Well lucky you i am a certified volvo tech,mostly all coolant temp sensors are located in the general area of the thermostat housing if not directly in it or on top of it,locate your thermostat and you'll find your sensors,also note that there is two one for the computer and one for the guage,good luck,should be easy from hear on in peace....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
SOURCE: S40 2.0T cat sensor keeps blowing
The car uses a lot of fuel, when the garage replaced the sensor the car used a lot less fuel but the sensor failed within a day and the engine management light came back on again. It's after the cat sensor, the one at the back. i don't know what type of sensor it is but it has a 4 pin white plug and is about 1meter long (part no is 308643308 ntk a4f ) if it helps. I just want to know if it is possible that the exhaust can damage the sensor if it is loose? The garage keeps replacing the part but it does not look like they are trying to fix the problem!! i will fix the exhaust first and try a new sensor again.
Thanks vagman54
SOURCE: engine management light volvo s40 problem
The best thing is to go to your local Volvo maintenance shop or Volvo experts to find out whats the problem..usually the coomon ones I think is the programs inside its ECU unit..you try this..ask the volvo experts to reset the ECU and lets see..if problem arise then it is no doubt you might need the sensor..hope this help..
SOURCE: The ECT SENSOR of my S40 VOLVO is not working well
Is the temperature reading low? If so, your thermostat is stuck open and needs to be replaced. Or is there another problem?
Bret
RepairPal.com
SOURCE: how to change indicator bulb
The front indicators are held in by a phillips screw which can be seen if you look down from the top of the lamp, it only needs to be loosened a turn, there's a plastic tag as a safety clip which needs to be pressed towards the headlamp at the same time as you pull the indicator lamp forwards. Once the lamp is out the bulb holder twists 1/4 turn to release.
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
To much too type, there is a lot of details to this job, the best thing to do is to get a book on this particular vehicle, its about $20.00 at a auto parts store. This will give you all the directions, the do's and don't-- locations and torque specs. ect....
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