Make a donation

Author Topic: Squeak under load  (Read 3257 times)

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Squeak under load
« on: June 27, 2011, 09:38:48 pm »
Noticed it yesterday on the way back from Inters. If I had AC on and hit the throttle hard, I'd get a squeak. AC off and no squeak. No problems at a steady speed with AC on/off. No problems at idle.

Sounds more like a belt slipping. AC seems to work fine.

Any ideas?

The GTI isn't just a machine. It's very much a living, breathing thing.

Offline tony_danza

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 3
  • -Receive: 112
  • Posts: 3013
  • The voice of objective reason, but mine's best.
Re: Squeak under load
« Reply #1 on: June 27, 2011, 09:40:20 pm »
Condensation off the compressor wetting the belt, causing slip?
Sideways yo!

Offline Top Cat

  • Top cat
  • Just look at my post count
  • ******
  • Thank You
  • -Given: 171
  • -Receive: 335
  • Posts: 8196
  • Almost Jacamo
Re: Squeak under load
« Reply #2 on: June 27, 2011, 10:38:47 pm »
Mice ???.  :star:

Offline bacillus

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 4
  • -Receive: 451
  • Posts: 6329
Re: Squeak under load
« Reply #3 on: June 27, 2011, 10:58:18 pm »
I suppose the obvious question is, did you check the drive belt tension?
Without traction power is nothing!

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Re: Squeak under load
« Reply #4 on: June 27, 2011, 11:27:04 pm »
Mice ???.  :star:
Thought they'd have been fried in the heat!

Bacillus, stupid question but how do I do that? Much of the engine bay is a complete mystery. Though maybe that's why I can't find the mice?

The GTI isn't just a machine. It's very much a living, breathing thing.

Offline bacillus

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 4
  • -Receive: 451
  • Posts: 6329
Re: Squeak under load
« Reply #5 on: June 27, 2011, 11:41:06 pm »
Bacillus, stupid question but how do I do that? Much of the engine bay is a complete mystery. Though maybe that's why I can't find the mice?

If you look on the left side of the engine when looking directly at it you should see two belts, the larger one is the cam belt and the smaller one for the ac compressor. You'll see how much play the belt has when you press it.
Without traction power is nothing!

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Re: Squeak under load
« Reply #6 on: July 01, 2011, 07:40:30 pm »
So to update, yesterday I drove around quite, hard at times, with AC off and no squeak. Turning on AC and driving hard, no squeak initially but after 5-10 mins of AC, you get the squeak. Again, steady 70mph on the motorway is fine, but it happens when you hit the throttle to overtake.

Today, drove around with AC on, got the squeak. Turned it off and initially there was a bit of a squeak but after 5 mins of no AC, there was no squeak when pressing on.

I do wonder whether it is AC condensation related. My problem is where do I take it to get it looked at? Car is now out of warranty by six months.

The GTI isn't just a machine. It's very much a living, breathing thing.

Offline Phathead

  • Always Involved
  • ****
  • Thank You
  • -Given: 0
  • -Receive: 1
  • Posts: 54
  • VAG Nut
Re: Squeak under load
« Reply #7 on: July 02, 2011, 10:12:34 am »
I guess from what you are saying it is a belt/pulley sound that you are getting...chirping/twittering?

Sounds like the a pulley could be worn on the AC belt area. When you turn the AC on you are putting more load on the belt, hence using more fuel, and therefore working the bearings harder within the pulley / tensioner.

If its purely on the AC side of things I would start here and work backwards.....?

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Re: Squeak under load
« Reply #8 on: July 02, 2011, 11:01:35 am »
That's what I thought. If I had to replace anything, would it be just the belt or would anything else need to be replaced?

The GTI isn't just a machine. It's very much a living, breathing thing.

Offline Phathead

  • Always Involved
  • ****
  • Thank You
  • -Given: 0
  • -Receive: 1
  • Posts: 54
  • VAG Nut
Re: Squeak under load
« Reply #9 on: July 02, 2011, 12:37:06 pm »
From what you seem to be describing is a pulley issue.....it's really hard to tell without hearing it myself.... Therefore you are probably looking at a new pulley / tensioner (whichever one is making the noise) rather than the belt.

Depending on how many miles you have done and the state of the belt (cracks in the rubber) it may be worth your time and effort to change the belt at the same time. It'll have to come off anyway to do the pulley.

I had the same problem on mine and it turned out to be the tensioner. I dropped a bit of talc on to the belt. If the noise disappeared then it was more likely to just be the belt. The talc will mask a shiny/worn/wet belt for a short period of time. With talc applied the chirrping was still there.....time to check the pulleys.

Offline gtlee

  • Always Involved
  • ****
  • Thank You
  • -Given: 9
  • -Receive: 14
  • Posts: 369
Re: Squeak under load
« Reply #10 on: July 02, 2011, 12:45:01 pm »
Golf V 5DR DSG GT Sport,,Xenons,Full leather,18'Charlestons,Lux pack,storage pack,folding mirrors,front armrest, retrofited--mk5 gti  grilles,fog lamps grilles,GTi rear bumper,coloured coded sideskirts, VIM RNS-510 C,MK6 MFSW with paddles,GTi DSG gear lever,Cruise control,Highline.Rain sensor with window auto closure,TPMS.7P6 Bluetooth.

Mods to come: RVC, and.................

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Re: Squeak under load
« Reply #11 on: July 02, 2011, 12:53:47 pm »
It's only a 57-plate with 28k on the clock so surprised it's shown up this early. Had better get it looked at.

The GTI isn't just a machine. It's very much a living, breathing thing.

Offline Phathead

  • Always Involved
  • ****
  • Thank You
  • -Given: 0
  • -Receive: 1
  • Posts: 54
  • VAG Nut
Re: Squeak under load
« Reply #12 on: July 02, 2011, 10:21:30 pm »
It's only a 57-plate with 28k on the clock so surprised it's shown up this early. Had better get it looked at.
Mine is only a 07 plate with 31k on the clock.....I don't think it's uncommon from reading the forums.

Offline stealthwolf

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 306
  • -Receive: 291
  • Posts: 7835
  • ED30 No.1412
    • Email
Re: Squeak under load
« Reply #13 on: July 18, 2011, 08:57:32 pm »
So I got it checked out and turns out it's the boost going through the recirc valve and it's normal. It started happening after the boost was turned up to 8 and turning it back to 7 seems to have settled it.

Now it looks like the coilpacks are misfiring.  :fighting:

The GTI isn't just a machine. It's very much a living, breathing thing.