Volvo blower speed is controlled by an NPN power transistor -N3055- which most people for some reason call a resistor. Its under the dash on the passenger' side. It gets very hot and normally packs due to that, you'll find it on a heat sink somewhere there, very easy to test, cost less than a dollar to replace, you'd be surprised!
have you checked your fuse? If it won't blow out the air it could be your blower motor.
In a 2004 Volvo S60, if the blower motor only operates at one speed, it is likely due to a faulty blower motor resistor or a problem with the blower motor itself. The resistor controls the different speeds of the blower, and if it fails, the blower may default to a single speed, usually the highest. Additionally, issues with the vehicle's HVAC control module could also contribute to this problem. A thorough inspection of these components is recommended to diagnose and resolve the issue.
Could be either or, but also a switch, not to exclude wiring or connections.
There could be several reasons why the blower only works some of the time. It could be a faulty blower motor, a problem with the blower motor resistor, a malfunctioning switch or control module, or an issue with the electrical connections or wiring. It's best to have a professional diagnose and fix the problem to ensure the blower works consistently.
the Blower resistor pack is in the vent along the firewall its a white retangular door 1"X2" with one screw with a star head... your local ford dealer has replacement resistor packs and have been redesigned...It fixed the problem with mine...It only cost $14 I have a 1995 ford explorer console fan is not blowing at all (heat or cold). Checked fuse and its OK. Also checked for power to fan (no power). Could it be this blower resistor or blower relay?
What could be the problem when a 2002 Volvo won't stay stared
blower resistor especially if its chrysler/jeep or blower switch
Typically a relay or resistor. But could be a blower switch or blower motor problem.
Could have just overheated
I have experienced the same problem a couple of times recently. I have no idea what this might have been, but it definitely sounded like a leaf blower and it happened twice when engine was at normal operating temperature. At first, I thought the noise was coming from outside (somebody using the blower), then, when I realized it is coming from under the hood I stopped and checked. However, I could not pinpoint the problem. Did you get this resolved and /or look at? Please share your experience.
This could be your actual blower motor that is bad. It is spendy and hard to get to, but this could be the problem.
As for why it blows only on the high speed you most likely will have a bad blower resister and for the noise, it could be a bad blower motor, bad blower wheel or trash that is stuck in the blower wheel or housing.......