If the floor was wet, you need to replace the heater core. The s80 is the easiest core replacement I have ever done. It is under dash on the driver's side. Just remove the two bolts, slide the old core out and slide the new core in.
SOURCE: Volvo 850 heater blower
As you can read in the first response that is most likely the problem..as long as you're gonna be doing all the labor, if you can afford it replace both the resistor and motor at he same time if you plan on keeping the car.
SOURCE: I have a 2005 Volvo
Well, do you suspect rain? If not, a/c water does this. It is remarkably clean, compared to other leaks...Look for little black press on hoses about 1/2 inch in diameter...often dislodged in error by a foot or repair guy.....
This drain comes from the very bottom of the heater box areas...
SOURCE: fan blower motor only works
That's what it sounds like to me.
If the blower is making noise than the only thing you can do is replace it.
Blower resistors typically operate by dropping voltage through a set of resistors. The lower the speed the more resistance is needed. High speed requires no resistance and usually bypasses the resistor assembly.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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