Pontiac FIREBIRD 1972 Service Manual page 634

6A- 14
1972 PONTIAC SERVICE MANUAL
(above zero readings) indicate solutions with-
THERMOSTAT
out enough anti-fieeze concentration to provide
adequate rust protection.
REMOVE AND REPLACE
1. Drain radiator level to below thermostat and remove
A little experience will enable you to obtain quickly the
water outlet assembly from cylinder head (6 cyl.) or
best contrast between the light and dark portions of the
intake manifold (8 cyl.).
field of view. Tilt the instrument toward the light source
until best results are obtained.
NOTE:
On some models it will be necessary to
remove the rear generator brace.
If the "edge of the shadow" is not sharp, the measuring
surfaces were not sufficiently well cleaned or dried. Wipe
2. Remove thermostat. Unless obviously defective, test
dry as explained above and make new test.
thermostat as follows before replacing with new one:
- - -
Fig. 6A-18 Radiator Mountmgs
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G S e r ~ e s