner
compres.sor doesn't run in these..two settings. "This . .
reduces engine load, resulting in impioyed I.. fyd.
economy.
Defrosting
The Defrost setting directs most of the- air through the
defroster vents, and some through.the heater outlets. Use
defrost when you want to remove fog
,6r ice from the
windshield.
133

m
m
II
L, CAUTIOP
You can be bu 3d if you spill coolant on hot
engine parts. Coolant contains ethylene
glycc
and it will burn if the engine parts are hot
enough. Don’t
spill coolant on a hot engine.
When the Luolant in the coolant recovery ~~IMC is “1 or
above
“FULL COLD,” start your vehicle.
If the overheat warning continues, there’s one more
thing
you can try. You can add the proper coolantmix
directly to the radiator, but be sure the cooling system is
cool before
you do it.
220

How to Add Coolant to the Radiator
..
i= :.
i i
i t
.. : :.c, - , -, I. .
I
-" I
-c
2. Then keep turning the
pressure
cap, but now
push down
as you turn
it. Remove the.
pressure cap.
. -..- '. . . . ., 3. Fill the. radiator with
the proper mix, up to
the base of the filler
neck.
1. You can remove the radiator pressure cap when the
cooling system, including the radiator pressure cap
and upper radiator
hose, is no longer hot. Turn the
pressure cap slowly
to the left until it first stops.
(Don't press down while turning the pressure cap.)
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.

er to your cooling system
can be dangerous. Plain water,
or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle’s coolant warning
system
is set for the proper coolant mix. Wi’th
plain water or the wrong mix, your engine could
get
too hot but you wouldn’t get the overheat
warning. Your engine could catch fire and you
or others could be burned. Use a
50/50 mix of
clean water and a proper antifreeze.
257

Sched.uled Maintenante Services Schedule I1
Follow Schedule. I1 ONLY if none of the driving conditions specified in Schedule I apply.
, TO BE SERVICED
(See Explanation of
Scheduled Maintenance Services Following Schedules
I and 11)
Item No.
I. Engine Oil Change"
Oil Filter Change"
2. Chassis Lubrication
3. Throttle Body Mounting Bolt Torque*
4. Tire & Wheel Inspection .& Rotation
5. Engine Accessory Drive Belt(s) Inspection*
6. Cooling System Service"
7. Front Wheel Bearing Repack.
WHEN TO PERFORM
Miles (kilometers)
or
Months, Whichever
Occurs First
, ..
I MILE,
KILOMEl
12.5 I 25 I 37.5
Every 7 500 mi. (12 500 km) or 12 mos. a 0 0
At first and then every other oil change a 0
Every 7 500 mi. (12 500 km) or 12 mos. 0 a 0
At 7 500 mi. (12.500 km) only 0
At 7 500 mi. (12 500 km) and then every
15 000 mi. (25 000 km) or as necessary Io
-~
Every 30 000 mi. (50 000 km) or 24 mos.
t ~~ .. Every 30 000 mi. (50 '000 km) ' ' '
; (000)
30 I 37.5 I 45
304

7.
8.
To help ensure-proper operation, we recommena a
pressure test of both’the cooling system and the
pressure cap. If you do not use your vehicle under any of these
conditions, change both the fluid and filter every
100,000 miles (1 60 000 km).
Front Wheel Bearing Repack - When your 9. Spark Plug Replacement* - Replace spark plugs
vehicle is used in such service as police work, as a with the proper type. See “Specifications Chart.’’ in
taxi or
in door-to-door delivery, clean and repackthe the Index.
front wheel bearings at each brake relining or
15,000 Spark plug Wire Inspection*? - Inspect for
miles (25 000 km), whichever comes first. If you
don’t use your vehicle in such service, clean
and
repack the bearings at each brake relining or 30,000 -
miles (50 000 km) whichever comes first. burns, cracks .or other damage. Check the boot fit
at
the distributor and at the spark plugs. Replace wires
as. needed.
Transmission Service - Change both the fluid and
filter every
15,000 miles (25 000 km) if the vehicle
is mainly driven under one or ‘more
of these
conditions:
In heayy city traffic where the outside
temperature regularly reaches
‘90 OF (32 C) or
higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police car or delivery
service.
11. Exhaust Gas Recirculation (EGR) System
Inspection*?
- Conduct the EGR system service
as described in the service manual.
To purchase a
service manual, see “Service Publications” in the
Index.
12. Air Cleaner Filter Replacement* - Replace every
30,000 miles (50 000 km) or more ofkn under dusty
conditions. Ask your dealer for the proper
replacement intervals for your driving conditions.
307
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