engine overheat INFINITI QX70 2016 Towing Guide

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equipped) carefully. At the first sign of overheating, pull to the side of the road. See IF YOUR ENGINE
OVERHEATS later in this section for more information.

HILLS – DOWNGRADES
WARNING- While going downhill, the weight of the trailer pushing on the tow vehicle may
decrease overall stability, and may deteriorate overall handling characteristics. The vehicle may
handle unpredictably which could cause a loss of vehicle control resulting in an accident, property
damage, serious injury or death. Therefore, to maintain adequate control, reduce your speed and
shift to a lower gear and apply the braking in short bursts. If your vehicle is equipped with Tow
Mode, see your vehicle owner’s manual for information about the use of this function.

WARNING- Avoid long or repeated use of the brakes when descending a hill, as this reduces
their effectiveness and could cause overheating which could result in damage to your brake
components or unable to slow to a safe speed. Shifting to a lower gear instead provides “engine
braking” and reduces the need to brake as frequently.

HIGH-ALTITUDE PERFORMANCE
An engine will lose about 4% of its performance for every 1,000 feet above sea level that you travel.
If you will be towing in high altitudes, it is a good idea to allow more time than usual due to the
engine’s reduced performance.

INTELLIGENT CRUISE CONTROL

WARNING- In order to maintain a safe distance to the vehicle ahead to avoid the possibility of
accidents, property damage, serious injury or death. Infiniti recommends not to use the Intelligent
Cruise control (ICC) system while towing a trailer or other vehicle. In certain road conditions when
your vehicle is towing, the ICC sensor may not detect a vehicle ahead. If the ICC sensor cannot
detect the reflector on the vehicle ahead, the ICC system may not maintain the selected distance
which could cause an accident, property damage, or death.

BLIND SPOT INTERVENTION
WARNING- Do not use the Blind Spot Intervention system (BSI) when towing a trailer. The BSI
system cannot function properly when objects are obstructing the radar sensors which could cause
an accident, property damage, or death.

TOW MODE (IF SO EQUIPPED)
Tow Mode is recommended when towing a heavy trailer or hauling a heavy load, in stop-and-go
traffic, rolling terrain, or a busy parking lot. Driving the vehicle in Tow Mode may affect fuel

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economy and transmission/engine driving characteristics. See your vehicle owner’s manual for
additional information about Tow Mode.

IF YOUR ENGINE OVERHEATS
A moderate increase in engine operating temperature is normal when towing a trailer. If, however,
the coolant temperature gauge reading is abnormally high, or if you are experiencing a significant
loss of power, or if you hear unusual engine noises,* the engine may be overheating and you
should immediately take the following steps:

1. Pull your vehicle safely over to the side of the road, out of traffic. Apply the parking brake
and move the gearshift lever to NEUTRAL (manual) or PARK (automatic). DO NOT STOP THE
ENGINE.

2. Turn off the air conditioning and, after opening all the windows, turn the heater on to
maximum hot and the fan to its highest speed, and exit the vehicle. The heater core in your
vehicle is just like a miniature engine radiator and will provide an extra cooling surface to
help reduce engine temperature.

*
See your vehicle owner’s manual for additional indications that your vehicle may be overheating.

3. If the temperature does not drop or continues to increase, stop the engine immediately.

4. Being cautious of traffic, step out of the vehicle and, from a safe distance, look for steam
underneath the engine. If you see steam or leaking coolant, stand clear to avoid being
burned and shut off your engine immediately and allow it to cool. If there is no steam, open
the hood.
WARNING -Never remove the radiator cap when the radiator is hot. If the cap is removed under
these conditions, pressurized hot water/coolant may spurt out, possibly causing serious injury.

5. As soon as the engine has cooled to its normal operating temperature, visually inspect the
drive belts for damage or looseness. A loose belt reduces water pump efficiency. Be careful
to keep your hands, hair, jewelry, and clothing clear of the running drive belt and other
moving parts when inspecting the engine and radiator. Also check to see if the cooling fan is
running, and inspect the water pump, radiator, and radiator hoses for leaks. Keep in mind,
too, that if your vehicle is equipped with an electric fan motor, it may start without warning
any time the coolant temperature is high. If you find leaking coolant, a loose or missing drive
belt, or an inoperable fan, turn off the engine immediately.

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6. If no leaks are apparent and all other components appear to be operating properly with the
engine cooled to its normal operating temperature; check the coolant level in the reservoir
tank with the engine running. Add coolant to the reservoir tank if needed. At this point, if
repairs are required, go to the nearest Infiniti retailer. See the IN CASE OF EMERGENCY
section of your vehicle owner’s manual for additional information on overheating.

NOTE – All Infiniti vehicles have an engine protection mode which helps reduce the chance of
engine damage if the engine coolant reaches a specified temperature.



NOTES












Passenger Vehicles – Infiniti does not recommend trailer towing with Q50, Q70, or Q70 (HEV)
vehicles.

Cross-Over Vehicles – Infiniti
does not recommend trailer towing with QX50, or the QX70 2WD vehicles.

Other Recommendations and Information – Towing performance and speed are affected by vehicle
payload, tow weight, road grades, and weather conditions, including high temperatures. See your
vehicle owner’s manual for details.





1 Maximum Trailer Weight values are calculated assuming a base vehicle with
driver and any options required, to achieve the rating. Additional
passengers, cargo and/or optional equipment will add weight to the vehicle
and reduce your vehicle’s maximum towing capacity and trailer tongue
load.

2 In general, a weight-distributing hitch system should be used when towing
over 5,000 lbs.

3 Most states require a separate braking system on trailers with a loaded
weight above a specific amount. Check local ordinances. 7-pin connector
trailer wire harnesses are required for use with trailer brakes (available
separately).