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Subject Topic: DIY low speed fan test. Post ReplyPost New Topic
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Black Beauty
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Posted: 20 November 2007 at 00:31 | IP Logged Quote Black Beauty


Its common for the low speed function of the fan to stop working therefore allowing the engine temp to run > 90 deg C

The 'LO-Speed RESISTOR' is located at the top of the radiator, nearest the battery

Try removing the resistor, check the connections & the resistance of it ... should be 0.3 ohmns

if it looks excessively burnt or shows an open circuit then replace it.

alternatively as a test try this:

1. car in netural, start the engine

2. leave the key at MAR position

3, disconnect the temp sender at the thermostat

4. watch the fan, after approx 2 seconds it should rotate at a low speed

5. after another 2 second sit should rotate at a much higher speed

if it only rotates at ONE speed then thats most likely to be the HIGH speed, confirming the low speed resistor is burnt out....

Edited by Black Beauty on 10 October 2008 at 10:39
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Chris155
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Posted: 20 November 2007 at 02:04 | IP Logged Quote Chris155

*make sure the air con is switched off.....
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Gweg
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Posted: 20 November 2007 at 13:45 | IP Logged Quote Gweg

*Don't panic if your engine management light comes on, it'll go away again after a few starts

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daveg360
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Posted: 20 November 2007 at 14:03 | IP Logged Quote daveg360

When you 0.3ohms BB - was it exactly that? or is that the resolution of your meter? I can easily get a 0.22ohm resistor for a couple of quid - I wonder how much juice the fan pulls? I expect a 200w rated resistor would be fine though - the biggest twin fan setup pacet do, is ~183w

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Black Beauty
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Posted: 20 November 2007 at 19:02 | IP Logged Quote Black Beauty

i didn't meausure // thats the nominal resis valuve of it +/- ??%

the wattage is very important too .... a lesser resistance will make the 'lo speed' faster
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Black Beauty
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Posted: 10 October 2008 at 10:48 | IP Logged Quote Black Beauty

Coolant fan circuit diagram for a TS engine:










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gazza82
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Posted: 10 October 2008 at 12:55 | IP Logged Quote gazza82

By jumping the connections to the resistor, you can force the fans to run on high speed only at both stages. Can only test if engine up to temp, but if the resistor has failed, this is an easy fix while waiting for the part as it means you have a fan. NOTE: When my resistor failed recently it prevented BOTH fan speeds from operating

A short section of cable with two MALE spade terminals is ideal ... and small enough to keep in the glove box for emergencies.

Think I might start selling them as an "Emergency Fan Kit" for mega-bucks on ebay!!

Edited by gazza82 on 10 October 2008 at 12:57


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sashsanev
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Posted: 02 September 2011 at 21:14 | IP Logged Quote sashsanev

'LO-Speed RESISTOR' is located at the top of the radiator, nearest the battery
how is look that pcs
can you send me the pictures from that
i have problem with high temp on my alfa 156 1.9jtd
when i drive with airconditioned on my temp is go too high and when i drive fast more from 100km/h
i put in my wather box some cleaning liquid from crc and i change the antifreez in radiator and now is temp bether i thinks so but i must the chek when i drive on mount or on autoroad.
and radiotor is look like too old and the cooling bars is look like plastic and i loosing that when i touch with hand is destroid.
pls help!!!!!!!!!!!!!!!!!!!

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David C
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Posted: 02 September 2011 at 21:31 | IP Logged Quote David C

sashsanev, sounds like you need a new radiator....!


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