Volvo VNL Operator's Manual page 83

78 Instruments and Controls
1 — Engine Preheat Telltale
The amber telltale will light up when the
intake manifold preheater is operating. The
heater is used for better cold starts. Opera-
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tion time of the heater can vary in several
steps from 0 to 50 seconds depending on
coolant temperature and outside air temper-
ature. On cold mornings, the preheater will
be on for the maximum 50 seconds. When
the ignition key has been turned to the pre-
heat position, the preheater coils in the
intake manifold are activated to warm the
intake air. Once the engine is started, the
preheater may be re-engaged to assist in a
quicker engine warm-up. See page 249 for
information on using the preheater.