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Discussion Starter #1
Ok, so I am not sure if i am having an AC issue or audio grounding issue...or both.

So here is the deal. I Have an aftermarket stereo. When I first got it, I Had to play around with the grounding points in order to eliminate engine whine noise. I got it perfect then lately it has become really really bad.

So I did some process of elimination and found this.

When I have the radio turned off, then whine is almost completely gone (as anyone would expect)

I just noticed that when I Have the AC on and radio on, the noise is there. In fact the AC is what makes the engine whine noise.

When I turn AC off, have radio on, no whine noise is coming through.

Now the kicker....I turned off the radio and accelerated while in park with AC on and radio off. I can hear a really loud {belt-like} noise coming from the engine. It occurs right at 2,500-3,000 RPM.

It definitely doesn't sound normal. When I drive normally I must have not noticed this noise because of the radio or it's too faint to hear to hear when outside of the garage.

Could it be some sort of tensioner on the AC belt tensioner?

Not sure how this relates to my radio, but they go hand in hand and I would like to fix it.

Thanks in advance.
 

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When I have the radio turned off, then whine is almost completely gone (as anyone would expect)

I just noticed that when I Have the AC on and radio on, the noise is there. In fact the AC is what makes the engine whine noise.
ALMOST gone......a noise through the speaker and it is not 100% gone with the radio OFF ????? :eek:

Anyhow, it sounds like you have a squealing belt; loose or worn or both. The one that runs the AC compressor.

If you also have electrical noise only when the AC is on, that might be one of the radiator cooling fans going bad (brushes arc'ing).

Or your custom grounds could be coming loose too.
 

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Discussion Starter #3
ALMOST gone......a noise through the speaker and it is not 100% gone with the radio OFF ????? :eek:
I didn't mean turn off the radio and the song would still be playing LOL I meant when I put an application on mute, i.e. tv function, BT function, Radio function, Navi function, it would still have a small hiss in the back ground. I know most all aftermarket will have some, but this is definitely bad grounding and causes it to whine when I press accelerator.

I will definitely check the belt. I kind of looked but have no idea how to diagnose a bad belt visually. This noise only is on when I have the AC on so definitely could be the part that wraps around the ac part as you said.

When I turn the radio off (complete power off), all noise is gone of course.

What is the easiest way to diagnose the radiator fan? I Do notice that it has come on more often than last summer...of course this Texas 108 degree weather doesn't help.
 

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What is the easiest way to diagnose the radiator fan?
You set up the noisy condition with the radio and then pull the fan fuse or disconnect the power going to it. If the noise goes away completely, you have a noisy fan motor.

A bridged noise filter on the fan power might help and might be somewhat cheaper than a new fan motor. Could be a corroded connector going to the fan......or a bad ground at the fan too.

If you set the AM radio between stations, is there evidence of other electrical engine noises when the AC is not running, like spark tick or alternator whine ??
 

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Discussion Starter #5
ok got it, I will check that. Have no idea where that power source would be for the fan. :) but ill look

I will try the AM. Pretty sure it's the same with fm and am, but i will try again tomorrow. I did try to compare whether having the antenna connected or not affects the noise...and it didn't.

WHen AC is off, I really can't hear any engine whine noise. I will have to check if there are pops when AC is off - I did notice pops once every blue moon when on GPS --- not sure why GPS, but yeah.

Thanks for the help so far.
 

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Pretty sure it's the same with fm and am,
If that's true, then your problem is coming in through the power line.......as FM is pretty immune to radiated stray signals.

I've been trying to avoid saying this but.......it really sounds like your aftermarket radio isn't engineered very good. :(

There are filters made to be attached to the power input of radios; used mostly by HAMs and other 2-way radios. You need a good ground for that too.

And one last thought: some of these cars have been notorious for bad ground (body) connections on the negative battery cables. That might be a factor too.
 

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Discussion Starter #7
I've been trying to avoid saying this but.......it really sounds like your aftermarket radio isn't engineered very good. :(
Oh I definitely know it could be that; it's a very cheap machine. I just can't see buying an 800 dollar radio for this car. All the features I wanted, it would be about that much.

But I did have it perfect once and for some reason I can't re-duplicate where I had it with absolutely no noise. All the grounds points are the same now so not sure what happened.

Also it could be the placement of the unit, the sonata has basically two ground points to the unit chasis inside the double din housing: one on the bottom part and one towards the back and since the new unit is not exactly the same size as the oem, I had to use pieces of metal to make them touch.

It worked perfect at one point, not sure why it's not now.

If anything, I can live with it, i'll try to further diagnose.
 

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Before tearing up your dash, I would follow Easy Rider's recommendation about the main ground points for the battery and alternator. Those are things that shouldn't be a problem but frequently are!
 

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I had to use pieces of metal to make them touch.

It worked perfect at one point, not sure why it's not now.
Just "touching" is not good enough. There must be a tight connection.

As I said before, you need to visit your grounding points and be sure they are still clean and tight.......and that includes the main grounding points for the battery too.

Screws, bolts and connectors sometimes come loose.
And a connection point will sometimes develop corrosion INSIDE the connection where you can't see it.
 

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Discussion Starter #10
Before tearing up your dash, I would follow Easy Rider's recommendation about the main ground points for the battery and alternator. Those are things that shouldn't be a problem but frequently are!
Ok thanks. Is Easy Rider a company? Or a website forum? I tried to google that but couldn't really find anything on it.
 

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Discussion Starter #11
Just "touching" is not good enough. There must be a tight connection.

As I said before, you need to visit your grounding points and be sure they are still clean and tight.......and that includes the main grounding points for the battery too.

Screws, bolts and connectors sometimes come loose.
And a connection point will sometimes develop corrosion INSIDE the connection where you can't see it.
Ya it looks like I might just have to re open it and double check everything. I have to anyways in iorder to install my headrest dvds, have to plug the two video outs to my unit.

It's 108 outside so I have been dreading doing this. :huh:
 

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Ya it looks like I might just have to re open it and double check everything. I have to anyways in iorder to install my headrest dvds, have to plug the two video outs to my unit.

It's 108 outside so I have been dreading doing this. :huh:
Where are you located? Phoenix?? If so I can probably meet up and take a look at at with you.
 

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Discussion Starter #15
Where are you located? Phoenix?? If so I can probably meet up and take a look at at with you.
Man, thanks for the offer, but i am in texas :(
I wished i lived in Pheonix during summer...i'd take dry heat over this humid heat any day.

I had AC specialists look at my AC because of that noise i was hearing at 3k rpm. The told me nothing wrong with my AC...though i really still hear it when I am in my garage. May upload a video here. Only happens when the AC is on.

I will also try to disconect the fan while car is on and try to troubleshoot from there to see if that could be the problem.
 

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Good idea.
And that is why I frequent this forum lol
:rolleyes:
I've done EVERYTHING to get rid of alternator noise in my azera...

big 3 upgrades, checked and sanded every ground point in the car, added a few more grounds, new battery.

my last 2 options are: alternator itself or headunit.

I even installed a bigger battery lol



 

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I've done EVERYTHING to get rid of alternator noise in my azera...
Alas, most of those things will NEVER have an impact on "alternator" noise, especially if your audio equipment has poor power filtering.

I suggest that it is now time to look at some add-on power filtering instead of just guessing and replacing parts that don't need to be.......and wasting time and money in the process.
 

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do u have an after market amp feeding the speakers or its coming from the head unit?

are u using oem wiring or did u run ur own?
 
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