Gmc 2007 Sierra User Manual download pdf (Page 453)

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101

Turn Signals When Towing a Trailer

The arrows on your instrument panel will

ﬂash whenever you signal a turn or lane change.

Properly hooked up, the trailer lamps will also

ﬂash, telling other drivers you’re about to

turn, change lanes or stop.

When towing a trailer, the arrows on your

instrument panel will ﬂash for turns even if the

bulbs on the trailer are burned out. Thus, you may

think drivers behind you are seeing your signal

when they are not. It’s important to check

occasionally to be sure the trailer bulbs are still

working.

Driving On Grades

Reduce speed and shift to a lower gear before

you start down a long or steep downgrade. If you

don’t shift down, you might have to use your

brakes so much that they would get hot and no

longer work well.

If you have an automatic transmission, you can

tow in DRIVE (D). You may want to shift the

transmission to lower gear selection if the

transmission shifts too often (e.g., under heavy

loads and/or hilly conditions).

You may also want to activate the tow/haul mode

if the transmission shifts too often. See Tow/Haul

Mode Light on page 264.

If you have a 5-speed manual transmission and

you are towing a trailer, it’s better not to use

FIFTH (5) gear. Just drive in FOURTH (4) gear

(or, as you need to, a lower gear).

When towing at high altitude on steep uphill

grades, consider the following: Engine coolant at

or near sea level will boil at a lower temperature

than at higher altitudes. If you turn your engine off

immediately after towing at high altitude on

steep uphill grades, your vehicle may show signs

similar to engine overheating. To avoid this, let

the engine run while parked, preferably on

level ground, with the automatic transmission in

PARK (P) for a few minutes before turning

the engine off. For manual transmissions, let the

engine run while parked, preferably on level

ground, with the transmission out of gear and the

parking brake applied, for a few minutes before

turning the engine off. If you do get the overheat

warning, see Engine Overheating on page 505.

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Gmc 2007 Sierra User Manual Page 453

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