How do i turn on the headlight wipers for my 2001 volvo s80

SOURCE: VOLVO S40 2001 HEADLIGHT WIPER MOTORS

Behind Headlamp remove wiring clip and tape it off. At the same time tie off the water pipe. That'll do the job quickly. Otherwise removing the whole wiper system isn't a big job.

SOURCE: VOLVO S40 2001 HEADLIGHT WIPER MOTORS

you can disconnect the wiper motor from the harness by just removing the plugs don't have to worry about a fuse.

SOURCE: 2001 Volvo S80 2.9L air conditioner stops cooling

This could be one of many problems so it's probably best checked by someone with the correct tools and knowledge.

That being said,

With your engine cold, open your hood and start your car. Check to see if your cooling fan is engaged, take note of its speed if it is. Then turn on your AC and listen for the compressor clutch to engage. once you hear it, check to see that your cooling fan is blowing, if it wasn't before. The fan should be on and in high speed whenever your AC is on, whether the engine is hot or not. If it is not, then the reason for losing cold air is that, due to the lack of being properly cooled, your freon pressure is getting too high and is causing the compressor to turn off.

If the fan is blowing as it should be, you may have a faulty compressor or the clutch on it may need to be shimmed.

Another culprit could be that your system is low on freon or the switch that senses the pressure is faulty.

And yet another culprit could be a faulty relay that is overheating and shorting out.

Sorry I couldn't give you a difinitive answer as to what the problem is, but without diagnosing it myself, this is the best I give you.

Good luck!!

SOURCE: i have a 2001 volvo s80 t6 the check engine light

most likely the dealer. unless you have a vag com (for VW n Audi) system or similar system to what the volvo dealers use to check for engine codes

SOURCE: 2001 Volvo S80 T6 "Engine System Service Required"

Hold down the odometer reset button, turn the ignition key to position 1 for 1-2 sec. Then, turn the key to position 2 still holding the button down. Wait for the service light to flash and release the button. It can be tricky. It may take a few times to get it.