Verifying an Impeller Failure ! 273
Chapter 19: Monitoring the Cooling System
Verifying an Impeller Failure
Action To verify an impeller failure, follow these steps:
1. Place your hand near the exhaust in the router chassis to determine whether
the impellers are pushing air out. If you do not feel much air or no air at all, the
impeller is not working.
2. If the impeller fails, replace it as described in the appropriate hardware guide.
The impellers are hot-removable and hot-insertable. You can replace the fans
without powering down the router.
Replacing a Cooling System Component
The cooling system components are hot-removable and hot-insertable. You can
remove or replace a cooling system component without powering down the system
and disrupting routing functions. However, you should not operate a router for more
than a few minutes without the air filter in place to avoid dust, particles, or other
material being sucked into the router chassis.
Action To replace a cooling system component, see the appropriate router hardware guide.
NOTE: The cooling system components (fans and impellers) do not have serial
numbers. Therefore, you will not see a serial number listed in the hardware
inventory or a serial number ID label on the component.
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