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Cooling Fan running high all the time

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pdr1966sc
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pdr1966sc

Cooling Fan running high all the time

Post by pdr1966sc » Wed Apr 10, 2019 8:09 pm

This started yesterday/today - the fan runs on high all the time.
I have a known A/C pressure sensor failure/lack of charge in the system but this has been the case ever since I got the car last October.
I an use Vida to command different speeds of the fan, but when I release control from Vida, it reverts to high again.
The Engine Coolant Temp readings in Vida were sensible.
Under normal cool (below 50F, the fan actually - rarely runs at all) - until yesterday when this run all the time started.



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cn90

Re: Cooling Fan running high all the time

Post by cn90 » Wed Apr 10, 2019 9:11 pm



2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

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vonbaron

Re: Cooling Fan running high all the time

Post by vonbaron » Sun Apr 14, 2019 7:31 am

I had this with my 2005 XC70 a few months back. I could control the fan via VIDA, no problem at all.
Then, after a short while of appearing to work well, it would revert back to high speed all the time. At the time, the air conditioning system did not work, and VIDA showed a problem with the sensor or low charge level in the system. So, I went and had the system re-charged and right away, the cooling fan stopped operating at high speed from start up.
Now, the fan works as it should.
If it were the fan controller, then the fan speed would not be able to be changed via VIDA.



pdr1966sc
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Re: Cooling Fan running high all the time

Post by pdr1966sc » Sun Apr 14, 2019 12:24 pm

Thanks Von Baron, I think based on my symptoms and your experience we are talking about a similar problem.
Cold wet and clammy here today, have the car down on my hoist at 'hobby room' will start by putting my gauges on the A/C and likely find that i need refrigerant.
As I agree- if the controller had failed or anything I would not be able to switch speeds and control it with VIDA.
I am only surprised that this is the strategy to run it high indefinitely as left without repair - it is alternator load and wear on the fan.
Will report back after running A/C tests.
Peter



pdr1966sc
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Re: Cooling Fan running high all the time

Post by pdr1966sc » Mon Apr 15, 2019 7:02 pm

OK Following up here, when I put gauges on there was some but not much pressure in the system.
Started up, added one can of R134a and system started cycling - AND - the fan switched off of high down to lower speed.
Cycling and cooling fine now, fan seams normal.

Pete



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Re: Cooling Fan running high all the time

Post by EngineeringBloke » Tue Apr 16, 2019 2:10 pm

That's great Pete. Keep an eye on the pressure to see if it is holding or leaking, or you can just see if the fan running symptom returns in the future.



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abscate

Re: Cooling Fan running high all the time

Post by abscate » Wed Apr 17, 2019 4:09 am

Did you vacuum test the system first? There is no point adding Freon to a leaky System it will be both not green and not save you green at the same time.


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