blower motor amp draw
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Printed Date: 20 Aug 2025 at 6:51am
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Topic: blower motor amp draw
Posted By: Bill_MN
Subject: blower motor amp draw
Date Posted: 27 Aug 2018 at 9:34pm
Hey guys, took my '89 mustang out for first time in a couple weeks and when I turned on the vent the blower motor was running slower than usual, and it pulled my voltmeter down a good bit, less than 13 volts though I don't have my multimeter here right now. I didn't have this issue the last time I drove it, what could change suddenly like that from sitting? I'm thinking bad blower motor or resistor, battery was new last spring and alt was replaced a few years ago with not many miles. Going on a fairly long trip next week so trying to catch it early if something needs replaced.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Replies:
Posted By: HD6GTOM
Date Posted: 27 Aug 2018 at 11:27pm
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Sons 2010 ford did the same thing, blower motor was bad. It took all of 20 minutes to replace it. His 17 year old son replaced it.
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Posted By: shameless dude
Date Posted: 28 Aug 2018 at 2:55am
Posted By: Stan IL&TN
Date Posted: 28 Aug 2018 at 7:18am
Will turning on the headlights cause the voltmeter to drop also? Might be a charging or battery issue if that is the case.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Posted By: DMiller
Date Posted: 28 Aug 2018 at 8:49am
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I can agree with the mouse nest aspect, pull the motor and see what lays inside the housing, could just be a corroded up motor but doubtful.
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Posted By: Bill_MN
Date Posted: 28 Aug 2018 at 6:03pm
I cleaned a mouse nest out of vents this spring and fixed inlet screen where they got in, fan and motor looked fine then. There is nothing to suggest another nest, no smell or strange sounds from fan area.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: LeonR2013
Date Posted: 28 Aug 2018 at 6:24pm
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check and see if the squirrel cage spins free.
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Posted By: chaskaduo
Date Posted: 29 Aug 2018 at 10:11am
The fan bearing or bearings could of gotten mouse pissed up.
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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Posted By: Dakota Dave
Date Posted: 29 Aug 2018 at 1:49pm
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I would be suprised if the running amperage is over 2 amps and shouldn't be noticeable. Run a hot wire direct from the battery and check the draw on it. You have load tested the battery first?
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Posted By: Bill_MN
Date Posted: 29 Aug 2018 at 8:10pm
Got my testing equipment here today, the battery and charging system tested fine, no mouse nests, the voltage drop with the fan on high was only about .2 volts so the volt gauge in the car was being a little over dramatic. The blower fan seemed to run a little faster today but still weak, so I'm thinking the fan itself just must be getting tired all of a sudden. At least no big troubles before the road trip.
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1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
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Posted By: Brian Jasper co. Ia
Date Posted: 01 Sep 2018 at 8:59pm
If there was a mouse nest in the blower wheel, you'd know it. They will vibrate the dash big time. Probably the brushes are worn. If that's the case I've seen them melt the resistor and connectors. Get it fixed before you go on a long trip. The fuse will be 40 amps so there's plenty of current capability to melt things.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: DMiller
Date Posted: 02 Sep 2018 at 7:33am
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If that Volt Meter is not ignored you may want to inspect the grounds to the body, I did have a bad Negative battery cable a few years back on a '91 ford Explorer that would increase the resistance to charging and the body/frame ground was not all that great where every drop in voltage would cause a increase in amp loads. The definer for me was hearing slight changes as to blower motor speed varying on its own, inside courtesy lights being a little dimmer at times, dash light flicker while driving and so on.
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