Buick Regal: Description and Operation
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Cooling Fan Description and Operation
System Overview
The engine cooling fan system consists of 2 electric cooling fans and 3 fan
relays. The cooling fan relays
are arranged in a series/parallel (S/P) configuration. This allows the engin
Cooling System Description and Operation
Engine Coolant Indicators
The instrument panel cluster (IPC) shows the engine temperature on the
temperature gauge. The
value is sent on the data communication line from engine control module (EC
Firing Order and Cylinder Identification
NOTE: This information is intended as a quick reference for firing
order and
cylinder identification only. The information provided covers many
vehicles and may include some information that does not
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Audible Warnings Description and Operation
The audible warnings alert the driver of a system concern or a critical
vehicle condition. If equipped
with an serial data communicating audio amplifier, the audio amplifier generates
the audible warnings
through the speakers. If not equipped with an audio amplifier, the radio
generates the audib
Heated Oxygen and Oxygen Sensor Caution
CAUTION: Do not remove the pigtail from either the heated oxygen sensor
(HO2S) or
the oxygen sensor (O2S). Removing the pigtail or the connector will
affect sensor operation.
Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the inline
electrical connector and the louvered end free of
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