Two-Stage Thermostat - Mazda 323 Workshop Manual Supplement

E
OUTlANE
TWO-STAGE THERMOSTAT (BP DOHC TURBO)
MAIN VALVE
SINGLE-STAGE THERMOSTAT
(AMBIENT fEMP. -20% (4*f))
NTRANCE PORT TEMP
GINE EXIT PORT TEMP.
-
100 km/h
60 kndh
(63 mph) ~~~~~ (38 mph)
TWO-STAGE THERMOSTAT
A sub-valve is incorporated in the thermostat to stabilize the coolant temperature in the engine, to improve
cold weather performance, and to reduce heater output temperature fluctuations as noted in the diagram.
Operation
Stage 1
During cold weather operation, 83.5*C [182°F]-86.50C [t 88OF] only the sub-valve opens to control the
engine coolant temperature.
Stage 2
During normal operation, 86.5OC (1 88°F)-89.50C (I 93OF) the main valve opens to permit increased coul-
an: flow through the radiator.
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