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1st May 2017, 08:41 | #1 |
Posted a thing or two
Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016
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Gold Resistor exploded?
I fitted a new gold resistor to the fan about 6 weeks ago, and everything was fine until yesterday.
I fitted my recently aquired front bumper yesterday morning. The bumper came with all the lights and temp sensor fitted, so I figured that before I replaced all the bolts and fittings I would check all the lights were working. I started the engine and checked the indicators were flashing, yes! small spot lights, yes! headlights, yes! All good to go! (I had the bonnet open) Out of the blue I saw smoke coming up from from the left side radiator area, very quickly followed by a pop noise. I quickly turned off the engine and was ready to get a bucket of water expecting flames! The smoke had that electrical smell, and slowly cleared. I figured I knew what it was, so got my torch and shone it into the front grill at the resistor. Yes, it was the resistor, one of the ends looks to have blown out of the gold case. I am at a loss as to what caused it. I am guessing the fan didn't start. Now I know that the resistor MUST have the fan blowing on it because it gets hot very very quickly as i found out when I was fitting it just a few weeks ago. The only thing that I can think of is that when the temp sensor has been disconnected the system has to re-set. I do remember when starting the engine that the gauge in the car was showing -9 deg, but I didn't think anything about it as it had done the same last time the bumper was off. Did the -9 deg cause the fan not to start? I can't remember if when I fitted the resistor if I turned on the air-con demist which turned on the fan straight away. I have ordered a new gold resistor, but I just wondered if anyone else has had a similar experience. |
1st May 2017, 09:15 | #2 |
Posted a thing or two
mg zt Join Date: Mar 2014
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Faulty resistor, or, the fan was jammed or has failed. No need to look any further. The resistor regulates the current (well limits it is a more accurate description), to the fan. If the fan runs it will cool the resistor. If the fan motor is short circuit or stuck it will draw more current, overloading the resistor.
Check the fan, if its ok just fit another (better quallity?) resistor. |
1st May 2017, 09:34 | #3 |
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75 CDT Auto Tourer , Rover 45 , Astra, Zaffira, Chev Captiva Join Date: Mar 2011
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My third one went last week, also popped. Had one go 3 years ago that popped , set light to the wd40 I had sprayed onto the bonnet catch and got sucked into the air filter. That also set light and melted the air intake😳. First one was a eBay unit, second replacement not. Fan was working.
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1st May 2017, 09:54 | #4 | |
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Rover75 and Mreg Corsa. Join Date: Nov 2006
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Quote:
I wonder why the 80amp fusible link in the under bonnect fuse box didn't blow first? Isn't it supposed to prevent this? I've suggested before that this fuse is too big. To support the argument, I've replaced mine with a smaller fuse. My fan is now running perfectly well with a 40amp link despite 'calculations' suggesting the startup current needs the 80amp fuse. I'd suggest the fan wiring will ignite before an 80amp fuse gives in. To me, the size of the wiring looks more like 35-40amp. TC |
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1st May 2017, 09:56 | #5 |
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Rover 75 Saloon CDTi Join Date: Oct 2015
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Are the GOLD RESISTORS that are failing been supplied via traders on the Forum or were they "ebay" specials ?
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1st May 2017, 10:02 | #6 |
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Rover 75 Saloon & Tourer Join Date: Sep 2012
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I too had one fail last year. Had been on the car for about 2 - 3 years. one end had blown out. mine came from a trader here as did the replacement. could water have gotten into the resistor?
macafee2 |
1st May 2017, 10:04 | #7 | |
This is my second home
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Quote:
Resistor Smoke Signals: http://www.the75andztclub.co.uk/foru...d.php?t=181368 TC Last edited by T-Cut; 1st May 2017 at 10:45.. |
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1st May 2017, 10:15 | #8 |
This is my second home
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1st May 2017, 10:39 | #9 | |
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Quote:
I would say yes myself if the join to the resistor as not been heat shrank tight, it is always best to make sure the heat shrink is pushed fully home up against the wall of the resistor.
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1st May 2017, 10:54 | #10 | |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
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Quote:
I'm more concerned about the lack of fuse protection. It's obvious that the 80amp fusible link in the motor supply circuit isn't doing what it should. TC |
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