Radiator Fan Dead?
 

Hi All,

My 75 seems to have a dead fan. I tried some of the tests you guys have posted, eg demist test and running with climate control on and the front fan doesn't seem to spin up.

Also, at idle, the temperature seems to climb around 105C. Whilst I know this is within tolerance, I thought the fan should cut in around this temp.

Any suggestions on what to check next? What is the "gold resistor" I see floating around some posts?

thanks in advance. :}

Plenty of threads available on this subject in the Technical Help & How To forums :} Do a search and all will be revealed ;)

I have done, hence why I am aware of things like the gold resistor and operating temps, sometimes the search terms one enters may not always find the post or threads that answer the question.

One thread I am looking at right now talks a lot about the resistor, but doesn't shed light on what it actually does or where it is.

theres loads of threads regarding the fan and resistor, it depends on what type of fan is fitted to your car my v6 has the fan kicking in at a 100deg and cools to 94, but someone will give you all the info you require everyone in the uk is sleeping so give it a few hours

Thanks casper,

I am aware of the time of night, I think we're 12 hrs ahead. As I said, the searches I found talk about specific parts but don't really help me if I am not familiar.

eg what components do I check to nail down the problem? I think there is a fusible link, a relay and this resistor that is mentioned, but I'm not sure.

anyway hope you guys enjoy your breakfast for those who are still sleeping. :p:

ok,

looking at this post:

http://www.the75andztclub.co.uk/foru...92&postcount=6

I don't have one fitted. :shrug:

Fan spins freely.

Even a 2004 model may have the earlier 3-speed fan system. It's not possible to define it exactly. A visual examination of the motor is the only way to be sure. Also, some 2-speed models had the resistor mounted out of sight for some obscure reason, so you can never be 100% certain.

To establish which system you have means taking off the front bumper panel and checking the motor wiring. Resistor controlled (2-speed) motors have two wires entering the case. The other KV6 system (3-speed) has four.

If it is indeed a 3-speed, a replacement 2-speed will be needed or a rebrush of the old motor. If it's a 2-speed you need a replacement uprated resistor. They're easy to fit and are available from forum traders, ebay, electronics outlets, etc.

There are HowTos available for doing all the required tasks.

TC

Thanks T-Cut,

My 75 is MY03 Reg May 04

I shall have a look over the weekend. Any other ideas welcome. :}

Hi all,

Sorry for bumping this thread. I have got to the point of pulling the front end off my 75, based on this post:

http://www.the75andztclub.co.uk/foru...61&postcount=1

I gather that being the V8 in the pics, the duct is specific to the V8. If taking the whole front end off, I don't have to undo the 8 bolts on the crash bar?

I've also read about the demist test.

ATM, I'm a bit hesitant to pull the front off. What I would like to know is without pulling the front off, whether there is a test point somewhere that I can stick a multimeter to check the fan motor. If there is, where is it and what sort of reading should I expect? I have found the link about the carbon brushes from ECP, but what if it's the PCB?

I'd really appreciate someone shedding some light on this before I begin the dismantle.

Thanks again in advance. :}

As far as I remember you do have to remove the 'crash bar' (which MGR calls the armature :shrug:).
No there isn't Rod. You have to remove the front, but it's not as bad as it sounds.
The PCB system is found only on the diesels, so it won't be that!

Simon