mattmee489
New Member
- Joined
- Feb 17, 2019
- Messages
- 4
- Reaction score
- 1
- Your Mercedes
- GL420
Hi All,
I currently have a 2008 GL420 4.0 V8 Diesel and the coolant level constantly needs topped up every time its driven and no one can find the issue. My mechanic has looked and found the coolant cap was broken so it was replaced (didn't work or make a difference). The thermostat was also replaced again it did nothing.
The coolant level only goes down when the car is driven under pressure. If I leave it ticking over its fine. I have even checked to see if the cooling system was air locked but no bubbles appeared after 30 minutes of running.
I am now thinking its a water pump or the dreaded head gasket.
I have also noticed that the coolant system is always under severe pressure even if I leave the jeep for a day or two (this is probably why the first coolant cap broke).
Has anyone ever had a problem like this before?
Any help would be great appreciated.
Thanks
I currently have a 2008 GL420 4.0 V8 Diesel and the coolant level constantly needs topped up every time its driven and no one can find the issue. My mechanic has looked and found the coolant cap was broken so it was replaced (didn't work or make a difference). The thermostat was also replaced again it did nothing.
The coolant level only goes down when the car is driven under pressure. If I leave it ticking over its fine. I have even checked to see if the cooling system was air locked but no bubbles appeared after 30 minutes of running.
I am now thinking its a water pump or the dreaded head gasket.
I have also noticed that the coolant system is always under severe pressure even if I leave the jeep for a day or two (this is probably why the first coolant cap broke).
Has anyone ever had a problem like this before?
Any help would be great appreciated.
Thanks