Hi there,

A problem is causing my battery to drain when switching off my 2005 XC90.

The blower continuous to operate when I switch off the car and take the key out (until the battery drains in 15-20 minutes).

Also, I cannot control the 'speed' of the blower anymore when driving, it seems always at the highest possible speed, very noisy, although the LED indications of the FAN speed can be controlled, it is always at the highest possible speed in normal or air-conditioning position.

Anybody has seen this problem before? How to tackle it?

Thanks!

 

sounds like a stuck relay (hopefully located in accessible place) -if it is blower motor power unit , the whole dash has to be removed .. ayy..

 

Thanks, much appreciate it!

I have found the fuse for the blower but not yet the right relay in the engine department (fuse/relay box).

How would I know if is a stuck relay? Where are they located?

- Ramon.

 

there are two more fuse/relay boxes in the cabin -you will need to find relay "responsible' for the blower motor, then if you pull it out the blower should stop

can't help more since I sold XC90 already ...

 

I have a 04 XC90 with the same problem. Blows without the key till the battery is dead. Dealer thought reprogram the software, (at my cost) but that has not helped. So I am at a lost too.

 

Hi, for my xc90 this was the time consuming (read expensive) replacement of the power unit. North of 500 USD....

 

Mine does that as well but I read in the manual that 50 minutes after the car is turned off the blower will automatically come on for 7 minutes. It is suppose to do this only when the air conditioner as been on, in order to remove condesation. I replaced the original battery and haven't had it drain since. However, mine was not on right away but after 50 minutes like the manual states. Hope you can figure it out. These cars are kind of a pain.

 

i had the same problem on my BMW, found out it was the blower resistor. The dealer wanted $496 to replace, i found it online went to youtube and looked up how to replace the blower resistor on my car. it took 10 minutes, pulled the old one out popped in the new one and everything woorks great. all for $89 and 10 minutes under my dash

 

My inlaws have a Suburban that had the exact same problem. In their case it turned out to be the fan control module. On theirs it mounted right next to the fan on the vent box... it looks like its the same on the XC90. See component 4/31 on the XC90 wiring diagram. It varies the speed of the fan based on a control signal from the climate control. From the diagram it looks like A1 and A3 are the inputs from the computer. You should see a different voltage on those connections depending on the fan speed you set if it operates the same as the GM system.

 

Had the same issue with my 2006 XC90. Took it to dealer after battery drained twice this week. They scanned and gave me the horrible news that a new blower motor and resistor was needed. The nearly $1300 estimate was criminal, but they explained that they would have to remove the dash to get to it.

So, I found a local volvo specialist and they scanned again and it was indeed the blower motor. So, they worked out a deal for me to save me 30% off what the dealer charged and work was completed in one day (picked up my truck this morning). At just a few pennies over $900 my fan stops when I turn the truck off and if I turn the control know off on the climate control. Neither were the case before the repair.

Also, was told that the issue with the XC90 blower motor requiring the dash be removed is the firewall is notched to accomodate the tires. So, for the do it yourselfers, if you pound out the fire wall you can save yourself from having to remove the dash to remove the blower motor.

Now, my wallet is empty and my XC90 is perfect again.