Of course the hottest day of the season would bring this to us during a road trip. The car is a 98 S90 (964) with 223000 miles.

The blower motor is difficult to remove so I am going to do some checking before trying to remove it.

I can reach into the recirc intake and spin the cage by hand. I think that it should spin more freely. Bad sign.

I would like to operate the blower fan directly from a power source to observe how it spins and its current draw. The blower B+ is a 20 ampere fuse. I can find no specification for the blower motor current. Does anyone know how much current this thing should draw?

 

I don't think I have a legitimate fan overcurrent problem.

I found some cracked solder in the fan control box but I think the problem is in the ECC control brain.

The ECC will generate this fault code if there are certain problems with the fan control box or the control brain.

In my case the ECC is not generating the signal to run the fan, but it does not realize this. The transistor is not switching on so the fault code is set.

For the meantime I have removed wire #6 from the six pin connector on the fan control box. This does not make the fan work reliably but at least the compressor will run and ECC will keep trying.

 

The problem with my blower is the ECC control box. I think something in IC10 went bad, i get the fan drive signal into this thing but it doesn't come out.