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[DK MV6]

Hi again.

Still a rather new owner of a Omega MV6 from ´95. A thing puzzles me.. When i get home ( i live near the freeway ) and i pull up in my driveway and turn the engine off. The fan doesnt start eventhough the car is hot, so hot that the coolant hoses pressurize and gets rather hard. When i put the keys back in the ignition and turn to ACC i can see the temp gauge is around 100 degrees.
Ofcourse if i start the engine and creates flow again the temp falls.. But shouldnt the fan start even if the car is turned off and the keys are out the ignition.? Are these cars equipped with an electric waterpump to circulate the coolant when the car is turned off?

Best regards
Jacob

[TheBoy]

If the rad temp switch is high enough, low speed fans run to cool rad.  This does little for engine though.  Engine heat soak will see dash gauge rise towards 100C - thats normal.  As soon as engine started, should drop within seconds to mid point on gauage

[Teebee]

Don't know if this applies to the early models but when I pull up and remove the keys my electric fans continue to run for a couple of mins. Assuming you have electric fans i'd be looking to why they don't run on as a start, sorry I cant be more help.

[DK MV6]

the car has electric fans-. And they do start at around 95 degress when the engine is running. But i wonder why they dont start when i remove the keys if the car coolant is hot. i believe all my other cars has started the fan by itself. I know it wont do much as there is no flow because the waterpump doesnt run. Thats why i asked about the electric / aux waterpump.

the thing that really concerns me is the hard coolant hoses.

[unclelicklug]

My twopennorth...
Heat soak, as has been said is normal, and hence potentially pressure rise but assuming your radiator cap is working correctly I guess the pressure rise will not be outside acceptable limits, otherwise the pressure cap should relieve, which would be very noticeable.
Worst case of pressure rise I can think of would be localised boiling somewhere, not sure where this might occur...pressurisation of the cooling system helps to keep system boiling point > 100ēC.
Are you losing any water?

FWIW my 2002 2.2 DTi usually runs the fan for a while after a run in summery weather, I think the fan runs at slow speed for this stationary/engine stopped cooling phase.

True enough without the water pump running this is not helping the engine much but there should be a bit of water flow from thermo-syphon effect.

[tidla]

Hi again.

Still a rather new owner of a Omega MV6 from ´95. A thing puzzles me.. When i get home ( i live near the freeway ) and i pull up in my driveway and turn the engine off. The fan doesnt start eventhough the car is hot, so hot that the coolant hoses pressurize and gets rather hard. When i put the keys back in the ignition and turn to ACC i can see the temp gauge is around 100 degrees.
Ofcourse if i start the engine and creates flow again the temp falls.. But shouldnt the fan start even if the car is turned off and the keys are out the ignition.? Are these cars equipped with an electric waterpump to circulate the coolant when the car is turned off?

Best regards
Jacob

location??

[unclelicklug]

Location..

My guess was Denmark... from the user name....

[DK MV6]

Denmark yes.
Is not because of a severe Clima zone. I recently had an oil cooler leak into the cooling system, wich was not discovered untill the water in the header tank had turned into thick mayo. So i have been flushing the system around 20 times since the oil cooler replacement and the coolant is almost 100% free from oil now. ( clear water when drained. Just a small oil burb from time to time wich i think is because there still is some residues in the heater matrix . )
So all this flushing and sqeezing coolant hoses made me do alot of work around the cooling system , hence why i discovered the coolant hoses getting hard after engine shutdown.

On a sidenote... I did remove the rubber gasket inside the header tank cap as it grew to large because of the oil. But the filler cap seals perfekt and i have made sure that none of the two "valves" in the filler cap is stuck.. So it should have anything to do with the cap.
The temp gauge in the dash does move a bit when driving , from 90-95 degrees swinging back and forth and thats not dependant of speed or anything. The electric fans never have to start while driving..

[neilr]

I had this on my 95 2.5 it turned out to be a fuse in the fuse box thats next to the battery. A white 20 amp iirc.