Freelander 1 Wooshing sound when accelerating behind dash area

Hi,
My Freelander 2004 TD4 auto had whole exhaust changed yesterday.

I now have a strange wooshing air sound when accelerating. Accelerate a little firmly and it starts and as you ease off it stops gradually as the power reduces.

Although no actual extra air is being forced out of any of the internal air vents it sounds like that.
No exhaust smell coming into cabin.

What has happened?

Old exhaust was in bad condition but trying to find horrible metalic scraping sound coming from under car when going over bumps. Thought it was the cat broken up but new exhaust has made no difference. Car been on ramps a number of times but nothing loose underneath etc can be found. Possible suspect is gearbox selector cable rubbing as we were able to stop the sound temporarily by adjusting its position but it is back again now, Only happens when going over bumps - horrible, tinny metal scraping sound. The sound comes from underneath car somewhere under the gear selector, hard to tell exactly.

Will be speaking to garage but any ideas on either problem?

The whooshing will be a split turbo hose.

so just coincidence new exhaust? Front section was replaced connecting to turbo.

traffic0703 said:

so just coincidence new exhaust? Front section was replaced connecting to turbo.

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Could be related, but a whoosh on acceleration is normally an intake-side noise. Perhaps take it back to the garage after checking your turbo hoses.

thanks will do - the whooshing sound seems to be inside the dash area below the windscreen air vents which I could not understand.

You might like to check your coolant system expansion tank bottle - on the drivers side of the engine bay on top of the wheel strut. If it is empty, the sound you are hearing could be air bubbles rushing through the heater matrix under the dashboard. You need to loosen the bleed screw on the top of the pipe in the engine bay as it goes through the bulkhead into the cabin (towards the left hand side of the engine bay) and pour water into the bottle until just water comes out the bleed screw. Then close the bleed screw and top the bottle to the Max mark. Put cap back on bottle and run the engine for a few minutes to circulate the coolant then do the process again to double check.

You should really put a mixture of water and antifreeze in rather than just water. You may be able to get ready diluted antifreeze that you just pour in or get the stuff that you mix (usually 50/50) with water before you pour it in.

If that is the fault, I'm not sure how replacing the exhaust has caused the coolant to drop.

You should check the coolant again after a you have driven the car to make sure it has not dropped - eg you have an actual leak rather than a previous loss. Also again after a few days.

Of course, you may fine the coolant level is fine anyway

Edit: Antifreeze doesn't just stop freezing, running just water damages some parts of the cooling system.

traffic0703 said:

thanks will do - the whooshing sound seems to be inside the dash area below the windscreen air vents which I could not understand.

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I had the same fault - a split turbo hose - and it sounded exactly like the blower fan coming on when accelerating. Very confusing.

GrumpyGel said:

I'm not sure how replacing the exhaust has caused the coolant to drop.

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Not sure where you’re getting this from, GG - are you feeling alright?

It was only a suggestion - what you've quoted was proceeded with "If that is the fault,".

Maybe a cooling system hose was damaged, maybe an induction system hose was damaged - you and I are not with the car. Granted, air in the cooling system is usually described as a gurgling - but wooshing isn't to far removed and looking at the expansion bottle to check its level takes less time than writing this post.

It could be the hose that goes onto the turbo at the bottom as many did not have a clip on it.

Thanks for the replies.
Car now suffering a bad loss of power and a bit of surging as revs pass above 2000 rpm. Driven gently with low acceleration it is ok.

Car back at same garage on Wednesday.

Will I be able to see the turbo pipe connections on driveway without ramps? Strongly suspect something has come off or split during exhaust change.

Thanks

no you need to put on ramps as said it is on the bottom of the turbo.

the issue was caused by split hose located in engine bay.
Thanks for the suggestions