Why does 2000 s40 volvo turbo runs hot and the fan stays on after shut off

Have you had the fault codes read? If not do that first.

Burning oil may be the cause of the rest. Bad PCV system? Worn rings? Bad valve guide seals? Fully describe how and when it burns oil.

the temperature sender unit may be faulty , have the OBD codes read to confirm

You need to look at the temp sending unit it's probably faulty anthor issue with volvo is dirty throttle body's this raises havoc on the car they idle up down all over the map also you should change the thermostat too as a precautionary measure make sure it's the right temp for your year of your car thanx Chris

Time to change the thermostat if you not already have done so. This is the cause of most overheating problems, although a good radiator flush may solve the problem also. The fan will stay running until the engine coolant reaches the proper parameters and then shut off.

Do a Compression Test, do a VISUAL INSPECTION of the Spark Plugs. If there is a COLOR DIFFERENCE and / or the Spark plugs on Cylinder 1 and 2 are CLEAN. you have a blown head gasket.

I have done so many of these 1.9 liter Turbo's with this same Problem that I can no longer count...

The temperature sensor for the fan now does it run when the engine is cold,with the a/c off? That fan only need to reun when the engine is about to exceed operating temperature,The sensor itself may have shorted out, It is not need when engine is cold unless the a/c is commanded on

The S 40 came with different size and spec engines and they were not all Turbo charged versions. The choice of engines available depends on which country you are in.

The turbocharger is driven by the engine's exhaust system and runs continuously but has minimal affect at low engine RPM. Unless the turbo has failed, you should feel the turbo effect kick in when you accelerate hard but there will be a brief lag .

If you have the turbo engine fitted to your 2002 model S40 you will have a " 1.9T " badge on the rear of your car under the S40 badge. The "T" designates Turbo. An engine designator badge without a "T" indicates it is not turbocharged.

The turbochargers on these S40 models will fail (especially if the car has done a lot of miles) so you should have your car examined if you feel the turbo is not functioning.

hi its rob change the temp switch normly on the cylender head

sounds like either the cam or crank sensor is going bad, test both and get back to me