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Author Topic: Radiator fans  (Read 1105 times)

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Entwood

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Re: Radiator fans
« Reply #15 on: 06 August 2018, 11:55:16 »

I printed this out from the old site :

http://oldsite.omegaowners.com//forum/YaBB.pl?num=1280081141

That's the diagram I referred to .. :)

Also here ...

http://www.omegaowners.com/forum/index.php?topic=133825.0

(Thanks to DG or finding it !!  :) )
« Last Edit: 06 August 2018, 11:56:52 by Entwood »
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BazaJT

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Re: Radiator fans
« Reply #16 on: 11 August 2018, 13:59:11 »

Done fan test today with following results
IGN OFF
FT1 +ground-fans worked as per guide
FT2 +ground-fans worked as per guide
FT4+ground-no fan operation at all
FT5+ground-no fan operation at all
IGN ON
FT2+ground-fans worked as per guide
Tested 1,4 and 5 with same results  as for FT2
I did this test a total of 4 times just to be sure of my results and they were the same on every try.
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Doctor Gollum

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Re: Radiator fans
« Reply #17 on: 11 August 2018, 21:48:12 »

Swap Relays K26/67, retest and report back :y
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BazaJT

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Re: Radiator fans
« Reply #18 on: 12 August 2018, 10:47:19 »

Printing in fan test guide is not exactly clear for relay numbers but I've been to car again.Underside of relay box lid is of no help being numbered 1-20 then jumping to 27 and highest number of 40,so basically I've guessed it for now and swapped two green relays which are side by side[one set slightly lower than the other]I felt safe swapping these as both have the same numbers etc on their tops.Assuming these are indeed K26 and 67 then there was no change from yesterdays results,with FT4&5[ign off]producing no effect on the fan whatsoever.On all the other tests I can here the relay clicking but not on those two.On one test-I forget which one-a fan starts that's in or near the relay box which presumably is a cooling fan for the ECU that's in there?But this only happens on one of the tests the rest of the time it doesn't operate does that sound correct?
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Doctor Gollum

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Re: Radiator fans
« Reply #19 on: 12 August 2018, 11:11:26 »

OK, thermoswitch is knackered. Replace, retest and report back  :y

It's the one immediately below the top hose...

Did you confirm the aircon working BTW?
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BazaJT

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Re: Radiator fans
« Reply #20 on: 12 August 2018, 17:03:38 »

It's tempting to say thermoswitch can't be toast as both of those were new not long ago when new radiator was installed.However it's no good categorically ruling it out as it could be a faulty one, so I'll get another and try that.Aircon doesn't work.
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Doctor Gollum

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Re: Radiator fans
« Reply #21 on: 12 August 2018, 17:47:20 »

Bridge the aircon relay, then retest :y
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BazaJT

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Re: Radiator fans
« Reply #22 on: 12 August 2018, 18:09:48 »

Which one's the aircon relay?
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Doctor Gollum

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Re: Radiator fans
« Reply #23 on: 12 August 2018, 18:13:34 »

Read the map... Haynes wiring diagram or in the FAQ section  ::)

K60 bridge 30 and 87.

As said eons ago when you first asked, if the aircon doesn't work, then the fans won't.
« Last Edit: 12 August 2018, 18:19:43 by Doctor Gollum »
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BazaJT

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Re: Radiator fans
« Reply #24 on: 12 August 2018, 18:14:46 »

BTW just to be clear I'm not bothered about the aircon working or not I just need to know that should the need arise the front fans will fire up to help the rear one cool the engine although hopefully the rear one should cope on its own in that regard.
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BazaJT

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Re: Radiator fans
« Reply #25 on: 12 August 2018, 18:27:19 »

Ah,wait a minute just checked in FAQ and the diagram/relay list shows K26 to be number 7 in the box and grey in colour with K67 being number 4 and dark blue.So basically I swapped the wrong relays this morning :-[-both were green and side by side not separated by other relays.Will have to swap the grey and dark blue ones and re-test.
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Doctor Gollum

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Re: Radiator fans
« Reply #26 on: 12 August 2018, 18:37:48 »

Ah,wait a minute just checked in FAQ and the diagram/relay list shows K26 to be number 7 in the box and grey in colour with K67 being number 4 and dark blue.So basically I swapped the wrong relays this morning :-[-both were green and side by side not separated by other relays.Will have to swap the grey and dark blue ones and re-test.
I have misled you :-[ K26/67 aren't interchangeable.

I do have spares of both if required.

Bridge the aircon relay and retest the fans. K67/87 should be interchangeable to rule out K67 :y
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LC0112G

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Re: Radiator fans
« Reply #27 on: 13 August 2018, 10:38:21 »

From Haynes, circuit diagram lines 749-775 on a late model X30XE.

Grounding FT1 energises Relays K26 & K48.
Grounding FT2 energises Relays K28 & K48.
Grounding FT4 energises Relay K67
Grounding FT5 energises Relays K28 & K52

K26 is protected by fuse F50
K28 is protected by fuse F40
K48 is protected by fuses F15 & F50
K52 is protected by fuses F15 & F52
K67 is protected by fuses F15 & F42

From what you say does work, K26, K28, K48, F40, F50 & F52 are probably Ok. That leaves K52, K67, F15, F42.

If FT4 doesn't work, measure the voltage on the FT4 pin. It should be +12V with the ignition on in position III. If it's not, then either relay K67 (coil open circuit) or fuse F15 (blown) are toast. If it is 12V, then the coil and fuse are in tact, so shorting it to ground should then energise K67. If the main fan then doesn't run full speed then either relay K67 (switched contacts burnt out) or fuse F42 (blown) are toast. None of this requires working A/C or working radiator thermostats.

FT5 is more complicated, but on the principle that a single fault is much more likely than two unrelated faults I suspect fixing FT4 will fix FT5. If it doesn't then report back after you've got FT4 working.
 
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LC0112G

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Re: Radiator fans
« Reply #28 on: 13 August 2018, 11:26:20 »

Just been to test on my car - a 2001 Y reg X30XE Elite Saloon. The info on the Terry Wong Catera diagram is wrong for FT4 and FT5. What Baza is reporting looks to be correct for IGN off.

IGN off:
FT1 = +12V, shorting to ground draws 310mA, all 3 fans run slow
FT2 = +12V, shorting to ground draws 290mA, all 3 fans run slow
FT3 = 0V (don't short to ground though)
FT4 = 0V, shorting to ground has no effect
FT5 = 0V, shorting to ground has no effect
FT6 = 0V

IGN on - in Position II, must be position II, not position I.
FT1 = +12V, shorting to ground draws 310mA, all 3 fans run slow
FT2 = +12V, shorting to ground draws 290mA, main fans run slow, both Aux fans run fast
FT3 = +12V, (don't short to ground - that will just measure the amount of smoke left in the wires)
FT4 = +12V, shorting to ground draws 140mA, main fan on high, other fans off
FT5 = +12V, shorting to ground draws 310mA, Aux 2 on high, all others off
FT6 = 0V

It looks like each relay takes 140-150mA to energise the coil. Therefore one relay on = 140-150mA, two relays on = 290-310mA.
« Last Edit: 13 August 2018, 11:28:29 by LC0112G »
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BazaJT

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Re: Radiator fans
« Reply #29 on: 14 August 2018, 21:07:34 »

Retested today[with an assistant cross checking fans]and got the results as detailed above by LCO112G.Changing relays K67 &K87 produced no change in these results.Bridging 30&87 on K60 produced no response from the fans.So it would seem that both LCO112Gs and my results coincide but both are at odds with the test guide for ign off FT4 &FT5 results ???
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