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ae_cowley
Junior Alfisti
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| Posted: 01 May 2006 at 18:49 | IP Logged
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Hi
I hope that someone can help.
The radiator fan on my 156 TS isn't starting up. I've checked that voltage is getting to the fan and started the fan by direct connection to the battery. I can only assume that the problem is in the "switched earth" side. I've swapped the fan 1 relay over but no improvement.
Anybody have any ideas ?? Could it be the sensor ?? where would that be??
Any help would be greatly appreciated.
thanks
Andy
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Nayab
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| Posted: 01 May 2006 at 18:58 | IP Logged
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Hi Andy, welcome to the forum. DavidC will be along any minute to answer this. Looks like you have already checked the relay which is sensible. Not sure what else to suggest.
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brid_dave
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| Posted: 01 May 2006 at 19:02 | IP Logged
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try the resistor which is located on the fan cowling.
if your car has aircon they are a known failure which means that the low speed fan tends to fail.
if it is, the part number is 46533716 and they cost about £15 from the dealers
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David C
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| Posted: 01 May 2006 at 19:02 | IP Logged
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The "switched earth" side is via the engine ECU.
The fans can be triggered via the ECU with Alfadiag or the official Examiner system.
There is no temp sensor for the fan, it is all done via the ECU using inputs from the coolant temp sensor (on the thermostat) and the cyl head temperature (on the back of the engine).
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156 Selespeed sp3 + Brembo conversion
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Black Beauty
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| Posted: 01 May 2006 at 19:19 | IP Logged
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Here you go:
Edited by Black Beauty on 10 October 2008 at 10:07
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David C
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| Posted: 01 May 2006 at 19:24 | IP Logged
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You can test all the relay circuits by running a temp cable from pin 86 on the relay to earth, it should run the fan (high or low speed depending on which relay you do it on).
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David C
156 Selespeed sp3 + Brembo conversion
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brid_dave
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| Posted: 01 May 2006 at 19:27 | IP Logged
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where's the relays located for the fans (both speeds)?
Edited by brid_dave on 01 May 2006 at 19:27
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David C
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| Posted: 01 May 2006 at 19:28 | IP Logged
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brid_dave wrote:
| where's the relays located for the fans (both speeds)? |
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Usual place, in front of the battery.
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David C
156 Selespeed sp3 + Brembo conversion
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ae_cowley
Junior Alfisti
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| Posted: 02 May 2006 at 20:02 | IP Logged
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Hi
Thanks for the advice.
Will replace the resistor to see if it helps before investigating further. Finally, any idea what temp the fast fan should come on at?? I'm told it's 90 deg C for the low speed.
Andy
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Black Beauty
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| Posted: 02 May 2006 at 23:41 | IP Logged
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Lo speed 98
Hi speed 103
Edited by Black Beauty on 20 May 2007 at 00:26
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Nayab
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| Posted: 02 May 2006 at 23:43 | IP Logged
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Time to have a go at fixing low-speed fan then huh?
I peak at 105 temp before the hi speed fan kicks in. getting on my nerves.
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Jabb
Junior Alfisti
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| Posted: 29 August 2008 at 14:58 | IP Logged
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Any chance someone can repost the pictures of where the resistors are? I have just bought a new resisitor but can't find where it goes. I might just run the risk of sounding a bit thick here but any help is appreciated!
Cheers
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Alfa Romeo forum : Technical (156)
Topic: 156 Cooling Fan not working
