2006 v50, I can hear the fan running but no air flow is coming thru any of the vents?!?! Is there a fuse for the dampers? I'm just starting to get into this so any info where to start is appreciated. Thx.

 

Probably a mode controller (kind of a stepper motor that moves flaps around inside your dash's heat/AC system to direct airflow. Here's a diagram that should be like your car (or very similar, at least)...


The mode controllers themselves are the devices labeled 6, 7, 8 and 9. Look also at the linkages that they move (#4 and 5) to see if one of them might be loose, broken or otherwise messed up.

Or it's always possible that the fan blades (being plastic) have come loose from the motor shaft. If it was making "odd noises" before quitting altogether, this is a distinct possibility.

And finally, I've seen fans get so much debris sucked into them that they no longer move much air, though usually by then they're making some "unusual noises" as the fan attempts to grind a pound of (for example) pine needles to dust.

 

+1 on the debris. I had the case where the fan in my wife's highlander was not blowing right and making noise. Opened it up to find the cabin air filter had been pillaged and turned into a mouse house right on top of the blower.

 

Ok, I'm thinking of using a bore scope down the inlets to look for debris. The fan sounds normal and I dont smell anything like rodent ****, which was my 1st thought also. Does the dash hafta come off to access the servos? Thx.

 

Never had to dig into the dash - if you can't see the mode controllers, just keep taking off panels until you can. ;-) Not sure how hard it is to pull hte fan, but I know on my V70, it was pretty trivial.

 

It's looking like the cabin filter is the problem child here. Problem being its a real **** to get too, especially being 6'3" 260lbs with linebacker shoulders, anything under dash on this car is tough to get too.. The gas pedal has to come out 1st, good luck getting to the top nuts. I'm gonna try something a tad bit unorthodox here. I'm duct taping the inlets on the firewall except for a small area i can hook a shop vac up to, then Opening one output grate inside at a time and blasting compressed air thru the grate while the shop vac is sucking out the inlet. I tried the compressed air on a couple output grates and it improved the air flow some. So hoping it will get better with the shop vac also. It's not a perfect solution but it may back blast the filter clean enough to work.

 

If it's really the cabin air filter, the problem should have developed over many months, and I'm not a bit sure that reverse air flow is likely to "fix anything" for more than a very short time.

Also, I know I swapped out the cabin air filter on my 2005 V50, and it was a trivial job (so easy I don't recall how I did it). I know I wasn't removing things like the accelerator pedal though... I'd suggest doing a search on that job online and seeing what's REALLY involved.

 

Did research and the vid I saw the 1st thing was to remove the gas pedal. Ill dig deeper for other help vids. Thx.

 

The accelerator pedal is right in the way of removing the cabin air filter - it has to be removed.
I have the same issue with no air coming out of the dash board vents; the defroster and lower vents work fine. I did replace the cabin filter last summer - not sure it installed completely, since it had to be slightly folded to fit in the duct (with the gas pedal removed). It would seem all of the vents would not work, not just the dash vents, if something were blocking the ducting at the cabin filter.

 

Look at my post #2 way above...

 

yea - I agree, probably a mode controller or associated linkage.

 

If you can hear the blower fan running in your 2006 Volvo V50 but no air is coming through the vents, the issue is likely related to the air distribution system specifically, the mode door actuator, which controls where the air flows (such as to the dash, floor, or defrost vents). These actuators are small electric motors that move internal doors inside the HVAC system. If one fails or gets stuck, it can block airflow completely, even though the fan is working.

It’s also possible the problem is electrical, such as a blown fuse that powers the actuators. You should begin by checking the HVAC-related fuses, both under the dashboard and in the engine bay. If the fuses are good, the next step would be inspecting or diagnosing the blend or mode door actuators, which may require removing panels under the dash. In some cases, the actuator fails mechanically a stripped gear or stuck flap and it needs to be replaced. If you’re just getting into DIY repairs, this can be a good project to learn from, but it may help to get a repair manual or watch some V50-specific HVAC troubleshooting videos to guide you through the process.