Volvo 780 Owner's Manual page 47

1987 Volvo 780
Selecting position N when standing still with engine running for prolonged periods of time will avoid
overheating transmission fluid.
WARNING!
Always place gear selector securely in Park and apply parking brake before leaving vehicle. Never
leave car unattended with engine running.
The following "Special Tips" apply to cars with automatic transmission
For steep hills and when driving for prolonged periods at low speeds position 1 should be selected.
Avoid, however, repeated changes since this can cause overheating of the transmission oil. For driving
on mountain roads with long persistent uphill gradients, select position 2.
When negotiating long, steep downhill slopes, position 1 should be selected and position 2 for less
severe inclines, in order to obtain the best possible engine braking effect.
Do not hold the car stationary on an incline by using the accelerator pedal; instead, engage the parking
brake. This prevents unnessary heating of the transmission oil.
When towing, disengage the 4th gear (the indicator light on the instrument panel goes on).
pg. 47 Points to remember
Cooling system
The risk for overheating is greatest, especially in hot weather, when:
Towing a trailer up steep inclines for prolonged periods at full throttle and low engine rpm.
Idling for prolonged periods while the air conditioning system is in operation.
Stopping the engine suddenly after high speed driving (so-called "after-boiling" can occur).
To avoid overheating, the following rules should be followed:
Reduce speed and downshift when towing trailer up long, steep inclines. The risk of overheating can
be reduced by switching off the air conditioning system for a short time.
Do not let the engine idle unnecessarily for prolonged periods.
Do not stop the engine immediately after high-speed driving, but instead, allow the engine to idle for
1/2-1 minute before switching off.
When the risk of overheating is imminent or in the event of overheating, (the temperature gauge goes
repeatedly into, or stays continually in, the red section) the following precautions should be taken:
Switch off the air conditioning system.
Stop the car and put the gear lever into position N.
Do not stop the engine!
Increase the engine speed to approx. 2000 rpm (twice idling speed).
Electrical system
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