blower bench tests but dead when installed

Oct 10th, 2005, 01:41

I took the blower out of my '96 850 GLT and jumped it to my battery and it spun like a champ.

The original symptoms were:

- fan would not work at all
- #5 30A fuse eventually blew
- after replacing the fuse, it quickly blew again

Now, when removing the blower there was a tiny piece of hard black plastic that came out too. Thinking maybe it got lodged, stopping the fan from moving and causing enough of a draw to blow the fuse I tried making the connection to the fan with a replacement fuse in the box.

Nothing. Then realized that there are those two connectors which plug into each other right by where the blower power connects. With the fuse in and the power plugged into the fan, I find that putting those other two connectors together makes the blower work. This is with the blower out, the key out (or in), and the dashboard fan controller off (or on).

What gives? Do I have to screw the blower back in to test the operation properly? Or is this indicating a short somewhere?

Marty

sholtby · Oct 10th, 2005, 17:05

The fan blades could be catching on the caseing when it is fitted stalling the motor. The bit of black plastic could be part of that caseing that has been worn off.

Simon

Oct 10th, 2005, 17:57

Here's the thing though. Although the fan spins when jumping it to the battery, turns out it also spins when reconnecting the power even with the key out of the ignition and the dashboard fan control set to off; this is apparently controlled by the two connectors near the power which plug into each other.

I noticed this after jumping to the battery. Thought would try to run it from the normal power cable uninstalled to see what happened. So now I'm wondering if there is a short somewhere. I mean I can't even reconnect it now w/o it running.

Marty

sholtby · Oct 10th, 2005, 18:04

As you say it could be a short or maybe a problem with the speed contoller. Is the fan swiched on the positive or negative side?

Simon

Oct 10th, 2005, 18:16

Woops, I don't know what that means "is the fan switched on the positive or negative side".

Marty

sholtby · Oct 10th, 2005, 18:48

>Woops, I don't know what that means "is the fan switched on
>the positive or negative side".
>
I was curious if there was a +ve supply to the fan and the switch(control) was in the negative lead? It isnt that relevant dont worry.

Simon

Oct 10th, 2005, 01:41	#1
MartyLandman Guest Location:	blower bench tests but dead when installed I took the blower out of my '96 850 GLT and jumped it to my battery and it spun like a champ. The original symptoms were: - fan would not work at all - #5 30A fuse eventually blew - after replacing the fuse, it quickly blew again Now, when removing the blower there was a tiny piece of hard black plastic that came out too. Thinking maybe it got lodged, stopping the fan from moving and causing enough of a draw to blow the fuse I tried making the connection to the fan with a replacement fuse in the box. Nothing. Then realized that there are those two connectors which plug into each other right by where the blower power connects. With the fuse in and the power plugged into the fan, I find that putting those other two connectors together makes the blower work. This is with the blower out, the key out (or in), and the dashboard fan controller off (or on). What gives? Do I have to screw the blower back in to test the operation properly? Or is this indicating a short somewhere? Marty

Oct 10th, 2005, 17:05	#2
sholtby Premier Member Last Online: May 26th, 2010 20:17 Join Date: Dec 2002 Location: north east	RE: blower bench tests but dead when installed The fan blades could be catching on the caseing when it is fitted stalling the motor. The bit of black plastic could be part of that caseing that has been worn off. Simon

Oct 10th, 2005, 17:57	#3
MartyLandman Guest Location:	RE: blower bench tests but dead when installed Here's the thing though. Although the fan spins when jumping it to the battery, turns out it also spins when reconnecting the power even with the key out of the ignition and the dashboard fan control set to off; this is apparently controlled by the two connectors near the power which plug into each other. I noticed this after jumping to the battery. Thought would try to run it from the normal power cable uninstalled to see what happened. So now I'm wondering if there is a short somewhere. I mean I can't even reconnect it now w/o it running. Marty

Oct 10th, 2005, 18:04	#4
sholtby Premier Member Last Online: May 26th, 2010 20:17 Join Date: Dec 2002 Location: north east	RE: blower bench tests but dead when installed As you say it could be a short or maybe a problem with the speed contoller. Is the fan swiched on the positive or negative side? Simon

Oct 10th, 2005, 18:48	#6
sholtby Premier Member Last Online: May 26th, 2010 20:17 Join Date: Dec 2002 Location: north east	RE: blower bench tests but dead when installed >Woops, I don't know what that means "is the fan switched on >the positive or negative side". > I was curious if there was a +ve supply to the fan and the switch(control) was in the negative lead? It isnt that relevant dont worry. Simon

Oct 10th, 2005, 18:16	#5
MartyLandman Guest Location:	RE: blower bench tests but dead when installed Woops, I don't know what that means "is the fan switched on the positive or negative side". Marty

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