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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Cooling fan stays onViews : 11266 Replies : 9Users Viewing This Thread : |
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Jan 19th, 2009, 17:12 | #1 |
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Last Online: Jun 15th, 2024 07:15
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Location: Hounslow West London
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Cooling fan stays on
1993 960 24v 214000 mls.
One day this week I found the cooling fan running after I had switched off the engine....well sometimes it does this for about a minute or so; only this time it did'nt switch off and drained the battery. I first suspected the fan relay situated just in front of the battery. I had it off, removed the cover and cleaned up the relay contacts. These are quite easy to get at on this unit but you need a contact burnisher which is nothing much more than a rather dull small file, and finish off with some very fine crocus paper. Put it all back and tested but the fault was still there with the fan still running. Now went to the aircon pressostats which are at the front of the condenser at the bottom, behind the radiator grill. There are three of them here; the outside one is purple and is the high pressure shut off switch, the middle is grey and is the low speed pressure switch and the one closet the center line is brown and is the high speed pressure switch. The grey and brown ones are connected direct to the battery and will operate the fan via the relay independently of the ECM or ignition. By simply removing the connectors in turn I identified the brown high speed switch as being faulty since the fan stopped on removal. Down to the best Volvo agents in London Braydon Motors for a 2nd hand switch and job done. Be careful when you try to remove these switches. There is a Schrader valve between the switch and the aluminium manifold which houses all three switches which alloys you to remove the switch without loosing the a/c gas charge, but you must use two spanners, one to hold the smaller flange nut against the manifold and the other larger one, to unscrew the switch. |
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Jan 27th, 2009, 15:34 | #2 |
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Last Online: Jan 27th, 2009 22:11
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Location: Denver
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Thanks Mjk164,
I’m at the stage where it stays on a few mins after engine is off. Also, when I am coming back from work and am about to turn on the car, the fan starts. Its been very cold here lately and this fan drains the battery just enough to not allow enough power to the starter.. Any idea why it stays on a few mins? I thought perhaps it was doing that to cool down the engine.. but was alarmed when I could hear it doing it before I start it.. and its extremely cold already.. |
Feb 14th, 2009, 21:24 | #3 |
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Last Online: Jun 15th, 2024 07:15
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I think you should check the A/C switches and the bottom of the radiator, accessible from behind the front grill. Follow my previous post and disconnect the brown and purple and grey plugs in turn and if the fan goes off with one of them then you have found the faulty switch. If not then you should suspect the relay (in front of the battery) and try a 2nd hand replacement.
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Jun 12th, 2009, 14:03 | #4 |
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Last Online: Jul 27th, 2009 16:42
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Location: ashford
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v40
hi i've been reading ur blog and started to look for the 3 switchs but i can not find them do i need to take the bummper off to find them can you ley me no thanks ed
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Jun 14th, 2009, 20:32 | #5 |
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Last Online: Jun 15th, 2024 07:15
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Location: Hounslow West London
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Eddy, the blog refers to the 960 (and possibly the 940 as well) and not the V40. These later cars have a different system but will have these switches somewhere, but I am not familiar with the model.
Brgds |
Jun 14th, 2009, 21:16 | #6 |
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Location: ashford
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thanks for the reply not to worry i'll work it out!
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