Question about 2005 Mercedes-Benz Mercedes Benz E320 Cdi

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Mercedes-Benz e230 air pocket in cooling system

Had head gasket replaced, now no heat - shop said it's an air pocket - drive it to clear it up - 400 miles & 1 week later, still no heat - ???

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The shop is responsible for this. Driving it won't get the air out. There is a tool required to fill the cooling system and bleed out the air. If your 'mechanic' is really what he claims to be he should know that.

Posted on Apr 18, 2014

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How to remove air pockets in the cooling system.


When you have air in your cooling system, check for leaking gaskets. Most of the time the head gasket is leaking. and it is just a matter of time the whole gasket blows out. It will cost you because the engine needs revision, once the head gasket blows. Don't drive till a tech has checked your engine.

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MY CAR OVER HEATS. I CHANGED THE WATER PUMP BUT IT STILL GETS HOT. THE WATER ALSO LOOKS VERY DARK


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1. leaks in the radiator / water hoses. have a radiator expert check your cooling system. water hoses are quite easy to replace. some would recommend replacing your radiator, some will suggest have it overhauled. if the price is almost the same, the go with the new radiator.
2. busted head gasket. this problem is not that serious, but needs immediate attention. due to blown head gasket, some oil and water that is circulating around your cylinder head will mix, thus the dark color of your water
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I assume you have checked the cooling system to ensure that first, that it is completely full of coolant (not just the overflow tank) with no air locks and second that there are no leaks anywhere and the radiator cap is in good condition. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use. Both cooling fans operate together on most larger cars.

If there are no leaks or air locks, the over heating could also be caused by a clogged radiator (more than 15% restriction in the radiator flow capacity will cause overheating problems), a faulty water pump or a faulty thermostat.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap.

If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.

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Over heating


hi
maybe your had a blown head gasket .try pressurized your cooling sytem about 40psi wait 5 mins if pressure drop in mins you have blown head or leaks cooling system or try changed your thermostat

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This particular model suffers with head gasket problems. I have had to replace head gaskets on several of these vehicles to solve the overheating problem. The two cylinders in the rear of the engine are the problematic ones. The head gasket goes bad in that area which sends combustion gas into the cooling system. This then creates air pockets which in turn causes the engine to run hot. The air pockets then shift and as water starts to circulate again, the temperature goes back down. This cycle repeats over and over.
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