Chevrolet 2003 Blazer Owner's Manual page 253

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Then, during the first 500 miles (800 km) that you
tow a trailer, don't drive over 50 mph (80 km/h)
and don't make starts at full throttle. This helps your
engine and other parts of your vehicle wear in at
the heavier loads.
If you have an automatic transmission, you can tow
in DRIVE (D). You may want to shift the
transmission to THIRD (3) or, if necessary, a lower
gear selection if the transmission shifts too often
(e.g., under heavy loads and/or hilly conditions). If
you have a manual transmission and you are
towing a trailer, it's better not to use the highest
gear. See Tow/Haul Mode Light
on
page 3-37.
Three important considerations have to do with weight:
the weight of the trailer,
the weight of the trailer tongue
and the weight on your vehicle's tires.
Tow/Haul Mode
Your vehicle may be equipped with a tow/haul feature.
The tow/haul mode is a feature that assists when
pulling a heavy trailer. The purpose of the tow/haul
mode is:
Reduce the frequency of shifts when pulling a
heavy trailer,
provide the same shift feel when pulling a heavy
reduce the need to change throttle position when
This feature is turned on or off by pressing a button on
the floor console or the shift knob. When the feature
is on, a light located on the instrument panel cluster will
illuminate to indicate that the tow/haul mode has
been selected.
trailer as when the vehicle is unloaded, and
pulling a heavy trailer.
See Tow/Haul Mode Light on page 3-37. The tow/haul
mode is automatically turned off each time the vehicle is
started.
The tow/haul mode is most effective when the vehicle
and trailer combined weight is at least 75% of the Gross
Combination Weight Rating (GCWR).
The tow/haul mode for hauling a heavy trailer is most
useful under the following conditions:
When driving through hilly terrain at speeds below
when driving in low speed or stop and go traffic
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when driving in parking lots.
55 mph (88 km/h),
below 55 mph (88 km/h), and
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