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Hi,

The self-test shows that the fan speed controller is not working, and in effect we have no heater considering its getting winter here. So I would like to do some troubleshooting, and I've already checked the 40A fuse and relay, however I would like to change out the fans speed controller with a spare one to see if that makes a difference. But I'm not even sure what it looks like, and where it is.

Thanks
-VARIS
 

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Mounted on a heat sink plate which is fitted into the front of evaporator box a little below where the receiver dryer cylinder is mounted.

You might have to remove top mounting screws of false firewall to move FFW enough to remove it.

Check first square 4-wire connector to it which is usually visible near side of evaporator box straight back from upper engine mount body bolt area.
 
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