Winterfronts - Mack Granite GU Series Operator's Handbook Manual

178 OPERATION

Winterfronts

A winterfront, although not recommended, may be used during cold weather,
with sustained temperatures below -25°C (-13°F), to aid the engine in reaching
and maintaining engine coolant temperatures within the normal operating
range.
CAUTION
Use a winterfront designed for the specific chassis. Restricted air flow through the
charge air cooler can cause higher exhaust temperatures, power loss, excessive fan
usage, reduced fuel economy and possible engine or charge air cooler damage.
The use of any other type of device, such as a radiator cover, cardboard or similar
material, is not approved by Mack Trucks, Inc.
Note: The minimum operating temperature is 77°C (170°F).
If a winterfront is used, a MACK-approved exhaust pyrometer must also be
installed and closely monitored while the engine is in operation.
CAUTION
DO NOT exceed the maximum exhaust temperature listed on the pyrometer decal.
To reduce exhaust temperature, open the winterfront, downshift or reduce engine
power.