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ENGINE APPLICATION MANUAL GM Powertrain
Gasoline 4.3L V6 90 Degree Revised: 08/15/2000
File: c:\data\manuales\v6-truck\am43v6#3.doc
Contact:Luis Nespolo - (248) 857-1558 Printed: 8/15/00
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3.2.4.4 Coolant and Heater Subsystem Descriptions
3.2.4.4.1 Coolant Inlet- Water Pump Inlet Restriction
Typical Diameter: 60 mm +/- 0.3 mm.
The suction at the water pump inlet should not exceed approximately 1.0" HG (-1.0" HG
pressure) when run at 3500 RPM without a pressure cap. Exceeding this suction could
cause the lower radiator hose to collapse if the system loses cap pressure.
3.2.4.4.2 Coolant Outlet-
Typical Diameter: 46.2 mm +/- 0.3 mm.
3.2.4.4.3 Heater Feed-
Typical Diameter: 15.9 mm +/- 0.3 mm or 19.05 mm +/- 0.3 mm
3.2.4.4.4 Heater Return
Typical Diameter: 15.9 mm +/- 0.3 mm or 19.05 mm +/- 0.3 mm
3.2.4.4.5 Coolant Hose Material
GMPT requires hose material meeting GM specification 6140m, 6250m, 6278m, or
6149m (hose material specifications vary by the severity of the environment they will be
subjected to).
Reference radiator and heater hose dimensional specifications listed on drwg. #
12552514. Suggested lubricant for ease of hose assembly to inlet nipple is GM
9985406
3.2.4.4.6 Hose Clamps
GMPT requires the use of constant tension clamps for all hose connections.
Reference dimensional information on hose clamp drwg. # 11516215 and equivalents.
3.2.4.4.7 Thermostat
- start to open temperature- 170°F
- full open temperature- 190°F