2006 Mercedes GL420 Coolant Leak

[v1k_10]

The dealer gave me very little information on what the problem was and so I don't really know what the cause was. He said that part came from inside the engine somewhere - but I can't be certain of that.

To be honest, I just want it correctly diagnosed and fixed.

 

[v1k_10]

^^^^^ I was looking to wrap a cloth around the header this weekend and do exactly that - to try and see where the coolant is coming from but have been working all weekend. Will give this a shot tonight.

 

[joderest]

The other test is whilst its running on idle, properly warmed up, are there any bubbles coming into the header tank, there should not be.

 

[v1k_10]

Not looked at it, I will later today. Thank you

 

[joderest]

have you any update on this, have you found the problem

 

[v1k_10]

It's currently on the drive as it's been declared dorm. I ran it for 20 mins yesterday and got the temp up to approx 90C. - nothing, not a leak or coolant warning in sight. Yet if I drive it (which I can't while it's dorm) it will happen within 5 mins...... Total nightmare

 

[v1k_10]

SORN not dorm*

 

[JBell]

To be honest, I just want it correctly diagnosed and fixed.

Where are you based? Someone will recommend a good indy to properly diagnose it

 

[v1k_10]

I'm based near Upminster in Essex.... a good garage would be very good and helpful.

 

[mattmee489]

I know this is an old post but did anyone ever find the problem? I have the exact same issue on a 2008 GL420! At first i thought it was a thermostat but that didn't work and the problem keeps happening, next step is a new water pump then if that doesn't work its new head gaskets and headers. Absolute nightmare. No one can seem to find the problem at all

 

[deadly]

Hello there. Any resolution to your water loss/pressurising issues. Same symptoms on my 420.
Thanks

 

[v1k_10]

Hello there. Any resolution to your water loss/pressurising issues. Same symptoms on my 420.
Thanks

Hi there - this was listed a while ago now, just got a message in my inbox.

I sold the car to a mechanic and spoke to him after selling it - it was a dodgy head gasket. The change apparently fixed it. I wouldn't have minded if I had been made aware before buying it but the car salesperson was a right *!"^ and told me that the car was mechanically sound and charged accordingly!

Good luck with yours mate. There's a test that a mechanic can perform to let you know if it is the head gasket which is cheap and easy to do. Get that done to give you an idea.

 

[deadly]

I have a feeling mines a head gasket. Thanks for your speedy reply.