v70 2.4 2005 cooling fan run only at 105 Celsius
-
jimmy57
- Posts: 6694
- Joined: 12 November 2010
- Year and Model: 2004 V70R GT, et al
- Location: Ponder Texas
- Has thanked: 4 times
- Been thanked: 320 times
Re: v70 2.4 2005 cooling fan run only at 105 Celsius
Coolant water mix has a slight boiling point elevation. The pressure cap is what gives you the big increase. Cars with the 105C fan on can boil over with a cap that doesn't seal or if the cap is off and you allow it to idle a/c off long enough.
-
draser
- Posts: 790
- Joined: 18 August 2011
- Year and Model: 2005 S60 2.5T
- Location: Detroit MI
- Been thanked: 2 times
The cooling system is closed and becomes pressurized at engine operating temp - that raises the boiling point of coolant (the pressure). Mixing antifreeze simply lowers the freeze point of coolant (than water alone) among other things.
2005 Volvo S60 2.5T, Zimmerman/Akebono brakes
2012 Honda Accord, EBC slotted rotors
2012 Honda Accord, EBC slotted rotors
then I can walk with my volvo insurance????...your cars work the same way?....the dealer .... they said the fan had 7 different speeds.....then...I've only seen one speed and another speed when I put the ac....this is a mistery.....
-
mikealder
- Posts: 817
- Joined: 25 October 2009
- Year and Model: V70 2000
- Location: Blackpool
- Been thanked: 13 times
There is nothing wrong with your car the cooling system is working exactly as intended.
As has been said the system is designed to run at a temperature above that of boiling water, the pressure in the system is what stops it boiling, this is why it is dangerous to remove the expansion bottle cap, the system looses its pressure and the coolant instantly boils escaping out of the top of the coolant bottle.
The fan should be on when the air con is on, if the air con is off the radiator fan will come on at low speed when the engine reaches 106 DegC, it will go off in the mid 90's if for any reason the engine temp continues to rise above 106 Deg C when it hits 114 Deg C the fan goes to high speed, only when the temperature gets to 117 DegC does the temp gauge on your dash start to go slightly above the normal reading.
Stop looking for faults that don't exist and seek a different dealer as the one selling you parts doesn't know much about their own products if they are claiming a twin speed fan has seven different speeds - Mike
As has been said the system is designed to run at a temperature above that of boiling water, the pressure in the system is what stops it boiling, this is why it is dangerous to remove the expansion bottle cap, the system looses its pressure and the coolant instantly boils escaping out of the top of the coolant bottle.
The fan should be on when the air con is on, if the air con is off the radiator fan will come on at low speed when the engine reaches 106 DegC, it will go off in the mid 90's if for any reason the engine temp continues to rise above 106 Deg C when it hits 114 Deg C the fan goes to high speed, only when the temperature gets to 117 DegC does the temp gauge on your dash start to go slightly above the normal reading.
Stop looking for faults that don't exist and seek a different dealer as the one selling you parts doesn't know much about their own products if they are claiming a twin speed fan has seven different speeds - Mike
-
jimmy57
- Posts: 6694
- Joined: 12 November 2010
- Year and Model: 2004 V70R GT, et al
- Location: Ponder Texas
- Has thanked: 4 times
- Been thanked: 320 times
The fans on any of the volvos with the cooling fan control module located just above fan motor or integrated with the motor do not have just 2 speeds. Relay systems are two speeds. I'm not sure anyone can tell for sure what the speed count is. It is theoretically infinite but if the software has 7 discrete signal characteristics it sends to the fan module then it could have 7 speeds. The fan modules are transistor power stages (amplifiers) and the current control is set by the input signal within the limits of the min and max capacity of the circuit. The speed increments are minor and one increment would hardly be noticeable if you were not watching a voltmeter registering the fan voltage or an ammeter measuring the motor current.
If you look at different year models and even within the same year models, the software for fan control can vary depending on the software version loaded into the ECM.
The MAIN point here is that the car is fitted with a large surface area radiator. Aircon use in hot weather is assumed as it is the safest situation for driver alertness. If aircon is not used then even 10 km/hour travel speed pushes enough air through radiator that the fan would likely not run. If you get caught sitting still in traffic the fan will run before the engine reaches a temp that is not safe. There is an assumption that if it is 40+C outside you wouldn't be sitting still in a car with the engine running burning fuel for no reason. If you want the fan to run at lower temp when aircon is not on and you want to let the car sit for long periods of time idling and burning fuel for no reason then you will have to find someone who can adjust software data points for triggering fan.
Your fan is working as VCC engineered it to work on models as of 2002 or thereabouts (I forget which year they increased coolant temp fan on values to the 105C level).
What is a common failure is that the tank cap cracks and leaks and the system will not hold high enough pressure to not boil before the fan comes on when a/c is off. The system can hold no pressure due to a fault and if the aircon is used 100% of the time the system will rarely boil out any coolant as the aircon need for condenser airflow will push much more air over the radiator than is needed to keep engine cool.
I'm not sure there has been any listing of any problem you have with your car in this thread, just that you believe the temp gets too high before fan runs since you have a way to see the exact value from ECT sensor.
If you look at different year models and even within the same year models, the software for fan control can vary depending on the software version loaded into the ECM.
The MAIN point here is that the car is fitted with a large surface area radiator. Aircon use in hot weather is assumed as it is the safest situation for driver alertness. If aircon is not used then even 10 km/hour travel speed pushes enough air through radiator that the fan would likely not run. If you get caught sitting still in traffic the fan will run before the engine reaches a temp that is not safe. There is an assumption that if it is 40+C outside you wouldn't be sitting still in a car with the engine running burning fuel for no reason. If you want the fan to run at lower temp when aircon is not on and you want to let the car sit for long periods of time idling and burning fuel for no reason then you will have to find someone who can adjust software data points for triggering fan.
Your fan is working as VCC engineered it to work on models as of 2002 or thereabouts (I forget which year they increased coolant temp fan on values to the 105C level).
What is a common failure is that the tank cap cracks and leaks and the system will not hold high enough pressure to not boil before the fan comes on when a/c is off. The system can hold no pressure due to a fault and if the aircon is used 100% of the time the system will rarely boil out any coolant as the aircon need for condenser airflow will push much more air over the radiator than is needed to keep engine cool.
I'm not sure there has been any listing of any problem you have with your car in this thread, just that you believe the temp gets too high before fan runs since you have a way to see the exact value from ECT sensor.
-
- Similar Topics
- Replies
- Views
- Last post