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Old 02-14-2015, 10:38 AM   #1
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Default Blower motor questions

I have a 1997 Bonneville. For some reason my fan doesn't push much air or heat around even when I can get it to go to the correct location. Is there a way to put in a stronger fan per se or am I stuck with low air flow? The fan changes speeds at each setting low through high so I know it'* not that. My buddy had a 98 and said his was the same way and that all the Bonnevilles him and his family owned were the same way but I'm curious if there isn't an issue? My wife'* 02 300m blows like crazy and I want to get mine somewhat like that.
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Old 02-14-2015, 11:38 AM   #2
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This may be worth a look:
https://www.gmforum.com/normal-maint...-clean-278997/

While there are other things that could affect it, this is usually a good place to start, and yields the biggest improvement.
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Old 02-14-2015, 05:21 PM   #3
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would agree, its not "just like that" having had mine from fairly new i can say it blows good. just alot more people dont clean the evap and let junk build up in there till it becomes an issue than do.
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Old 02-15-2015, 10:44 AM   #4
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I agree......you can have a very small A/C leak, and over time, oil gets on the fins and attracts dirt that can plug up the fins.....the other possibility, is a nest created with leaves/stuff, that block the fins of the evap....

By pulling the resistor block(or blower control module, if you have auto temp), you will have an opening to see what is in there.....should vac anything out of there that is loose before attempting to spray a cleaning solution.....and as the link stated, make sure the drain is not clogged.....

If there is a lot of debris in there, it would be a lot easier to get to by removing the blower motor....unfortunately, removing the blower motor is no easy job....

I'll never forget the day I pulled a blower motor on a Grand AM, to clean the evap, and when I stuck a mirror and light up there , saw these two little beady eyes looking at me!
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Old 02-15-2015, 04:28 PM   #5
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I've actually cleaned it out. When I did my ac I replaced everything on my ac system and I pulled the evap core and cleaned it. It was indeed filthy. But now it'* clean...
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Old 02-15-2015, 04:37 PM   #6
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If it is clean I'd be more concerned with how adequately it cools, or heats up.
I don't think the hassle of finding a higher powered blower motor, and getting it to fit would be worth doing.
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Old 02-15-2015, 05:52 PM   #7
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Ok. It starts blowing heat after about five minutes of idling if it'* 30 degrees or warmer. If it'* colder than that it takes about 8 minutes idling or five minutes moving at 30 mph. I forgot that I replaced the evaporator core. It'll blow cold air after five minutes during summer.
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Old 02-16-2015, 09:32 AM   #8
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it seems kind of normal, if its 30 or so after 5 minutes or so i have to turn it down and if the wife is there she complains she is still cold.
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Old 02-16-2015, 07:05 PM   #9
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Do you notice any difference in air flow when the recirc door is moved to the close and open position, while the mode is in vent position, so air flow is out of the dash registers?

Also, I'm not sure if this model uses a cabin filter....but if it does, it may be dirty....
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