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A/C fuse melted

Tiny
VWTSI2017
  • MEMBER
  • 2017 VOLKSWAGEN JETTA
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 77,600 MILES
Hello

I have the car listed above TSI, it has started to blow out fuse for my A/C. Replace it with a same fuse it was originally installed. So, one day I turn on my A/C and I noticed it stopped blowing cold air and a burning smell or was in my car. So, I turned off my A/C. When I got home I removed the fuse cover and there it was my fuse was melted. Any idea why this happened?
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Thursday, June 2nd, 2022 AT 4:50 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

If the fuse was the correct amperage, it would have failed. How badly did it melt? It could have a spot where the fuse heated before blowing. Also, what amperage was the fuse, which fuse box, and is it the one for the AC compressor? I suspect it is a 15-amp compressor fuse in Fuse box C. See pic 1. Let me know if I'm correct.

Let me know. Also, let me know if this has automatic climate or manual climate control.

Take care,

Joe

See pic below.
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Thursday, June 2nd, 2022 AT 8:21 PM
Tiny
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It melted a lot so I'm going to need to replace my fuse box. So, I opened my fuse box to see if I could line up the fuse holder and I placed a new fuse and turned the fan on working good, but when I turned my A/C the fuse started to get warm. So, I pulled the fuse. It's a manual unit and yes it had a 15. I was going over my A/C and found out that my A/C pressure switch is not working.
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Friday, June 3rd, 2022 AT 8:15 PM
Tiny
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It melted a lot I'm going to need to replace my fuse box. So I open my fuse box to see if I could line up the fuse holder and I place a new fuse and turn fan on working good but when I turn my a/c the fuse started to get warm so I pull the fuse. It's a manual unit and yes it had a 15. I was going over my a/c and found out that my a/c pressure switch is not working
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Friday, June 3rd, 2022 AT 8:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

If the pressure is getting too high, it will place an excessive load on the compressor clutch/coil. That will cause it to draw more power to operate. It sounds like you may have found the cause.

My only concern is this. The fuse is designed to fail at a specific power draw. That truly should have happened before things melted. When you took the box apart, was there anything that seemed out of the ordinary? Are there any other things that appear to have been overheated?

Let me know.

Joe
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Friday, June 3rd, 2022 AT 8:52 PM
Tiny
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Hey Joe,

I didn't see anything out of the ordinary well, to be honest, it's the first time I open a fuse box. I have some pictures. I was planning on taking it apart to clean it out and see if I find something inside the box. So, the only thing holding me back is going to be trying to figure out where each wire goes where, maybe you have a diagram or a way to make it easy to rewire the fuse box back.
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Monday, June 6th, 2022 AT 6:56 PM
Tiny
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I have a question. I looked up how to check if your A/C pressure switch is out and I came across a video that says to use a voltmeter to check for continues. So, I checked my switch and got no beep, so I when and got me a new switch check it and nothing. So, I got back online came across different information that says some switch are open and some close. Do you know how I can find out if my pressure switch is really out? I really want to clean out my fuse box and set it up install a fuse and see if I fix it.
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Monday, June 6th, 2022 AT 7:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

If I had the vehicle, I would replace the fuse box. I don't see how you can fix what has happened. Also, I copied one of your pics from above. Are the wires I circled going to the fuse that melted the box? See pic below

As far as wiring schematics, I can try my best, but I need to know a few things. For example, I need the production date of the vehicle, is it a hybrid, and how would you best describe it? Is it more of a base model or is it loaded with options?

Let me know.

Joe

See pic below.
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Monday, June 6th, 2022 AT 8:58 PM
Tiny
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Yes, that's wire is the one that melted and is a base model manual 1.4L screen stereo but no navigation VIN starts 3vw167 and last 8 are hm207482.
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Wednesday, June 8th, 2022 AT 5:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

The only thing I have is the power distribution schematics. Take a look through them and let me know if they help.

Also, there are 5 pages of schematics. I had to cut each page in half to make them readable for you. I did overlap them so you can follow from one to the next.

Let me know.

Take care,

Joe

See pics below.
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Thursday, June 9th, 2022 AT 7:57 PM
Tiny
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Joe,

Thanks for your time and help.
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Thursday, June 9th, 2022 AT 9:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
You are very welcome. If you get a chance, let me know how things turn out for you. Also, please feel free to come back anytime in the future. You are always welcome here.

Take care,

Joe
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Friday, June 10th, 2022 AT 7:48 PM
Tiny
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Jacob, so it's me about a week ago the same thing melted fuse no A/C again.
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Saturday, August 6th, 2022 AT 2:02 PM
Tiny
JACOBANDNICKOLAS
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Hi,

That isn't good news. Did it melt the exact same way? Did any of the fuses fail?

Let me know.

Joe
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Saturday, August 6th, 2022 AT 7:29 PM

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