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2005 S80 Vent fan won't stop nor vary speed

Everything on the Volvo S80. Sometimes called an "executive car", the S80 was Volvo's top-of-the-line passenger car. P2 platform.
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donf
Posts: 13
Joined: 27 April 2009
Year and Model: '89 s70, '05 S80
Location: Texas

2005 S80 Vent fan won't stop nor vary speed

Post by donf »

I'm not talking about the fan continuing for a few minutes after the engine is shut down.

The fan first started blowing only on high speed. tried turning it manual, no change. Stopped, continued. removed key, continued. waited 30 minutes, continued.
This lead me to remove the fuse. The next morning I replaced the fuse (key out of ignition) got a spark, fan ran at high speed for a few seconds then slowed down and everything worked perfectly for a few minutes. Then it started running at slowest speed but otherwise the symptoms are as above.

it's 106 in Dallas - I need working AC!

I see some posts referencing a 'resistor' but am unsure if it is on the blower motor or fan speed control. Doesn't seem to be a consensus. Also - is the fan under the dash behind the glove box or in the center console? (just did the same repair on wife's acura in the console - 15minutes! Don't expect to get lucky twice though)

Please help - need to repair this myself cheaply so I can keep my son's S70 on the road!
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jimmy57
Posts: 6694
Joined: 12 November 2010
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
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Post by jimmy57 »

The fan power unit is mounted to the blower motor. It is a transistor circuit and either the transistor or the control circuits do fail on occasion
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