Intermittent fan cdt

Oldmanlogan · 24th February 2020, 13:42

Hi all,got a odd problem potentially ,I have begun to notice my fan turning off and on whilst stationary just turns on for about 5 seconds roughly every 20/25 seconds whilst stationary or slow moving traffic any ideas??

Mickyboy · 24th February 2020, 14:12

Is the air on on? Ie it’s not on ECON, and sound like a woossh woossh sound?
Mick

T-Cut · 24th February 2020, 19:14

The diagnostic test for a failed low speed fan system will confirn my thoughts. Run the 'Demist Test' and report back. It's likely that the low speed has failed and the aircon system is causing this effect due to the cycling over-pressurisation of the refrigerant.

You need to confirm whether your 2001 model has the earlier 3-speed fan or a later 2-speed replacement. This will affect the fix proceedure.

TC

Mickyboy · 24th February 2020, 19:55

Quote:

Originally Posted by T-Cut

The diagnostic test for a failed low speed fan system will confirn my thoughts. Run the 'Demist Test' and report back. It's likely that the low speed has failed and the aircon system is causing this effect due to the cycling over-pressurisation of the refrigerant.

You need to confirm whether your 2001 model has the earlier 3-speed fan or a later 2-speed replacement. This will affect the fix proceedure.

TC

That’s why I was asking Richard if he had a woossh woossh noise due to the fan kicking on the high speed, I think from working on Richard’s car before he’s likely to have the older 3 speed four wire fan.
Mick

Oldmanlogan · 25th February 2020, 04:19

Mick Aircon is off ,fan comes on no whoosh whoosh noise I think but I am a bit deaf ,I will look at fan to see what type I e got and go from there I suppose

Oldmanlogan · 25th February 2020, 04:20

Cheers Mick👍😄😁

T-Cut · 25th February 2020, 09:41

Apart from the fan issues common to all models, the diesel has a unique control system which depends on a printed circuit board located in the box behind the fan frame. The PCB is a well known vulnerability and can cause abnormal fan behaviour. If this becomes the prime suspect, the fault is fixable by FrenchMike.

TC

Oldmanlogan · 25th February 2020, 11:59

That might explain things I wonder if Mick has any spares????

Mickyboy · 25th February 2020, 14:08

Quote:

Originally Posted by Oldmanlogan

That might explain things I wonder if Mick has any spares????

Might even have a better 2 speed fan in the stores
Mick

Arctic · 25th February 2020, 20:21

Quote:

Originally Posted by Mickyboy

Might even have a better 2 speed fan in the stores
Mick

That's the one to go for, do not miss out on a good bargain

24th February 2020, 13:42	#1
Oldmanlogan Avid contributor Rover 75 tourer Join Date: Jul 2017 Location: kent Posts: 140 Thanks: 4 Thanked 16 Times in 13 Posts	Intermittent fan cdt Hi all,got a odd problem potentially ,I have begun to notice my fan turning off and on whilst stationary just turns on for about 5 seconds roughly every 20/25 seconds whilst stationary or slow moving traffic any ideas??

24th February 2020, 14:12	#2
Mickyboy SERVICING AND DEALER DIAGNOSTICS MG ZT CDTI 135 + & MGZT CDTI AUTO 160 & ROVER 75 TOURER CDTI 160 TROPHY YELLOW Join Date: Aug 2013 Location: Hernebay Posts: 4,331 Thanks: 818 Thanked 2,414 Times in 1,141 Posts	Is the air on on? Ie it’s not on ECON, and sound like a woossh woossh sound? Mick __________________ [SIGPIC][/SIGPIC] T4 Owner Jobs done : new UBP, Spy hole mod, Rear hub(wheel bearing),plenum cleaned and emptied, Inline thermostat fitted,Full service, In car Digital tv/DVD Bluetooth Satnav etc, Replaced UBP, Restored headlights,Fixed airbag connection.replaced HP pump,replaced rear light seals,changed intercooler O rings. Jobs to do: ,replace drivers lock,.[/SIZE]

25th February 2020, 04:19	#5
Oldmanlogan Avid contributor Rover 75 tourer Join Date: Jul 2017 Location: kent Posts: 140 Thanks: 4 Thanked 16 Times in 13 Posts	Fan Mick Aircon is off ,fan comes on no whoosh whoosh noise I think but I am a bit deaf ,I will look at fan to see what type I e got and go from there I suppose

25th February 2020, 04:20	#6
Oldmanlogan Avid contributor Rover 75 tourer Join Date: Jul 2017 Location: kent Posts: 140 Thanks: 4 Thanked 16 Times in 13 Posts	Fan Cheers Mick👍😄😁

24th February 2020, 19:14	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The diagnostic test for a failed low speed fan system will confirn my thoughts. Run the 'Demist Test' and report back. It's likely that the low speed has failed and the aircon system is causing this effect due to the cycling over-pressurisation of the refrigerant. You need to confirm whether your 2001 model has the earlier 3-speed fan or a later 2-speed replacement. This will affect the fix proceedure. TC

25th February 2020, 09:41	#7
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Apart from the fan issues common to all models, the diesel has a unique control system which depends on a printed circuit board located in the box behind the fan frame. The PCB is a well known vulnerability and can cause abnormal fan behaviour. If this becomes the prime suspect, the fault is fixable by FrenchMike. TC

25th February 2020, 11:59	#8
Oldmanlogan Avid contributor Rover 75 tourer Join Date: Jul 2017 Location: kent Posts: 140 Thanks: 4 Thanked 16 Times in 13 Posts	That might explain things I wonder if Mick has any spares????