My 2004 Volvo with 60k mileage has developed a sudden major problem
with the oil finding its way into the water cooling system. I have been told that it could be the head gasket or a cracked cylinder head or block equally the dealer has said that he has not previously come across this problem with this particular engine
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Re: S40 2.0d engine
You said oil? could it be trans fluid because of a bad radiator,if its a auto trans car/yes it could be a head gasket if this car ever had the common bad cooling fan problems,has it been wrecked,has it been overheated,have you owned it from new,/its would be rare to have a cracked block
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unlikely to be engine oil, more likely transmission oil from faulty transmission oil cooler in radiator tank
take it in for a proper diagnosis and quote
the coolant system will have to be properly and completely flushed
A hot running engine is usually caused by a cooling system problem. Make sure the coolant level is full and the thermostat.. rad fan.. radiator cap and water pump are all functioning correctly. Make sure there are no restrictions in front of the radiator to obstruct air flow and coolant circulates properly throughout the radiator. As for losing oil, check for the obvious..... Leaks. If no major leaks and you have a high mileage engine, suspect the oil to be burning within the engine. A constantly hot running engine can also cause the oil to break down quicker resulting in consumption, especially if oil changes are neglected
Re you sure it is engine oil? Or is it transmission fluid? Automatic transmission cars usually have a transmission oil cooler in the radiator. These can crack and leak fluid into the cooling system. It will act quite often like engine oil. It will eventually turn blackish in color because the trans fluid will eat away at the rubber hoses in the cooling system, and turn them into jelly.
The only water in your engine is in the cooling system. Coolant does not belong in the compression chamber so there has been a major breach. Think bad head gasket or cracked head/block. In any event you have a major expensive problem there. Most likely your cheapest way out is to find a used engine, with much lower mileage, at a junkyard. Toyota no doubt put that same engine in many models in many years. Large junkyards have a parts interchange to tell you what years and models and also junkyards have a search system to find you an engine elsewhere if they do not have one.
Volvo Radiator, Thermostat and Sensors
system's temperature controls include all coolant temperature sensors,
Volvo thermostat, Volvo radiator or expansion tank cap, cooling fan(s)
and fan clutch (if equipped). These cooling system parts function
primarily independent of the engine but control the engine either
through cooling or by sending control signals to your Volvo's
The Volvo thermostat is a spring-loaded
valve that opens and closes based on the temperature of the coolant
flowing through it. A high temperature reading followed by a drop to
normal temperature (or a continuously low temperature) is a common
first sign of a sticking Volvo thermostat. However, many other
conditions may cause these symptoms, so you need to know how to
eliminate each possibility.
The Volvo radiator or expansion
tank cap is also a spring-loaded valve reacting to system pressure. It
serves to maintain proper system coolant level at predetermined
pressures. It must always be replaced with an exact replacement cap
with the same pressure setting. Never use other caps except for
A belt-driven fan blade for pulling
air through the Volvo radiator is usually on the Volvo water pump
pulley and should have a fan clutch to control it. The fan clutch
allows the fan to turn with the belt at low engine speed and
"free-wheel" at higher speeds. A bad fan clutch either doesn't allow
the fan to spin at low speed (overheating in traffic) or doesn't allow
it to free-wheel at high speed (potential overheating on highway or
reduced gas mileage).
An electric fan can be either by
itself (usually front-wheel drive) or auxiliary (used with a mechanical
fan). Both types are controlled via a temperature sensor - in the Volvo
radiator or upper Volvo radiator hose or on the Volvo thermostat or
Volvo water pump housing. This sensor is usually an on/off type switch
with a fixed temperature setting. (Some vehicles may have 2-3 settings
for multi-speed fans.) This sensor is commonly called an "auxilliary
Other common temperature sensors are: 1) gauge
sender (variable output); 2) warning light sender (on/off type); 3)
lambda and/or fuel injection sensor(s) (variable to control fuel
injection settings); 4) thermo-time switch (cold start valve control).
Your Volvo may have other sensors as well.
control is critical to both performance and emission control.
Unfortunately, this system is the most difficult to troubleshoot
without proper equipment and diagrams. It's even more difficult with
computers that adjust timing, idle speed, vacuum and fuel delivery
automatically to make up for potentially faulty temperature sensor
Maintenance of your cooling system sensors is
virtually impossible since there's nothing really to "maintain".
Keeping them clean both internally (coolant replacement) and externally
(engine cleaning) is the best way to ensure trouble-free driving.
Checking and replacing all parts at the factory-recommended time or
mileage limits helps as well
The oil cooler tank on the side of the radiator has cracked and allowed oil into the cooling system. Replace the radiator and you will need to flush the cooling system A LOT. and be careful driving it for a while, the mixture can take a long time to clear out of the head which can cause it to overheat.