coolant temperature CHEVROLET MONTE CARLO 1981 4.G Owners Manual

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syMBOL CH'AR't
- The followin g-chart will heJp you under stand the meaning of -the new
pictorial
sY"":lboJs use9 for~i4enti-fying,c ontFols and displ~ys pn you r v~hicle.
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HAZARD WA RN ING FlASHER W INOSHI ELDWII'ER
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, WINDSH IELD
WASHER
I----~---tl R EAR W INDOW
D EFOGGER
ENGIN E COOLANT TEMPERATURE
WINDSHIELD WIPER 80 WASHER
.. SEATBfL T '
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< , ". 1--' "'"'AT~TE="""-! CHARGI NG
CONDITION " VEN
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ATING FAN
FUEL
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1------; :,'", CLEARANCE .;---LICHTER " " ,LA.MPS RADIO SE.t,;EtTOR
WINDSHIE LD
, OEFROSTER
ENGINE OIL '.'
TRUNK RELEA SE
RADIO VO LU ,.,E

Downloaded from www.Manualslib.com manuals search engine When the ignition key is turned to the OFF position, the pointer may nO\". necessarily return to the 0 RPM position. For the tachometer to regster 0 RPM .
the key
must be in the RUN position and engine not running.
Engine Temperature Gage
This gage indicates coolant temperature which will vary with air temperature
and operating
cond~ions. The ignition must be on for accurate readings. Hard
driving
or prolonged idling in very hot weather will cause the pointer to move
beyond the center of the band. Should pcinter move to the line at the "H" end
of the band , see "Engine Cooling
System" on page 3-3.
Voltmeter
When the engine is operating, the voltmeter indicates the electrical system
voltage. During minimum electrical load, the pointer will read
to the right of the
center. As the electrical load is
increaSed, or in stop-and-go driving, the pointer
will rotate to the
left . A meter reading continuously in the left or right red zone
indicates an electrical system failure. Cause of the failure should be determined
and corrected.
Oil Pressure Gage
The oil pressure gage indicates the pressure at which oil is being delivered to
the various parts of the engine requiring lubrication. Pressures registered by the gage may vary according to outside air temperatures or weight of oil being
used. Oil pressure
of a cold engine being operated at a given speed will be
somewhat higher than when the engine is at normal operating temperature at
the same speed. Prolonged high speed operation on a hot day at the given
speed will result
in somewhat lower oil pressure readings. Readings of 205 to
275 kPa (30 to 40 psi) may be considered normal during moderate road
speeds of 35 to 40 mph (55 to 60 km/h) with the engine at proper operating
temperature . Gage readi'rig;rwhich are ·consistently high or low under these
conditions may indicate lubrication system and/or engine malfunction.
Windshield Wiper and Washer
The windshield wiping system operates at two speeds and is designed to wipe
clear
specijic areas of the windshield under most inclement weather conditions.
The windshield wipers work electrically and are not affected by engine
operation .
Push the control lever to the right to start
the electric windshield wiper. The
two-speed electric wiper has both a "low " and a "high " speed position .
2-19

Downloaded from www.Manualslib.com manuals search engine "the "TEMP" light comes on (or, if you have a 900lant temperature gage, the
gage needle goes into the warning zone) and your air conditioner is on, turn it
off.
If the "TEMP" light (or gage) comes on while you are stopped in traffic,
shift the transmission to
"N" (Neutral).
If the "TEMP" light doesn't go off (or the gage needle doesn't start to drop)
within a minute or two:
• Pull over to a safe Place ""d stop the vehicle. Set the parking brake and
shift to "P" (Park) 9r, with a manual transmission, shift to Neutral first, then
set the parking brake.
• DON'T TURN OFF THE ENGINE. INCREASE THE ENGINE SPEED until it
sounds like it's going about twice as fast as normal idle speed. Bring the
idle speed back to normal
after two or three minutes.
tfthe "TEMP" light still doesn't 90 off, (or the gage needle doesn't start to
drop),
NOW TURN OFF THE ENGINE and proceed as follows.
•
lift the engine hood. Look at the coolant level in the "see through" coolant
recovery tank. The coolant level. should be at or above the "Full Cold"
mark on the tank. If it looks like the coolant is boiling, wait until it stops
before proceeding. You should not need to remove the radiator cap to
check the coolant
level and. it can be dangerous if the coolant is still hot. See the following Caution.
CAUTION: To help avoid being burned:
"'-'''''''''i',",,;0-Fc:io'ffi)tcremoy'J~_ c;<)olant recovery tank cap if the coolant is boiling, and
• do not remove -the radiatorc:ap WhilethIit8ngine'-aUid:radiltor a,.Slili hot.
Scalding fluid and steamean be released under pressure it either cap is taken off too soon,
-;<
• If coolant level is low:
•
looklorleaks at the radiator hoses and connections, heater hoses and
connections,
r"diator,and water pump. See that the. fan belts are not
broken or off the pulleys an.d that the fan turns when the engine is started,
•
Add coolant to the recovery tahk.
If
the cQolant level in the recovery tank is althe correct lellel arid the "TEMP"
light (gage) still co"",s.dn,. air may be tr~ in the cooling system, This may
stop coolant from returning to the radiator. In this case, you may have to add
coolant directly to the radiator.
See "Coolant Replacement" under engine
cooling system
in "Service and Maintenance," Section 5 of this manual. Follow
steps 1 and 10. for the correct way to remove the radiator cap and add .coolant
to the radiator.
After the
"TEMP" light is out (or the gage needle is out of the warning zone),
resume driving at a reduced speed. Return to normal driving after about ten
minutes if the light does not come back
on (or the gage needle does not go
back into the warning zone).
3-4

Downloaded from www.Manualslib.com manuals search engine COOL
WARM
Add just enough DEXRO~ II fluid to fill the transmission to the proper level. It
takes only 0.5 liter (one pint) to raise the level from "Add" to "Full" with a hot
transmission.
Automatic Transmission Drain Intervals
Change the transmission fluid and change the filter (or clean the screen) as
outlined
in Section A of the Maintenance Schedule folder.
ENGINE COOLING SYSTEM
Your vehicle has a coolant recovery system. Coolant in the system expands
with heat and overflows into the recovery tank. When the system cools down,
coolant is drawn back into the radiator.
The cooling system was
filled at the factory wrth a quality coolant that meets
GM
Spec~ication 1S99-M . The cooling ·system is designed to use coolant (a
mixture of water and ethylene glycol antifreeze) rather than plain water. The
coolant solution should be used year round.
It has many advantages, such as:
~ provides freezing protection down to -3rC (-34"F) "''''''<~. !'"","."" ' • provides boiling protection up to 12S"C (262"F),
• protects against rust and corrosio~in th~ cooling system,
• maintains the proper engine temperature for efficient operation and
emission control, and
• allows proper operation of the coolant temperature light or gage :
See Section A of the Maintenance Schedule folder to find out when the coolant
must
be ·replaced.
Cooling System Care
Check the c60ling system at regular intervals, such as during fuel stops . You usually do not need to remove the radiator cap to check the coolant level. Lift
the engine hood and look at the "see through" coolant recovery tank. When
the engine is
cold, the coolant level should be at the "Full Cold" mark on the
tank . When the engine has fully warmed . up, the level should be above the
"Full Cold" mark on the tank . If the coolantl6vel is low, remove the cap on the
coolant recovery tank. Add to the recovery tank enough of a 50/50 mixture of
water and a good quality ethylene glycol antifreeze to bring the
level up to the
proper mark. Put the cap back on the recovery tank.
Certain conditions, such
as air trapped in the system, may affect the coolant
level in the radiator. You should check"the coolant level in the radiator at the
time you change the engine
oil and when the engine Is cold. Follow.taps I, S,
9, and 10 under "Coolant Repfacement" for the correct way to remove the
radiator cap and add coolant.
5-6

Downloaded from www.Manualslib.com manuals search engine 4. Close the drain valve. Install the block drain plugs, if removed. Add water
until the system is
filled and run the engine until the upper radiator hose is
hot
again.
5. Repeat steps 3 and 4 several times until the drained liquid is nearly colorless.
6. Drain the system, then close the radiator drain valve tightly. Install block
drain plugs, if removed.
7. Disconnect all hoses from the coolant recovery tank. Remove the recovery
tank
and pour out any fluid. Scrub and clean the inside of the recovery
tank with soap and water. Flush it well with clean water, then drain it.
Reinstall the recovery tank and hoses.
8. Add enough water and ethylene glycol antifreeze (meeting GM
Specification 1899-M) to provide the required cooling, freezing and
c()rrosion protection, Use a solution that is at least 50 percent antifreeze out no mOre than 70 percent antifreeze. Fill the radiator to the base of the
filler neck
and fill the coolant recovery tank to the "Full Hot" mark. Put the
recovery tank cap back on.
9. Run the engine, with the radiator cap removed, until the upper radiator
hose is hot.
10. With the engine idling, add coolant to the radiator until it reaches the
bottom of the filler neck. Install the radiator cap, making sure the arrows on the cap line up with the overflow tube.
iI is the owner's responsibility to,
'. -Main)!!!n cooling system freeze protection at -3rC (-34'F) to ensure protection against corrosion and loss of coolant from boiling. (A 50/50
mixture of water and ethylene glycol antifreeze will provide freeze
protection to -37'C or -34'F.) You should do this even if you don't
expect freezing temperatures.
• Add ethylene glycol base' antifreeze that meets GM Specification 1899-M
when antifreeze haS to be added because of coolant loss or for more
protection against freezing at temperatures lower than -37'C (-34'F).
NOTICE: Do "otute methanol-base antifreeze, Of alcohol,or plain water alone, in your vehicle at any time. They will boil at a lower point than that at which the "TEMP"
light (or temperature gage) will warn of overheating,. and they do not provide proper protection against cOrrosion.
Radiator Pressure Cap
The radiator cap, a 105 kPa (15 psi) pressure type, must be installed tightly,
otherwise coolant may be lost and damage to engine may result from
overheating. Radiator pressure
caps should be checked periodically for proper
operation. If replacement is required, an AC cap is recommended.
Thermostat
The engine coolant temperature is controlled by a thermostat. It stops coolant
flow
through the radiator until a preset temperature is reached. This thermostat
is installed in the engine
coolant outlet on the engine block. The same thermostat is used in both winter and summer. When a replacement is needed, AC"Delco parts are recommended.
5-8