Coolant Temperature Sensor/Switch (For Computer): Service and Repair
ENGINE TEMPERATURE SENSOR
Removal
Engine temperature sensor, 5-cylinder
Jack up the car.
Remove protection cover from under engine.
Drain the coolant.
Lower the car.
Release coolant hose from thermostat housing using pliers.
Remove thermostat housing.
Remove sensor.
where is the engine coolant sensor in a v70 99 - 02daadd.jpgrc="/uploads/images/02daadd.jpg" alt="02daadd.jpg" class="h_mi" />
Engine temperature sensor, 6-cylinder
Jack up the car.
Remove protection cover from under engine.
Drain the coolant.
Lower the car.
Loosen oil reservoir for servo pump.
Remove coolant reservoir and put it to one side.
Remove screws and outer/upper timing-gear casing.
Remove screws and wire channel.
Disconnect connector.
Remove 4 screws and thermostat housing.
Remove sensor and wires.
Installation
Engine temperature sensor, 6-cylinder
Install thermostat housing sensor.
Position wires in slot on thermostat housing.
Note! The white marks should be positioned in lower opening of slot, from underneath.
Position gasket on thermostat housing correctly and install thermostat housing using two of the screws.
Position thermostat housing correctly and tighten the four screws.
Position wire channel correctly and position wire in channel.
Tighten screw on wire channel.
Connect the connector.
Install outer/upper timing-gear casing.
Install coolant reservoir.
Install oil reservoir for servo pump.
Follow-on work, 6-cylinder
Fill up coolant.
Warm the engine until the thermostat opens.
Switch engine oft and check the level. Re-fill if necessary.
Check for leaks.
Check in VADIS vehicle communication (read-out of parameter values), for current engine system, that the engine temperature shown appears
correct.
Engine temperature sensor, 5-cylinder
Install in reverse order.
Follow-on work, 5-cylinder
Fill up coolant.
Warm the engine until the thermostat opens.
Switch engine off and check the level. Re-fill if necessary.
Check for leaks.
Check in VADIS vehicle communication (read-out of parameter values), for current engine system, that the engine temperature shown appears
correct.
If you're looking for the fluid level sensor, it is located under the reservoir
SOURCE: 2001 volvo s440 1.9t
Volvo Radiator, Thermostat and Sensors
Your cooling
system's temperature controls include all coolant temperature sensors,
Volvo thermostat, Volvo radiator or expansion tank cap, cooling fan(s)
and fan clutch (if equipped). These cooling system parts function
primarily independent of the engine but control the engine either
through cooling or by sending control signals to your Volvo's
electronic systems.
The Volvo thermostat is a spring-loaded
valve that opens and closes based on the temperature of the coolant
flowing through it. A high temperature reading followed by a drop to
normal temperature (or a continuously low temperature) is a common
first sign of a sticking Volvo thermostat. However, many other
conditions may cause these symptoms, so you need to know how to
eliminate each possibility.
The Volvo radiator or expansion
tank cap is also a spring-loaded valve reacting to system pressure. It
serves to maintain proper system coolant level at predetermined
pressures. It must always be replaced with an exact replacement cap
with the same pressure setting. Never use other caps except for
short-term emergencies!
A belt-driven fan blade for pulling
air through the Volvo radiator is usually on the Volvo water pump
pulley and should have a fan clutch to control it. The fan clutch
allows the fan to turn with the belt at low engine speed and
"free-wheel" at higher speeds. A bad fan clutch either doesn't allow
the fan to spin at low speed (overheating in traffic) or doesn't allow
it to free-wheel at high speed (potential overheating on highway or
reduced gas mileage).
An electric fan can be either by
itself (usually front-wheel drive) or auxiliary (used with a mechanical
fan). Both types are controlled via a temperature sensor - in the Volvo
radiator or upper Volvo radiator hose or on the Volvo thermostat or
Volvo water pump housing. This sensor is usually an on/off type switch
with a fixed temperature setting. (Some vehicles may have 2-3 settings
for multi-speed fans.) This sensor is commonly called an "auxilliary
fan switch".
Other common temperature sensors are: 1) gauge
sender (variable output); 2) warning light sender (on/off type); 3)
lambda and/or fuel injection sensor(s) (variable to control fuel
injection settings); 4) thermo-time switch (cold start valve control).
Your Volvo may have other sensors as well.
Temperature
control is critical to both performance and emission control.
Unfortunately, this system is the most difficult to troubleshoot
without proper equipment and diagrams. It's even more difficult with
computers that adjust timing, idle speed, vacuum and fuel delivery
automatically to make up for potentially faulty temperature sensor
signals.
Maintenance of your cooling system sensors is
virtually impossible since there's nothing really to "maintain".
Keeping them clean both internally (coolant replacement) and externally
(engine cleaning) is the best way to ensure trouble-free driving.
Checking and replacing all parts at the factory-recommended time or
mileage limits helps as well
SOURCE: Coolant temp sensor
it is located where the upper radiator hose enters the thermostat housing
SOURCE: 99 volvo v70 02 sensor....
Either get a OBD2 electronic reader and clear codes or try disconnecting battery for five minutes to reset. Good luck.
SOURCE: on a 2004 volvo s-40 with turbo where is the
Hi!!
Thermostat location in 5 cil. engines, temp sensor is located just right or upper arrow in picture. I've included a picture of temp sensor and installation instruccions.
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
Fig. Coolant temperature sensor illustrated
Coolant temperature sensor illustrated
To install:
If helpful, click below, good luck.
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