Hombre XS Space Cab L4-2.2L CPC (1997)
Radiator Cooling Fan Motor: Testing and Inspection
Engine Overheating
CHECK FOR ENGINE OVERHEATING AS FOLLOWS:
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Start with a cool engine to ensure complete fan clutch disengagement.
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If the fan/fan clutch assembly free - wheels with no drag (revolves more than five times when spun by hand), replace the fan clutch. Testing a fan
clutch by holding the small hub with one hand while rotating the aluminum housing in a clockwise/counterclockwise motion will cause the clutch
to free wheel. This is a normal condition when operated this way. It is not a test to determine replacement.
WARNING: Do not use or attempt to repair a damaged cooling fan assembly. Replace damaged fans with new assemblies. An
unbalanced cooling fan could fly apart causing personae injury and property damage.
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Position a thermometer between the radiator and the fan blades. Do this by inserting the thermometer sensor through one of the existing holes in
the fan shroud, or by placing it between the radiator and the shroud.
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With the thermometer in position, cover the radiator grille enough to induce a high engine temperature. Start the engine. Turn the air conditioning
on. Run the engine at 2,000 RPM.
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It takes approximately 5 - 10 minutes for the temperature to become high enough to allow engagement of the fan clutch. This will be indicated by
an increased in roar in the fan air noise. There also will be a drop in the temperature reading, from 3 - 15°C, (5 - 15°F).
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If the clutch does not engage between 65 - 90°C (150 - 195°F), the fan clutch should be replaced. Be sure the fan clutch is disengaged at the start
of the test.
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If the fan noise level is constantly high from the start of the test to 88°C (190°F), without any noticeable noise level increase or drop in
temperature, the fan clutch must be replaced. To prevent engine overheating, discontinue the test, past a thermometer reading of 88°C (190°F).
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As soon as the clutch engages, remove the radiator grille cover. Next turn off the air conditioning. This will assist in engine cooling. Run the
engine at approximately 1,500 RPM.
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After several minutes, the fan clutch should disengage. There will be a reduction in fan speed with decreased fan noise. If the fan clutch fails to
function as described, you must replace the fan clutch.
