RW> TW> IF your FAN was not responding the the engine block temperature
RW> TW> switch you had ANOTHER problem totally indepebndent to what the AC
RW> TW> system was reporting.

RW>I'll use the 1998 Service Manual to diagnose and repair what their testing
RW>reveals...it specifically applies to the 1998 product rather than some
RW>generic unknown source.

From the service manual of a 1998 5.7L F-car (Camaro/Firebird) here is
the descriptio of the cooling fan controls

Engine Cooling Fan Description - Electric
The electric cooling fans are used to cool engine coolant flowing
through the radiator. The fans are also used to cool the refrigerant
flowing through the A/C condenser.

The electric cooling fans are controlled by the PCM. The PCM controls
the ground path for the three cooling fan relays. The relays are used to
control the high current flow to power the cooling fan motors. Both fans
operate together. When minimum cooling is required, the PCM energizes
cooling fan relay #1 and both fans operate at low speed, since the fans
are connected in series through cooling fan relay #3. Cooling fan relay
#2 is open (not energized) and is not used for low speed operation of
the fans. When maximum cooling is required, the PCM energizes all three
cooling fan relays. The left fan is still powered through cooling fan
relay #1, but is now grounded through cooling fan relay #3. The right
fan is now powered directly through cooling fan relay #2 and both fans
operated at high speed.

The PCM will also enable the cooling fans after the ignition is turned
off. When the engine coolant temperature exceeds 113øC (235øF) and the
ignition is turned off, the cooling fans will be enabled on low speed
for 150 seconds.

Cooling Fans
The cooling fans are controlled by the PCM based on the
following inputs:

The A/C system.
The Engine Coolant Temperature (ECT) sensor.
The Vehicle Speed Sensor (VSS).

Looks like SEPERATE Functions to me controled by a combination of
Sensors and Relays.
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