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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 GM specification 1899-M, to provide
the required freezing and corrosion protection
-at least a 50 percent solution (-20°) . Fill
radiator to the base of the radiator filler neck
and bring level of coolant in the recovery tank
to the "FULL HOT" mark . Reinstall recovery
tank cap .
9. Run engine, with radiator cap removed,
until radiator upper hose becomes hot .
10. With engine idling, add coolant to radia-
tor until level reaches bottom of filler neck; in-
stall cap making certain arrows line up with
overflow tube.
11. Add sufficient coolant to coolant reservoir
to raise level to the "HOT" mark . Install reser-
voir cap.
IMPORTANT : MotorHome is equipped with
water heater pre-heat, coolant level in coolant
reservoir must be checked and coolant added, as
necessary, after several hours of operation. The
additional length of heater hose used in this
system requires a longer period to normalize the
coolant level.
Owner Responsibility
It is the owner's responsibility to :
Maintain cooling system freeze protection at
-20°F or below to ensure protection 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 ad-
ditions are required because of coolant loss
or to provide additional protection against
freezing at temperatures lower than -20°F
(-35°F in Canada) .
NOTE : Alcohol or methanol base coolants or
plain water are not recommended for your
vehicle at any time .
71
THERMOSTAT
The cooling system is protected and con-
trolled by a thermostat installed in the engine
coolant outlet to maintain a satisfactory operat-
ing temperature of the engine. This thermostat
is designed for continuous use through both
winter and summer and need not be changed
seasonally. When replacement is necessary,
Delco parts are recommended.
ENGINE FUEL SYSTEM
FUEL REQUIREMENTS
Your vehicle's engine is designed to operate
on unleaded gasoline of at least 91 Research
Octane . The gasoline should also have a Motor
Octane of at least 83. This gasoline will mini-
mize spark plug fouling and emission control sys-
tem deterioration . Regular grade leaded gasoline
should be used only when needed to eliminate
knock, a metallic rapping noise generated dur-
ing the combustion process . The engine does not
require Premium grade fuel. Thereafter, its use
would be an unnecessary additional expense. If
knocking persists, consult your authorized dealer.
Continuous or excessive knocking may result in
engine damage and constitutes misuse of the
engine for which the manufacturing division is
not responsible under terms of the new vehicle
warranty.
NOTE: Some engines may be designed for un-
leaded gasoline ONLY and have provision for
the prevention of use of leaded gasoline.
If the service station gasoline pump has a
symbol similar to the one below, use unleaded
gasoline with a symbol number of 2. Leaded
regular grade gasoline
(symbol number 3 )
should be used only when needed to eliminate
knock. If the pump has a label indicating gas-
oline octane quality in terms of the average of
Gas Pump Symbols
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