Usually in a removable housing at the engine end of the upper radiator hose
.040
Goto Brickboard.com
Probably - remove distributor cap and look
in the fuel tank? just a wild guess.
In the 1989 Volvo 740 GL with a Bosch system it is located just above the steering column on the dash.
In the centre console behind the ash tray. AH
i have a 1989 740 and mine is located on under the hood it the green 1 on the side next to the air filter
in the distributor in the rear of the engine. sometimes known as a hall sensor
Right above the oil pan in the center of the block.
On a 1989 Volvo 740, the coolant temperature sensor is typically located on the engine block near the thermostat housing. It is usually positioned on the driver's side of the engine, close to the intake manifold, and may have a single or dual wire connector. To access it, you may need to remove any obstructing components, such as the air intake or engine cover.
The Chiltons/Haynes 72300 has the vacuum circuits divided into the emissions, Fuel and brakes sections of their manual covering each vacuum hose.
under the left hand bumper