Is my cooling fan kaput - Page 2

Robti · 6th August 2015, 09:04

Quote:

Originally Posted by SD1too

How do you know that you're hearing high speed then?

Simon

True I don't know, I only assumed as it is louder than my 800 fan kicking in and you can hear it in the cabin with the windows up lol, so I have already ordered a gold one from jules, so looks like I have a spare if there is no way I can ascertain if my resistor is working or not as at idle and demist the speed sounds the same as at 100*c when the fan kicks in.

Can a T4 report if it's faulty ?

Thanks

RayH · 6th August 2015, 09:42

Quote:

Originally Posted by Robti

True I don't know, I only assumed as it is louder than my 800 fan kicking in and you can hear it in the cabin with the windows up lol, so I have already ordered a gold one from jules, so looks like I have a spare if there is no way I can ascertain if my resistor is working or not as at idle and demist the speed sounds the same as at 100*c when the fan kicks in.

Can a T4 report if it's faulty ?

Thanks

Have you tried the trinary switch test, it's in one of Jules' links somewhere, to see if the fan speed is different?

If you were stood outside the car you may be aware of low speed operation but high speed would generally startle a pedestrian nearby!

Robti · 6th August 2015, 10:25

Thanks have found the thread and will try the test later

SD1too · 6th August 2015, 10:31

Quote:

Originally Posted by Robti

I only assumed as it is louder than my 800 fan kicking in ..

It's unwise to make assumptions based on the behaviour of a different vehicle.

Quote:

... if there is no way I can ascertain if my resistor is working or not ...

You have already ascertained that your resistor is working! The demist test triggers slow fan speed and so does a coolant temperature of 100°.

If you want to trigger the high speed, remove the trinary switch connector and join together pins 2 and 3. The wiring colours are black (pin 2) and yellow with a grey tracer (pin 3), but beware! There is another wire coloured grey with a yellow tracer so make sure that you get the right one

Quote:

Can a T4 report if it's faulty ?

Yes.

Simon

RayH · 6th August 2015, 15:36

Quote:

Originally Posted by SD1too

You have already ascertained that your resistor is working! The demist test triggers slow fan speed and so does a coolant temperature of 100°.

Simon

Well we've established the fan is operating at a speed, although there may be some doubt as to whether that is slow or not

Salad-Dodger · 6th August 2015, 17:13

As far as I can see, there's no way the fast speed could be triggered by the de-mist test or the 100 degree working temperature. If you do the trinarry test, all will be revealed, but I'm not sure why you would need to do it.
Are you having any overheating problems? Steve

Arctic · 8th August 2015, 08:21

Quote:

Originally Posted by Robti

Hi looking for some help I have the silver resistor fitted at the two o'clock position and when the car is started no rotation switch on demist,and it kicks in to full power, any help if it's faulty and if I need a gold resistor ?

Thanks

Quote:

Originally Posted by Robti

Thanks sitting still it kicks in on the 100 mark, will order a gold resistor kit

From the above statements your fan seems to be working as it should, you could change the silver resistor which will bring it up to date as such, if the car is reaching 100 then the fan kicks in and the temp is brought down to 95 all is well

Astraeus · 8th August 2015, 10:05

Yip, it sounds ok mate

Chris

Robti · 8th August 2015, 11:28

Thanks all looks like I now have a gold resistor for the parts bin, fan kicks in at 100 and then off at 95 I think, the only reason I thought it was broken was that it's fast and loud at 100 and I thought that was the high speed and the low speed would be quitter and slower.

What got me started questioning this was that whenever I put the aircon on the fan would kick in and as a new owner you question every little thing lol

6th August 2015, 10:25	#13
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,982 Thanks: 616 Thanked 228 Times in 210 Posts	Thanks have found the thread and will try the test later __________________ Robert

8th August 2015, 10:05	#18
Astraeus Regional Secretary North Scotland MG ZS Exclusive 1.0T Auto 2022 Join Date: Feb 2008 Location: Tayport Posts: 5,754 Thanks: 1,676 Thanked 1,855 Times in 1,058 Posts	Yip Yip, it sounds ok mate Chris

8th August 2015, 11:28	#19
Robti Posted a thing or two MG ZT-T 190+,Rover 800 vitesse coupe Join Date: Aug 2014 Location: Hamilton Posts: 1,982 Thanks: 616 Thanked 228 Times in 210 Posts	Thanks all looks like I now have a gold resistor for the parts bin, fan kicks in at 100 and then off at 95 I think, the only reason I thought it was broken was that it's fast and loud at 100 and I thought that was the high speed and the low speed would be quitter and slower. What got me started questioning this was that whenever I put the aircon on the fan would kick in and as a new owner you question every little thing lol __________________ Robert

6th August 2015, 17:13	#16
Salad-Dodger Gets stuck in MG ZT-T 190 Join Date: Feb 2015 Location: Chatham Posts: 592 Thanks: 34 Thanked 66 Times in 62 Posts	As far as I can see, there's no way the fast speed could be triggered by the de-mist test or the 100 degree working temperature. If you do the trinarry test, all will be revealed, but I'm not sure why you would need to do it. Are you having any overheating problems? Steve