Page 928 - 2021 Sierra Catalog

➀18-3670D
18-3670 THERMOSTAT KIT Fits: 2.5L & 3.0L (1982-88)
— CONTAINS —
18-3676 THERMOSTAT KIT 140°
For: 7.4L (1994-98), 8.2L (1998)
— CONTAINS —
➀18-3676D
➀18-3677D
18-3677 THERMOSTAT KIT
— CONTAINS —
160°
Part # O.E.# Desc.
18-7170 3852071 O-Ring
18-0398 3852111 Thermostat Gasket
Part # O.E.# Desc.
— 3856961 Thermostat
18-3558 982554 Thermostat
Part # O.E.# Desc.
HP Year
HP Year
18-2858 314809 Thermostat Housing Cover Gasket
18-7170 3852071 O-Ring
4.3L 1994-97
5.8L 1994-97
18-0398 3852111 Thermostat Gasket
4.3 HO 1991-97
5.8 (EFI) 1993-97
18-0929 313416 Thermostat Gasket
— 3853983 Thermostat
5.0 L 1994-97
THERMOSTAT AND THERMOSTAT KIT APPLICATION
Model
Years
Thermostat
Thermostat Kit
Model
Years
Thermostat
Thermostat Kit
90
1970
18-3554
18-3653
250
1970-73
18-3554
18-3653
100
1972-73
18-3554
18-3653
250
1979
18-3554
18-3653
120
1969-80
18-3554
18-3653 ➀
260
1979-81
18-3554
18-3653
120
1980-81
18-3558
18-3670 ➁
262
1989
18-3554
—
140
1973-80
18-3554
18-3653 ➀
305
1977-82
18-3554
18-3653
140
1980-81
18-3558
18-3670 ➁
350
1977-82
18-3554
18-3653
155
1969-72
18-3554
18-3653
350
1989
18-3554
—
165
1972-76
18-3554
18-3653
351
1992
18-3554
—
170
1974
18-3554
18-3653
454
1977-82
18-3554
18-3653
175
1975-77
18-3554
18-3653
460
1989
18-3554
—
185
1978-80
18-3554
18-3653
2.5L
1982-88
18-3558
18-3670
190
1974-77
18-3554
18-3653
3.0L
1982-88
18-3558
18-3670
200
1979-81
18-3554
18-3653
3.8L
1981-85
18-3554
18-3653
210
1969-72
18-3554
18-3653
4.3L
1985-86
18-3554
18-3653
215
1971
18-3554
18-3653
4.3L
1989-92
18-3554
—
225
1971
18-3554
18-3653
5.0L
1982-88
18-3554
18-3653
230
1979-81
18-3554
18-3653
5.0L
1989-92
18-3554
—
235
1971
18-3554
18-3653
5.7L
1982-88
18-3554
18-3653
235
1975-77
18-3554
18-3653
5.7L
1989
18-3554
—
240
1978
18-3554
18-3653
5.8L
1989-92
18-3554
—
245
1972-75
18-3554
18-3653
7.5L
1988
18-3554
18-3653
➀ 1980 Models with "C" suffix only ➁ 1980 Models with "C1" suffix only
SINGLE DIAMETER HOSE
4 3/4"
18-70021 MOLDED HOSE 3/4" ID
18-70704 MOLDED HOSE 1 1/4" ID
5"
5"
18-70924 MOLDED HOSE 1 3/4" ID
12 1/2"
18-71218 MOLDED HOSE 1" ID
12 3/4"
18-71337 MOLDED HOSE 1 3/4" ID
STRAIGHT HOSE
18-75100 MOLDED HOSE Straight 48"
1" ID
18-75125 MOLDED HOSE Straight 48"
1 1/4" ID
➀ Items ending in "D" are Display Packaged - Regular number is Non-Display
910
I/O — OMC STERNDRIVE/COBRA - Cooling System