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Old 04-26-2015, 12:25 AM   #1
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Default Wiring Issues

About a year ago, I had my motor replaced in my car. Everything is going good, however, there is a wire running from the engine to the fuse box and is connected to the AC/ HEATER fuse. Everything works just fine that is until I turn on the AC. As soon as the fan for the AC comes on the fuse blows and my main fan that keeps the engine cool (I guess) goes off, which means I have to replace the fuse. So I just don't use the AC at all and the fuse never blows. I really need help with this issue please.
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Old 04-26-2015, 12:57 AM   #2
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If you idle/allow the car to get hot, does the fan still work to cool the engine?
Ever seen the fan go high speed, without blowing the fuse?
I'm wondering if it is a fan problem or high speed relay, could be an exposed wire touching metal, causing a short somewhere?
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Old 04-26-2015, 01:19 AM   #3
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The fan works just fine. Its just when I turn on the AC the AC/ HEATER fuse blows and the main fan shuts off. I think it has something to do with this wire that I believe is connected to the main fan which runs to the AC/ HEATER fuse.
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Old 04-26-2015, 01:43 AM   #4
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I've heard of a compressor clutch with a short causing the fuse to blow.
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Old 04-26-2015, 02:04 AM   #5
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When you turn on the A/C it commands the engine cooling fan to run at high speed.
At the same time the blower motor interior fan can go to full high speed as well.
That is quite the draw. What is the Amp rating of the fuse that is blowing?
Can you check your owners manual to confirm it is the right Amp fuse for application?
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Old 04-26-2015, 03:20 AM   #6
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It has a number 10 on it, and I looked in the manual and its the right one for the AC/HEATER.
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Old 04-26-2015, 09:29 AM   #7
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WTF, by the way, please don't start multiple threads with the same question.
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Old 04-26-2015, 12:11 PM   #8
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Ok I just downloaded the owners manual for a 2002 Oldsmobile Alero.
There are 3 fuse panels. #1-under the hood #2 Interior drivers side #3 passenger side.
Using your manual can you tell us which fuse block and what number fuse it is.
I do not see anything specifically listed as the AC/ HEATER fuse.
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Old 04-26-2015, 02:36 PM   #9
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Here'* the location of the HVAC Blower Motor fuse. There'* another for the HVAC Head in the driver'* side panel.
Attached Thumbnails
Wiring Issues-fuse.jpg  

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Old 04-26-2015, 04:13 PM   #10
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This wire is running to minifuse number 46 which under the fuse box under the hood is labeled as HTR-A/C (10A). This is the fuse that blows when the AC is turned on and also causes the main fan to turn and does not come on until the minifuse is replaced. So I believed that wire is running from the main fan to this minifuse, in which I think it should not.
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