My vent fan only works when set to the highest setting (4), otherwise nothing! I am guessing it is a failure of the switch - do I have to remove the whole dash or can I just remove the fan knob panel? Also it seems that even on high sometimes there isn't much heat (although not 100% sure about this - mentioning it just in case). Any help would be appreciated!
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Re: vent fan only works when set to 4
On your Vehicle the problem for the FAN speed is NOT the FAN switch.
99.9 % of this problem on cars is the BLOWER MOTOR RESISTOR.
The blower motor resistor give the speed to the Fan.
But on High speed the switch make a By pass of the switch using a Relay for the high speed.
The Blower motor resistor, is located Beside of the Blower motor On the passanger compartment.
If you replace the blower motor resistor you have 99.9% of this will solve your problem.
I'm a Mechanic.
I hope this help on your problem.
Thank you for use fixya...
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Jan 17, 2014 - Uploaded by RodneyDickson
In this example, my 2001 Toyota Echo had its fan vent selectorindicator stuck in one position of the dial ...
Aug 4, 2011 - Uploaded by Laiwah Manh
The fan in your car stopped working except when set to the highest setting. ... Sign in to make your opinion ...
The highest fan speed setting bypasses a device that reduces voltage to the fan for the lower speeds.
This is a fairly common failure but the actual mounting of this device can be anywhere; firewall in the engine compartment or under the dashboard.
You can jumper the fan motor to make sure it runs and if it does then look at the switch or resistor. You can also remove the resistor and omh acrossed it to make sure that it hasn't blown the fuse on risistor.
Hi J, I believe the problem is with the resistor inside the the climate box. If you remove the covers from the side of the center consul and look carefully at the heater unit you should see a small panel (Maybe two inches square) with an electrical connection attached. Remove the plug and then the retaining screw and withdraw the unit. On the back of it you will see wire wound resistors. These are for the lower speeds of the interior fan operation and if blown the fan will only operate at the highest speed. either replace the unit or reconnect the broken wires and refit. Regards John
> With the control set 1 2 3 4 it does blow any air, ? does NOT? A common problem with this control is the failure of a stepped resistor which causes only the highest speed to still function since this bypasses the resistor. Tracing the leads from the fan speed switch may help locate it.
My guess would be that the resistor block located in side of air duct between blower fan and evaporatorbox has burnt out one or two resistor coils and requires replacing or repair.I have never seen Volvo A/c but would expect this to be the problem.The block is located in the airstream to keep it cool .By moving your setting switch you are selecting differing resistance coils (or a combination of same) thus with failure lose various speeds.
You have a problem with your reostat. This is located under your dash behind the glove box and beside the blower motor. Unplug the plug and take out two screws hold it in place. Take it to your local recycle yard and get a good used one make sure to ask if it was tested and if it has warranty. Please let me know how you make out. Thank you