Pontiac TRANS AM 1977 Service Manual page 734

(or 1 emp. Gage)
"ON" OR
HOT TEMP.
CHECK SENDINC
!
O N C H A R T
SYSTEM
li-)
/ A ; T
ANTI-FREEZE
DIAGNOSIS CHART
I /
I
CHECK SENDING U N I T
I
B O I L I N G
'7
Use Pressure Cap Tester Per
Chassis Service Manual REPLACE
C O O L A N T LOSS
T'
Use Pressure Cap Tester Per
Chassis Service Manual
,
1
O.K.
,
TEMP
7
HOT TEMP
- - .
O K
'
,
f B A D
TIGHTEN T O SPEC. F A N BELT TENSION REPLACE
I I
t
I
O.K.
N O
COLLAPSED UPPER OR SYSTEM
LOWER R A D I A T O R HOSE?
1
1
C L E A N OR y E s
DIRT, BUGS, BENT FINS, ETC.
STRAIGHTEN
BLOCKING R A D I A T O R OR
1
I
A/C CONDENSER?
1
I
I
N 0
Y E S
A N Y FIXES A B O V E ?
If none o f the above required repair, the problem is
o u t o f the ordinary or of a major nature. Listed o n
Sheet 3 are t w o groups o f problem areas that should be
checked i n the order listed.
I. L E A K S
-
Check Hoses, Radiator, Clamps,
Water Pump, Thermostat Housing, Rad.
Drain, Soft or Core Plugs, Heater Water
Valves, Heater Core.
!. F O A M I N G C O O L A N T
-
Observe i n filler
neck after engine warmup.
I. OVERFLOW SYSTEM4SemiSealed System)
A. Check for Gasket i n Pressure Cap.
B. Check for Leaks
-
Hoses, Clamps, Over-
f l o w Bottle, Filler Neck Nipple.
C. Check for Obstructions or Plugging i n
Hose Between Radiator and Bottle.
REPAIR OR
REPLACE DEFECTS
PRESSURE CHECK SYSTEM
LEAKS
Install Pressure Cap Checker o n
Radiator Filler Neck and Pressurize
+
System t o Rated Pressure.
R EPAl R
I f System Does n o t H o l d Pressure,
Look for Leak Location.
131 7