Question about 2001 Volvo S40

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Water levels in my S40 T4

I have recently replaced the turbo on my T4 and ever since I have had a problem with the water levels.
There seems to be a slight weep coming from somewhere but when you look there are no signs of leakage. The system has been bled on 2 bleed points for the cooling system is there any that I have missed?
Also when the car has been run whether you leave the engine to cool or not it shows ther is no water in the expansion bottle but when you undo the cap the pressure is realeased and the water levels rise in the bottle again, HELP I am confused as to the problem.

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  • gizmo108 Jun 02, 2008

    My partner was a motor mechanic so the labour costs is not an issue, he has checked that the oil has no water in it and the water has no oil in it just incase is was the head gasket. He seems to have ruled it out, there is no white smoke being ommitted either.


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The thermostat is sticking causeing a back flow in preasure
once released the cap on the bottle the thermostat reset its self and pushed back water into container

ginko is right

but as the first solution lets look at this basic procedure first before you start taring into your engine
find the thermo. house top radiator hose take off thermo house take out therm. and replace with new one

Posted on Jun 02, 2008

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Seems you are in troubles.
The water level rise up when you open the cap because of the pressure and temperature, even if water is far below level this is normal.
If your water is going, and there is no leakage, most common cause is head gasket starting to go.
When head gasket lose her grip and insulation, water circulating in cylinders is vaporized, and water level goes down.
If this is the case ( and probably it is) yopur car will stop for good one of this days.
Another symptom head gasket is going is white smoke from exhaust.
There are liquid testers on the market, they are quite easy to use, you should go to your car part reseller and ask the proper one for your motor, here is an example

Check here for a simple description of the problem.

Here is how the head gasket looks like.

Here is a compression test kit

Head gasket itself it is not an expensive part, but its replacement involves a lot of labor, it is definitively not a job for novices.
Check first that you do not have any external leak, and that water pump is running ok.


Posted on Jun 02, 2008

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