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Old 10-04-2005, 07:22 PM   #1
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Default Erratic Blower Motor Operation

I've been having trouble with my 95 SSEi, and the blower motor for the A/C working intermittantly. I think I've discovered the solution by reading other similar posts, but mine also does 2 other things that I haven't seen addressed so I thought I ask all of you for possible ideas for a solution.
On many occasions when the A/C has decided to work, it starts out blowing on high just like it should. As I drive, the air output will get slower and slower till the point where cold air is just barely coming in but the A/C controller still says it'* on high. Would this still be just the blower motor?
The other thing it does is it will be blowing on high, and sometimes when I deccelerate the air output will stop and once I accelerate again, it comes back on again. What could be causing this?

Thanks in advance.
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Old 10-05-2005, 01:56 AM   #2
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Default Re: Erratic Blower Motor Operation

Quote:
Originally Posted by ColoBonne
I've been having trouble with my 95 SSEi, and the blower motor for the A/C working intermittantly. I think I've discovered the solution by reading other similar posts, but mine also does 2 other things that I haven't seen addressed so I thought I ask all of you for possible ideas for a solution.
On many occasions when the A/C has decided to work, it starts out blowing on high just like it should. As I drive, the air output will get slower and slower till the point where cold air is just barely coming in but the A/C controller still says it'* on high. Would this still be just the blower motor?
Hmmm Multiple answer question...
The only thing that forces airflow thru the vents is the squirrel cage blower.
The blower is (of course) powered by the blower motor, and it'* shaft, rides on lubricated bushings.
The cage itself is usually bulletproof, unless it'* been in a collision.
That leaves the motor, and the bushings.
Starting with the easiest.... the lubrication gets dirty and sometimes,
will stick, or cause excessive drag on the shaft, slowing it down.


Quote:
The other thing it does is it will be blowing on high, and sometimes when I deccelerate the air output will stop and once I accelerate again, it comes back on again. What could be causing this?

Thanks in advance.
I feel from your description, that this is the case. when you accelerate the cage and shaft are forced rearward, to where the dirt and gum is less "Sticky" ( for lack of a better term) and when you brake it returns to the more resistive area. pull the motor and cage, and clean the shaft with a good degreaser, dry , then add a few drops of light oil to the shaft where it touches the bushings. You'll have to disassemble the motor to get to the rear bushings.
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Old 10-05-2005, 11:54 AM   #3
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Do you have any water leaks in the car? Floor wet? Have you had any other electrical work done to the car recently?
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Old 10-05-2005, 01:13 PM   #4
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Default Erratic Blower Motor Operation

There are no water leaks in the car, and I've had no electrical work done to it ever.
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Old 10-05-2005, 01:46 PM   #5
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First and foremost, make sure you have done the Evap cleaning found here:

http://www.bonnevilleclub.com/techinfo/?article=62

to be sure that there is no blockage.

Then make sure you have done other diagnostics mentioned in Techinfo (top of the screen). If you can pull any codes at all from the Climate Control, that would be ideal for us.

Err..do you have automatic climate control in your car?
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Old 10-05-2005, 05:50 PM   #6
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Default Erratic Blower Motor Operation

Oops, sorry about that guys, I should have mentioned that I do have Automatic Climate Control.
Thanks for all the help. I'll be taking the blower motor out this weekend. Let you know what I find, and if it fixes the problem.
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Old 10-05-2005, 09:40 PM   #7
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Your evaporator coil isn't freezing up, is it? That would be the sign of a low refrigerant charge & would cause restricted air flow across the evap coil.
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Old 10-05-2005, 10:20 PM   #8
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If there were a blockage of the evap core, wouldn't you think that the airflow would be constantly blocked rather than intermittent as described?

Quote:
it starts out blowing on high just like it should. As I drive, the air output will get slower and slower till the point where cold air is just barely coming in
The next time this happens, check to see if the airflow is being directed to the defroster vents rather than the dash vents as indicated on the ECC head. This would indicate a vacuum loss. Usually, this is caused by a disconnected vacuum line at the vacuum tank but could also be further down the line.

Please verify if the air flow is being directed to the defroster vents.
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