Question about 1994 Volvo 940

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Just changed head on '98 volvo 940.Coolant keeps

Just changed cylinder head on my '98 volvo 940 turbo 2.3litre.Coolant keeps running low (max-min in a day)with no visible leaks.What;s going on? hugo.

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  • madix941 Nov 01, 2009

    Finally found problem.Coolant was leaking inside car under dashboard at heater connection and hidden under carpet.Bypassed heater by disconnecting hose.



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If you have no leaks you can see, you have a internal problem.
1) Head gasket not sealing off properly
2) Cracked head and/or block
Purchase Block leak tester, for your coolant system and follow instruction. If it test reveals combusting gas in coolant. You will need to pull Cly. head for further testing.

Posted on Sep 28, 2009


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I have a 1991 Volvo 940 Turbo with about 240K on the engine.The water pump was leaking. I drained the coolant by removing the lower radiator hose. I replaced the old water pump (for the first time) with a...

Did you bleed the cooling system after you reinstalled? Chances are high that there are trapped air pockets in the system. Those systems will thump you big time for not bleeding them (sometimes repeatedly) after a water pump change. It's possible, though unlikely, that the head gasket failed. Start by bleeding the system until it is free from air bubbles (heater in car set to max!) and that should take care of it. As for the oil leak, that could be due to the overheating condition you experienced.

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Just changed head on '98 940 volvo.coolant keeps running low with no visible leaks.what;s going on? hugo.

What color is the exhaust? If it is white with a sweet smell to it you are burning antifreeze. In which case you would have to se where you went wrong with the cylinder head replacement.

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Engine oil dipstick shows water and rust mixed in with oil

Everyone always jumps to head gaskets. There are plenty of MINOR things that can be looked at first.
The Volvo 2.3, 2.4, 2.5 Inline 5 Cylinder dipstick tube is known to develop a large amount of condensationin winter months and stop and go driving. What you see on your dip stick is possibly just condensation. Take off your oil cap and look under the cap and inside the valve cover. Is there any thick foamy oatmeal like substance or noticeable amounts of water? If your oil was saturated with coolant, you would be able to see it up there too. Check your coolant for oil. Volvo coolant is typically brown to orange, however make sure there is no sludge. Start the car with the cap off and keep an eye out for alot of bubbles. A large amount of bubbles is a sign of a bad head gasket. A couple here and there is just air in your cooling system.
Coolant, Transmission fluid, and Oil have several places they can mix. If you have a turbocharged Volvo, the seals in the turbo can go bad and cause a mix of oil and coolant. Your transmission cooler is also in your radiator, and if it cracks your transmission fluid and coolant can mix. I believe turbo models have an oil cooler built into the radiator as well.
Overall if your car sounds fine, you dont see oatmeal, your not using coolant and oil in excessive amounts, dont have white smoke, and your turbo isnt whining you probably just have condensation in your dip stick. If you are overly concerned you can send a sample of your oil to a lab and have it tested for traces of coolant. Headgaskets rarely fail on Volvo's, even the old ones....I have seen many that have gone to replace them have not found a failed gasket and end up finding a bad transmission cooler or a bad turbo.

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Probably IS the crank position sensor-classic symptoms. It is hard to reach (of course)-behind head at top of transmission bellhousing.Not a very expensive part-try it.Will the car fire at all? If so,then it may be the IAC-try holding down the gas pedal slightly if it runs,replace this.

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