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Username Post: Fuse blowing AC        (Topic#361130)
jerryjerry05 
Newbie
Posts: 4

Reg: 05-26-20
05-26-20 11:30 AM - Post#2794891    

1999 Chevy Astro Cargo Van
The fuse under the hood blows the second I put it in.
The comp, new. the fan, new. the blower motor relay, new(changed it because the low speeds didn't work).
I unhook the comp and the fan and the it still blows the fuse as soon as I turn the key.
Still working on the system.Any idea's??



 
wagonman100 
Super Senior Member
Posts: 14551
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
05-26-20 02:29 PM - Post#2794904    
    In response to jerryjerry05

You have a direct short to ground on a wire that has power to it with the key on, or it is a switched circuit and the switch is on, You probably pinched a wire changing a component.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2929
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
05-26-20 05:59 PM - Post#2794925    
    In response to wagonman100

Check to see if the wire to the compressor is pinched behind the compressor.
HAve seen this before and it is a instant short.
(The harness side) I say this because you state it even blows with it unplugged.
Is it a 15A in the underhood box?

Old School GM fan FOREVER


 
jerryjerry05 
Newbie
Posts: 4

Reg: 05-26-20
05-27-20 01:52 AM - Post#2794944    
    In response to rockfangd

Now that I think about it? The problem was there before I changed anything.
The fuse under the hood is a 20a that keeps blowing.
In the other fuse panel by the brake it's a 10a.
It doesn't blow.
I'm digging deeper today, the switch on the dash will be checked today.

THANKS!!!!



 
jerryjerry05 
Newbie
Posts: 4

Reg: 05-26-20
05-27-20 02:38 PM - Post#2795001    
    In response to jerryjerry05

Todays results.
Found when the AC switch is turned on it blows the fuse.
I have the comp unplugged, the fan unplugged,motor running, and the fuse blows when I hit the switch for the fan(remember the fans unhooked) it then blows the fuse.
So I'm guessing the switch for the fan is bad?



 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2929
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
05-27-20 03:24 PM - Post#2795005    
    In response to jerryjerry05

Did you check the harness that goes to the compressor? (harness side, not compressor side)
Make sure AC switch is turned off, set controls to dash vents or bi level.
Turn on blower speed and see if it blows.
Does the blower motor work?
If the fuse does not blow turn on the AC.
Does the fuse blow??
AC circuit and blower circuit should not be related.

Old School GM fan FOREVER


Edited by rockfangd on 05-27-20 03:25 PM. Reason for edit: No reason given.

 
junkman104 
Frequent Contributor
Posts: 1525
junkman104
Age: 61
Loc: Murphy N.C.
Reg: 01-25-14
05-27-20 05:38 PM - Post#2795012    
    In response to rockfangd

I had a 05 Silverado 4.3 with a similar problem last year in the shop. I followed the harness from the compressor to the main harness was chaffed and shorted out. I had to peel the plastic guard and tape back to find the short. Worth a look.



 
rockfangd 
"7th Year" Gold Supporting Member
Posts: 2929
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
05-27-20 08:41 PM - Post#2795031    
    In response to junkman104

agreed. That is what I mentioned. I have come across it more than once. Especially if the compressor or something around it has been replaced

Old School GM fan FOREVER


 
jerryjerry05 
Newbie
Posts: 4

Reg: 05-26-20
05-28-20 02:24 AM - Post#2795044    
    In response to rockfangd

I had changed the fan 6mo. ago. Works good.
The blower motor relay worked but only on the 3 and 4 settings. Changed that and the blower and switch work fine.
So I'm guessing the switch for the fan is bad? Or it's grounded somewhere in the harness??
THANKS!!

Gonna look at it this AM , got rained out yesterday.




 
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