Thermostat; Cooling Fan Clutch - Suzuki 2000 Grand Vitara SQ625 Service Manual

6B-4 ENGINE COOLING
[G16 & J20 engines]
[H25 engine]

THERMOSTAT

valve begins to open
Temp. at which valve
becomes fully open
1. Air bleed valve
2. Thermostat seal
3. Bypass valve

COOLING FAN CLUTCH

Fluid is enclosed in the cooling fan clutch and at its center front,
there is a bimetal whose thermal reaction and the engine speed
control the cooling fan speed.
The relation between the temperature detected by the fan clutch
and operation of the fan clutch is as follows.
While the fan clutch detects a temperature lower than 50_C, it re-
mains OFF and the fan revolution speed is constant (400 to
900 r/min. (rpm) : J20 and H25 engines, 600 to 1,300 r/min.(rpm)
: G16 engine) regardless of the engine speed. As the temperature
reaches 50_C to 70_C, the fan clutch turns ON gradually and the
fan revolution speed increases.
A temperature exceeding 70_C causes the fan clutch to turn ON
and the fan revolution speed to increase in proportion with the en-
gine speed.
Once the engine speed exceeds 4,000 r/min.(rpm), however, the
fan revolution speed becomes constant (2,350 to 2,650 r/min.(rpm)
: J20 and H25 engines, 2,800 to 3,100 r/min.(rpm) : G16 engine).
CAUTION:
Do not disassemble fan clutch.
1. Cooling fan
2. Fan clutch
3. Bimetal
Temp. at which
Valve lift
J20 and
H25 engines : 82 + 2_C (179 + 3.6_F)
G16 engine : 88 + 2_C (190 + 3.6_F)
J20 and
H25 engines: 95_C (203_F)
G16 engine : 100_C (212_F)
J20 and
H25 engines: More than
: 8 mm at 95_C (203_F)
G16 engine : More than
: 8 mm at 100_C
: (212_F)