Home > Td5 > Air Con fan running majority of the time |
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derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539 |
Bit of a strange one on my 2005 Td5 90 with Air Con, the electric fan runs quite often even with the aircon off.
I've researched abit and found if it overheated the electric fan would kick in, and only stop when the fault memory is cleared even if there isn't a fault in the memory. But mine isn't like that, I can clear the memory and even when cold the fan will kick in again. In the parameters it is saying fan requested. So I'm guessing it is getting a signal from the AC even tho its switch off. There is a control type box behind the rotary switches, anybody had an issue with this or a similar issue? Cheers Will 2005 90 XS 1954 86'' Series 1 tilt |
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1st Jun 2023 4:40pm |
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MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 572 |
There is "ECU" inside the AC unit. First try to unplug whole AC. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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2nd Jun 2023 8:47pm |
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derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539 |
Thanks guys, I'll have a look next week, its an odd one, if I put the air con and turn it off again it stops it.
Strange! Cheers Will 2005 90 XS 1954 86'' Series 1 tilt |
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3rd Jun 2023 3:35pm |
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MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 572 |
AC fan (the electric one behind front mask) is powered over a relay controlled from engine ECU. AC ECU is "asking" for this fan over one wire to engine ECU. Disconnecting the AC ECU should stop the fan. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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3rd Jun 2023 9:55pm |
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kzycnn Member Since: 24 Apr 2009 Location: Northumberland Posts: 276 |
I had exactly the same problem some years ago. Followed the same logic but got nowhere. Finally had an aircon recharge and that sorted it - been fine since.
Tony |
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6th Jun 2023 2:25pm |
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derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539 |
That is interesting Tony, It hasn't been re gassed in about 5 years when I fitted a new condenser.
Cheers Will 2005 90 XS 1954 86'' Series 1 tilt |
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7th Jun 2023 1:54pm |
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tommac Member Since: 03 Jul 2018 Location: devon Posts: 26 |
Does the air con function when turned on?
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17th Jun 2023 10:57am |
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derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539 |
Yes air con is working fine, I’ve had the pressures checked and it was 150g down, now topped up to spec and still doing it.
I had it idling earlier for a few minutes with the air con off and the fan kept cutting in and turning off, definitely an electrical fault somewhere. Cheers Will 2005 90 XS 1954 86'' Series 1 tilt |
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17th Jun 2023 9:00pm |
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tommac Member Since: 03 Jul 2018 Location: devon Posts: 26 |
Sounds like an electrical glitch Will. Best the multimeter out to test/fault find!
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18th Jun 2023 8:13pm |
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NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568 |
Check the clutch on the compressor you can cheat it on with a screw driver if you’re careful.
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18th Jun 2023 8:52pm |
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derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539 |
Yep, went for the easy option first and it didn’t work 2005 90 XS
1954 86'' Series 1 tilt |
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18th Jun 2023 9:13pm |
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NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568 |
Some of the wiring is the brown plug attached to the backside of the fuse box under the middle of the dash on the LHS looking at it. Can’t remember much else as don’t see many with it here, or anyone that wanted to pay to fix it
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18th Jun 2023 9:28pm |
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tommac Member Since: 03 Jul 2018 Location: devon Posts: 26 |
I’d start with the relay Will- pull it, test the voltages and clean everything up.
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18th Jun 2023 9:50pm |
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