Question about 2006 Peugeot 604

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Oil in water expansion tank

Checked water yesterday looked like slight oil sitting on top of water in expansion tank, also thick sludge under cap an in the bottle!! What could this be?? No loss of power, starts drives runs perfect, oil looks fine aswell no cream nothing??

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Have oil in header bottle on peugeot expert 1.9 no


On a diesel this problem is often associated with a faulty oil cooler. Given you have no loss of power and no overheating I would be inclined towards this as an initial diagnoses.

The other possibility of course is head gasket failure as oil in header is a classic symptom. Your problem will require further diagnostics but will ultimately be traceable to one or the other of these.

Thanks for using FixYa.

Posted on Oct 04, 2009

  • 661 Answers

SOURCE: peugot 405 estate diesel turbo n reg

Well not to worry as I am sure there is some water in there. The deal is oil is lighter then water so it floats to the top.
The bad news is you have a blown headgasket. It is the only place in the engine where oil and water come close to each other and are sealed. Well either that or a engine block defect which I would say would be extremely rare. 1 in 100 million rare. Headgaskets going bad are not rare but rather common.

Posted on Apr 16, 2010

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SOURCE: I have a Peugeot 206. Wen I start my engine in let

only one thing will cause this and thats a head gasket ,check the thermostat by running engine and making sure the top and bottom hoses are hot if only the top hose is hot then its a thermostat .If both are hot then tis a gasket and if this is the small petrol version then it take about a hour and a bit to remove the head ,skimmed if needed then refitting which takes a bit longer owing to cleaning all teh bit up and change the timing belt whilst your doing it as they are so cheap for this engine about 25 euros thats all.Have you bled off the cooling system as some vehicle have a bleeder on the heater hose at the back of the engine .With my head under the bonnet i could soon sort out the problem in 5 mins and tell you whats wrong but from afar its difficult to say the least

Posted on Aug 18, 2011

  • 1243 Answers

SOURCE: warning light

need to check the coolant level. also check the engine for overheating.

Posted on Jun 15, 2012

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SOURCE: red light on dashboard

check the coolant level and for engine overheating.

Posted on Jun 15, 2012

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hi my name is paul
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regard paul

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