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Drain coolant enough to at least empty pressure at top radiator hose. Save coolant in a container. The thermostat housing is located on top of the engine, of passenger side where the top radiator hose is clamped. Use a T-40 torx drive socket to remove the two bolts, be careful you don't damage threads. Remove the housing then remove old thermostat. I recommend replacing coolant temp sensor at same time, it is located underneath thermostat and is threaded into the thermostat housing. Both parts together will cost about $80-85 from your Volvo dealer. (Volvo Thermostat part # 271664, Volvo Coolant Temp. Sensor/IAT Sensor part # 9125463)
Use sealant (Water Pump & Thermostat Housing RTV Silicone, cost around $3) around match surfaces of housing with new thermostat in place. Carefully seat the housing and carefully thread the mounting bolts to seat the housing. When a little sealant escapes around the edges and bolts are tight STOP, do NOT over tighten. It doesn't have to be torqued on there the sealant will heal around the surfaces and bond the mount in place.
Reconnect sensor and reconnect top hose.
If you are going to drain the system, remove radiator drain plug it's located there at the passenger side of radiator and refill system.
Test for leaks Your done.
Tools needed:
Flat blade screwdriver (to remove hose clamps)
Socket wrench
T-40 torx drive socket
19mm open end wrench (to remove Coolant Temp. Sensor)
Drain Pan (to catch spilling coolant)
50/50 water/coolant (optional, if you are going to change coolant)
What else can I help you with?
Volvo S40 common problems?
Thermostat and thermostat sensor (ect) bad
How do you remove drivers headrest Volvo s40?
How do you remove the inside driver's door panel on a 2000 Volvo S40?
Is there a fuel shutoff switch on a 2006 Volvo S40 and if so where is it located?
Where. Is the fuel shutoff switch on a 2000 s40 Volvo
How do you get the alarm fuse out of a 2000 Volvo s40?
With your fingers
What is spark plug gap for 2000 Volvo s40?
.30
Which Tires for Volvo S40?
Which Tires for volvo S40?
What cars what do 0-60 in 6.3 seconds?
My 2000 Volvo s40 does
Where is the coolant temperature sensor located on a 2003 volvo s40?
Next to the thermostat. you will see it when you remove the hose
How do you replace a wheel bearing on a 2007 Volvo s40?
To replace a wheel bearing on a 2007 Volvo S40 you need to remove the caliper bolts first and then extract the car's rotor. Then you must put the new bearing on the knuckle.
What is Code 128 for Volvo S40?
I'm not sure what you're asking, but if you mean that you are getting an OBD-II diagnostic code of P0128 from your Volvo S40, that code corresponds to a problem with coolant temperature. On a first generation Volvo s40 (99-04), this usually means that the thermostat or electronic coolant temperature sensor are malfuctioning or have failed.
How do you add coolant on a Volvo s40?
Where is the radiator cap on a 2001 Volvo s40?
Where is the cigarette lighter fuse in Volvo s40 2000?
Passenger compartment, component 2
