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Posted

A hissing noise appeared today, sounding like it is coming from the centre console.

 

Only there when the engine is running, but stops for a sec when accelerating, but only under load.

 

Brakes feel fine, power seems ok (difficult to check in traffic), switching to petrol doesn't stop it. Headlight adjusters (Merc vans are vacuum powered) work, radio was unplugged!

 

Must be something vacuum related, but are there any likely places I should start looking? Considering the crap weather, I'd like to just lift the bonnet and see the problem instantly :(

 

 

:huh: If only Fredt was here :(

Guest vr6galaxy
Posted

recirc button on the fan speed control pushed in? this part of the switch is vacuum controlled check the fan speed and noise increases when the switch is operated? if it doesnt the switch is duff or the hoses have popped off hence the sucking sound!

 

 

radio was unplugged!...................could have disturbed the hoses :huh:

Posted

But the radio was unplugged to make sure it wasn't FM mush :o

 

I very rarely use the recirc button, until the bad weather last week :P

 

 

Am I right in thinking that if I select recirc and the pipe is off, I won't get the increase in fan noise?

 

 

Just plucking up the courage to face the weather now, thanks for your help

Posted

Looks like I nead a new fan control switch. All the connectors are ok on the back of the controls, but when I push the fan switch in to recirc, the hissing stops.

 

Once again, the hero of this board comes to the rescue, thanks mate.

 

Anyone know a source of a (cheap) switch? GSF don't list it.

Guest vr6galaxy
Posted
Dealer part only or breakers yard, I took mine apart and cleaned it, re greased it and it still hissed failing to operate the flap :o so I had to bite the bullet at the dealers
Guest vr6galaxy
Posted
You do realise that you can swap this switch out via the front of the mounting panel? no need to strip out half the dash to get at it! B)
Posted
You do realise that you can swap this switch out via the front of the mounting panel? no need to strip out half the dash to get at it! :huh:

Not if you've got chubby bass player fingers like mine B)

 

I might have a go, but it's not too big a job to strip it out.

 

Got the rear pads & discs to do next month, might pay one of the chimps (sorry, Mercedes Benz trained technicians) to do it for me.

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