Cadillac 1975 Owner's Manual page 70

6. Allow system to drain completely and
then close radiator drain valve tightly.
(Install block drain plugs, if removed.)
7. Remove recovery cap leaving hoses in
place. Remove coolant recovery tank,
empty fluid, scrub and clean bottom
and sides of tank with detergent and
water, flush well with clean water,
drain and reinstall.
8. Add sufficient ethylene glycol coolant,
meeting CM specification 1899-M, to
provide the required freezing and cor¬
rosion protection — at least a 50 per¬
cent solution (-40°F.). Fill radiator to
the base of the filler neck and bring
level of coolant in the recovery tank to
the "FULL HOT" mark. Reinstall re¬
covery tank cap.
9. Run engine, with radiator cap removed,
until radiator upper hose becomes hot.
10. With engine idling, add coolant to
radiator until level reaches bottom of
filler neck; install cap making certain
arrows line up with overflow tube.
It is the owner's responsibility to:
• Maintain cooling system freeze protec¬
tion at -40°F. or below to ensure pro¬
tection against corrosion and loss of
coolant from boiling, even though
freezing temperatures are not expected.
• Add ethylene glycol base coolant that
meets GM Specification 1899-M when
coolant additions are required because
of coolant loss or to provide additional
protection against freezing at tempera¬
tures lower than -40°F.
NOTE: Alcohol or methanol base coolants or
plain water are not recommended for your
Cadillac at any time.
THERMOSTAT
The cooling system is protected and control¬
led by a thermostat that maintains a satisfac¬
tory engine operating temperature. This ther¬
mostat is installed in the engine coolant outlet
and is designed for continuous use through
both winter and summer. When replacement
is necessary, Delco Parts are recommended.
Rear Axle or Final
Drive Lubricant
Every 6 months or 7,500 miles, whichever
occurs first, check lubricant level* and add
lubricant, if necessary, to fill to level of filler
plug hole. Use SAE 80W or SAE 80W-90 GL-5
Gear Lubricant. For those vehicles normally
operated in Canada, use SAE 80W GL-5 Gear
Lubricant.
*Clean area around filler hole before remov¬
ing filler plug and take care to prevent dirt from
entering hole and contaminating the lubric¬
ant.
Heavy Duty Operation — Change axle or
final drive lubricant each 15,000 miles.
CONTROLLED DIFFERENTIAL — Drain
and refill after the first 15,000 miles with spe¬
cial gear lubricant available from your Cadil¬
lac Dealer.
Power Steering System
Check the fluid level in the pump reser¬
voir at each oil change period. Add GM
Power Steering Fluid (or Automatic Trans¬
mission Fluid DEXRON ® II) as necessary to
bring level into proper range on filler cap
indicator depending upon fluid temperature,
Fig. 5-6.