A bang and a burning smell... but no indication of a problem (yet)

HarrySeven · 11th December 2017, 10:06

This morning, I fired up my 2002 75 2.0 in preparation for going out later, while I cleared snow off my other cars.

About 10 mins running, there was a loud bang from under the bonnet and a burning smell.

No change in engine running, no warning lights, nothing (and no signs where it came from, either).

I’m guessing that something didn’t like the cold, but...stupid question...where on earth do I start re. identifying what went pop?

Very puzzled!

macafee2 · 11th December 2017, 10:14

check the fan at the front, has the resistor exploded?
Look through the bumper. Gold resistors are known to do this some times.
If the resistor is not Gold then perhaps Grey

macafee2

HarrySeven · 11th December 2017, 10:49

Cheers - will do so ASAP.

HarrySeven · 4th January 2018, 18:59

It's taken a while, but this is what I've found so far...

It is a gold resistor:

Symptoms (if that is indeed what they are):

*Occasionally, the fan starts, then a few seconds later, spins down and stops. NB. This isn't when the car is overly hot.

*Several times, I have heard what I can only describe as a "chattering" sound from the front of the car - is this what is meant by the fan "pulsing"?

*I followed the guide listed elsewhere on here (re. testing a pulsing fan) - mine didn't seem to follow the same pattern when I went through the steps.

stevestrat · 4th January 2018, 19:11

To put it mildly, that doesn't look right! Looks as if the end of the resistor has blown out and there doesn't seem to be any insulation on the wire

macafee2 · 4th January 2018, 19:31

as stevestrat says, that's not right.

I'm well pleased with myself for getting the correct diagnosis.
These are more fiddly than hard to change

macafee2

HarrySeven · 4th January 2018, 19:49

Cheers!

I guess I need one of these then?

Rover 75 MG ZT Radiator Fan Hi-Spec Low Speed Resistor - Full Installation Kit https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F 132457246259

stevestrat · 4th January 2018, 19:53

Jules, a trader on here, supplies them, I trust his before an unknown Ebay supplier. https://the75andztclub.co.uk/forum/s...ad.php?t=68336 By the look of the photo I think you'll need some cable as well.

planenut · 4th January 2018, 20:17

Quote:

Originally Posted by macafee2

as stevestrat says, that's not right.

I'm well pleased with myself for getting the correct diagnosis.
These are more fiddly than hard to change

macafee2

Well done, it's well hidden and most people wouldn't find that.

HarrySeven · 4th January 2018, 20:33

Excellent! Thanks All!

11th December 2017, 10:06	#1
HarrySeven Newbie Rover 75 Tourer Join Date: Oct 2017 Location: In The Middle Posts: 13 Thanks: 1 Thanked 0 Times in 0 Posts	A bang and a burning smell... but no indication of a problem (yet) This morning, I fired up my 2002 75 2.0 in preparation for going out later, while I cleared snow off my other cars. About 10 mins running, there was a loud bang from under the bonnet and a burning smell. No change in engine running, no warning lights, nothing (and no signs where it came from, either). I’m guessing that something didn’t like the cold, but...stupid question...where on earth do I start re. identifying what went pop? Very puzzled! Last edited by HarrySeven; 11th December 2017 at 10:11..

11th December 2017, 10:14	#2
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,942 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	check the fan at the front, has the resistor exploded? Look through the bumper. Gold resistors are known to do this some times. If the resistor is not Gold then perhaps Grey macafee2 Last edited by macafee2; 11th December 2017 at 10:16..

4th January 2018, 19:11	#5
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,506 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	To put it mildly, that doesn't look right! Looks as if the end of the resistor has blown out and there doesn't seem to be any insulation on the wire __________________ Steve T4 Location Map

4th January 2018, 19:53	#8
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,506 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	Jules, a trader on here, supplies them, I trust his before an unknown Ebay supplier. https://the75andztclub.co.uk/forum/s...ad.php?t=68336 By the look of the photo I think you'll need some cable as well. __________________ Steve T4 Location Map

11th December 2017, 10:49	#3
HarrySeven Newbie Rover 75 Tourer Join Date: Oct 2017 Location: In The Middle Posts: 13 Thanks: 1 Thanked 0 Times in 0 Posts	Cheers - will do so ASAP.

4th January 2018, 18:59	#4
HarrySeven Newbie Rover 75 Tourer Join Date: Oct 2017 Location: In The Middle Posts: 13 Thanks: 1 Thanked 0 Times in 0 Posts	It's taken a while, but this is what I've found so far... It is a gold resistor: Symptoms (if that is indeed what they are): Occasionally, the fan starts, then a few seconds later, spins down and stops. NB.* This isn't when the car is overly hot. Several times, I have heard what I can only describe as a "chattering" sound from the front of the car - is this what is meant by the fan "pulsing"? I followed the guide listed elsewhere on here (re. testing a pulsing fan) - mine didn't seem to follow the same pattern when I went through the steps.

4th January 2018, 19:31	#6
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,942 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	as stevestrat says, that's not right. I'm well pleased with myself for getting the correct diagnosis. These are more fiddly than hard to change macafee2

4th January 2018, 19:49	#7
HarrySeven Newbie Rover 75 Tourer Join Date: Oct 2017 Location: In The Middle Posts: 13 Thanks: 1 Thanked 0 Times in 0 Posts	Cheers! I guess I need one of these then? Rover 75 MG ZT Radiator Fan Hi-Spec Low Speed Resistor - Full Installation Kit https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F 132457246259

4th January 2018, 20:33	#10
HarrySeven Newbie Rover 75 Tourer Join Date: Oct 2017 Location: In The Middle Posts: 13 Thanks: 1 Thanked 0 Times in 0 Posts	Excellent! Thanks All!