Problem? Gurgling/Liquid sound at start up - Mercedes Benz SLK Forum
 
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#1 Old 11-18-2009
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Problem? Gurgling/Liquid sound at start up

Ever since my car was new, it has frequently made a gurgling/liquid sound the first few seconds after I start the car. The sounds lasts for just a few seconds, then disappears. I would estimate it makes this sound about 20-25% of the time at start up. To me, it seems as though the sounds is coming from somewhere in the dash. Perhaps the sounds is somehow related to the the AirScarf system?

I recently had the car in for routine service. Unfortunately the dealer stated that they could not duplicate the problem while the car was in for service.

Just wondering if this is a "normal" sound or is the indication of a potential problem. My warranty expires in April, so I'm trying to get any issues resolved prior to then.

Thanks in advance for any help you can provide.
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#2 Old 11-18-2009
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Hi
As far as i know this is normal depending on what setting you left the heater on when you turn the car off.
There is an electric water pump near the coolant bottle that pumps hot water in to the matrix in the dash and that is why the heating system in the car gets warmer quicker than some other types of car.
So if you start the car with the heating on you hear a rush of water as the pump kicks in and starts the flow of water.
Well thats what my dealer told me when i asked the same question.

Hope this helps
cheers pete

p.s guys if this is wrong please correct me as i would like to be sure myself


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#3 Old 11-18-2009
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All I hear is the growl/burble from the rear exhaust. I do have have my analog temp control setting at 76 F for both driver and passenger, with the fan speed at 2.0 (cool mornings in the low 60's) when I satrt the engine and don't hear any gurgling liquid sound coming from the dashboard area.

Eddy



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#4 Old 11-18-2009
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The pump Pete is talking about is used by the rest system mostly, it doesn't play a role in how fast the car heats up, that is a purely a function of the engine temp.

You almost certainly have air trapped in the system, how hot does your car run and what is your coolant level with a hot and cold engine?, try setting the system to full hot for a while then leaving it at that when you shut the car down, check for the noise at the next cold start.
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#5 Old 11-18-2009
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Originally Posted by DansSlk View Post
The pump Pete is talking about is used by the rest system mostly, it doesn't play a role in how fast the car heats up, that is a purely a function of the engine temp.

You almost certainly have air trapped in the system, how hot does your car run and what is your coolant level with a hot and cold engine?, try setting the system to full hot for a while then leaving it at that when you shut the car down, check for the noise at the next cold start.
Now we know why we pay you the "big dollars/pounds" my friend!!
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#6 Old 11-18-2009
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Thanks for the responses. Seems like this sound occurs even in the summer. I'll try your suggestions though and see what happens. Thanks again.
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#7 Old 11-19-2009
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The car doesn't take the time of year into account mate
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#8 Old 11-19-2009
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Quote:
Originally Posted by DansSlk View Post
The pump Pete is talking about is used by the rest system mostly, it doesn't play a role in how fast the car heats up, that is a purely a function of the engine temp.

You almost certainly have air trapped in the system, how hot does your car run and what is your coolant level with a hot and cold engine?, try setting the system to full hot or a while then leaving it at that when you shut the car down, check for the noise at the next cold start.
Thanks for clearing that up dan,my car did this so i asked my dealer to look at it when it had its service.

The above is what they told me and said its normal and nothing to worry about. the car is fine with no problems and no big bill

I can get it to do it if i turn the heater on and turn the ignition on but leave the engine off.
It then goes as soon as the engine is switched on.I disconected the power from said pump and put the heater and ignition on and hay presto no sound of water in the dash.reconect and you hear the water moving
So i guess some of what my dealer said is correct.

many thanks for the help
pete


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#9 Old 11-19-2009
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Well yeah mate it's pushing the coolant around the system, if you remove the power from the pump it will go quiet because its not doing anything

When the engine starts the coolant pump takes over and the car starts to warm up, i would agree on the don't worry front (see below) but air in the system is not really a good thing because it doesn't work as a coolant, the point being so long as it stops then the air ends up in the expansion tank and not flowing around your engine for the entire trip, if you can hear it when you rev a warm engine it needs looking into.

When your car next has a coolant change it will most likely disappear.
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#10 Old 11-20-2009
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Quote:
Originally Posted by DansSlk View Post
Well yeah mate it's pushing the coolant around the system, if you remove the power from the pump it will go quiet because its not doing anything

When the engine starts the coolant pump takes over and the car starts to warm up, i would agree on the don't worry front (see below) but air in the system is not really a good thing because it doesn't work as a coolant, the point being so long as it stops then the air ends up in the expansion tank and not flowing around your engine for the entire trip, if you can hear it when you rev a warm engine it needs looking into.

When your car next has a coolant change it will most likely disappear.
cheers mate you have put my mind at rest,it never made the noise when

warm and the times it did do it was when it had been laid up for a week or two doing nothing so thats a i owe you
cheers again pete


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