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Username Post: 2003 Malibu HVAC Fuse Blowing, Short in system?        (Topic#348048)
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-04-17 03:01 PM - Post#2713272    

So first some background, I'm not really a car guy (I can stumble through but that's about it), so just trying to see if anyone else has run into this and if it's something I can deal with myself. Secondly, I'm in Central Alberta, we just got our first real snowfall of the year, so it might be because of the cold, the timing is suspicious.

Heater/Fan system was working fine til a couple days ago, when I went to go change the blower settings and the whole thing just died. No fans, when changing settings back and forth from the window to the passenger fans I can hear some faint whirring in the dash like it's trying to start, but then nothing.

Looked at the Fuse box in the engine compartment, #53 had blown. So I replaced it, but it blew again almost immediately after turning on the car. As far as I can tell none of the other fuses are blown, and I'm not sure if there's a way to determine if one of the relays is faulty without changing it (?).

Any idea what could be happening? My guess is a short in the heater/fan system, but that's just a wild guess.

Thanks!



 




rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-04-17 08:08 PM - Post#2713295    
    In response to BigDamnArtist

unplug the heater resistor and see if the fuse still blows.
They are very common to failure.
Both the plug and the part itself.
Should be on the passenger side above the passenger side hush panel IIRC

Old School GM fan FOREVER


 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-06-17 03:46 PM - Post#2713485    
    In response to rockfangd

Okay, so good news, I think. I unplugged the blower motor resistor (I couldn't find any reference to a heater resistor, so I think this is the same one), in the passenger wheel well behind the blower motor. Fuse didn't blow, and I got the fans working on the highest setting. Car wouldn't start which I assume is just a safety thing with having that resistor unplugged, so I couldn't check the actual heaters.

So I'm assuming I just need to replace that resistor and I should be good to go?



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-06-17 07:51 PM - Post#2713525    
    In response to BigDamnArtist

car should start fine with it unplugged.
Yes it is the blower motor resistor.
Assuming you found the right part.
https://www.rockauto.com/info/315/15-8966_Prim ary_...

Old School GM fan FOREVER


Edited by rockfangd on 11-06-17 07:53 PM. Reason for edit: No reason given.

 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-07-17 02:18 PM - Post#2713595    
    In response to rockfangd

Hmm, strange. That's the part. I was following this video.

https://www.youtube.com/watch?v=vLdMYx6fhic

I'm picking up a new resistor right now. I'll swap it out and see what happens.



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-07-17 06:49 PM - Post#2713622    
    In response to BigDamnArtist

Thats it. 4 or 5 pin.
held in place by 2 screws IIRC

Old School GM fan FOREVER


 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-08-17 05:37 PM - Post#2713709    
    In response to rockfangd

Alright, so I (finally) got the resistor swapped out, that rear screw is a real pain to get out. Plugged everything back in, and put a new fuse in, turned the car on, and it's still blowing.

However, the interior lights are now dimming ever so slightly when I'm changing the blower setting which wasn't happening before. So I'm going to take that as a good sign until told otherwise.

The only other thing I can think of is the relay under the hood. But I'm all out of fuses right now to test it.



Edited by BigDamnArtist on 11-08-17 05:42 PM. Reason for edit: No reason given.

 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-09-17 07:38 PM - Post#2713852    
    In response to BigDamnArtist

hmm.
Blower motor is good?
Does it work and sound good?
If it does I would start looking for pinched or chaffed wiring

Old School GM fan FOREVER


 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-12-17 01:53 PM - Post#2714175    
    In response to rockfangd

Well, I don't know what I did, but I just swapped in a new fuse and the whole system started up perfectly. So I'll take that as a win until it decides to stop working again.

Thanks for your help!



Edited by BigDamnArtist on 11-12-17 01:53 PM. Reason for edit: No reason given.

 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-12-17 11:33 PM - Post#2714210    
    In response to BigDamnArtist

It seems that may have been premature. Just went to go start the car and now nothing's working again.

The only thing I can tell is that it was cold outside the first time I tried, and nothing worked, it was warm over the weekend when I tried it and it worked, and it's cold out tonight when it doesn't work. I have no idea if the fuse blew when I just tried, not exactly in the mood to try pulling it at midnight.

It's supposed to be around 0 tomorrow so I'll try again and see if it works.

Any idea what might be temperature sensitive in the system? When I tried it just now, when I turn it to the passenger fans there is a dull whirring noise from the fan ports/dash area like it trying to do something, but then gives up.



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-13-17 06:45 PM - Post#2714301    
    In response to BigDamnArtist

the blower motor.
If the blower motor is dry, tight, or burnt it may very likely exceed the amperage and blow the fuse.
When it is warmer it is common to work better.
By the way what size fuse are you using?

Old School GM fan FOREVER


 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-13-17 06:57 PM - Post#2714302    
    In response to rockfangd

Hmm, okay, I'll take a look at that next time I can get in there. The blower motor is the big fan under the glove box yes?

And 30A, same as what was in there originally.



 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2213

Age: 31
Loc: Utica ny
Reg: 04-13-10
11-13-17 08:03 PM - Post#2714307    
    In response to BigDamnArtist

yes.
Ok. It takes a bit to pop a 30. the motor could do that though.
It sounds perfectly normal when it is working though?

Old School GM fan FOREVER


 
BigDamnArtist 
Forum Newbie
Posts: 8

Reg: 11-04-17
11-16-17 08:12 AM - Post#2714624    
    In response to rockfangd

Yeah, the motor sounds fine. I'm wondering if it could be the actual blower speed control on the dash? It's been working pretty consistently on the 4 setting for the past few days, but on any other setting it just dies. Completely silent.

It hasn't blown a fuse since that first one after I swapped out the resistor.



 




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