Rover 200 / 400 Rover 200/400 - My heater Fan doesn't work on speeds 1,2 & 3 - "How Do I?" - Page 5 - MG-Rover.org Forums
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post #81 of 768 (permalink) Old 27-02-2006, 19:16 Thread Starter
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Quote:
Originally Posted by nobby66
can you send me a set plz technozen, it seems a common problem
and thanks for your posts
I didn't know Paul was a charity!?
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post #82 of 768 (permalink) Old 27-02-2006, 19:42
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Quote:
Originally Posted by Dr Dave
I didn't know Paul was a charity!?

I'm not...

Richard (nobby66) is one of my PAYING customers...!!!
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post #83 of 768 (permalink) Old 27-02-2006, 21:37 Thread Starter
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Ah....do I see a Technozen's ebay shop coming up soon?
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post #84 of 768 (permalink) Old 27-02-2006, 21:41
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Up and running since 2002!!!!
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post #85 of 768 (permalink) Old 01-03-2006, 14:22
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A slight update...

With the introduction of the ROHS directive I have found it difficult to obtain some of the resistors that I originally used.

The 3 original MG-R values are as follows...

1.5 ohm 10 watt
0.68 ohm 10 watt
0.27 ohm 10 watt

A single 1.5 ohm 10 watt resistor is relatively easy to get hold of, I have had to use a combination of resistors to achieve the other two values. If you have a similar difficulty you can use the following combinations....

Two 1.2 ohm 7 watt resistors connected in parallel to give 0.6 ohm, close enough to the 0.68 ohm required.

Two 0.47 ohm 7 watt resistors connected in parallel to give 0.235 ohm, close enough to the 0.27 ohm required.
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post #86 of 768 (permalink) Old 01-03-2006, 17:00
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Thumbs up thanks technozen

thanks technozen,

goods delivered quickly and installed works fine now, i can keep warm and listen to the radio

sounds like an ebay feedback
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post #87 of 768 (permalink) Old 01-03-2006, 21:27
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10/10 A++++++++++
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post #88 of 768 (permalink) Old 03-03-2006, 15:59
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Thumbs up

Another SHOUT out to Technozen for sorting me out with some resistors too,and an impressive delivery in no time at all,one and two speed up and running again...

Thanks Mate
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post #89 of 768 (permalink) Old 03-03-2006, 21:06
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LOL I Google for this as my R25 heater position I gave up the ghost back in November, and here I am! Tell me, technozen, how can I get some of these resistors from you?

Simon
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post #90 of 768 (permalink) Old 03-03-2006, 23:35
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Well here is a shout out to paul, nice one mate and pronto delivery


For some strange reason I was bored and just finished a crytal set for my nephew so with the Iron still hot I ventured out into the cold with technozens resistors (well I did it in the house to be precise)

As I have a wedge I measured the actual rover values v's pauls and to be honest as it's not a critical piece of electronics it makes a negligble differance.FYI rover values-1.5 0.8 0.2.No need to worry about the extra height of the ceramic ones as the void in the heater is plenty to accept them.

Old ones



Hot off the Iron



Jobs a good 'un


No more worries
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post #91 of 768 (permalink) Old 11-03-2006, 09:22
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Hi,

Yet another thanks out to Paul for sending the resistors. After it initially failed on my car I feared it would be either a big bill at the garage or several hours ripping the heater box out of the car to fix it. With's Paul's resistors and guide I did it this morning in 35 minutes from start to finish!

Definitely better than getting the garage to sort it.

Simon
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post #92 of 768 (permalink) Old 13-03-2006, 16:43
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Hi all,

I just noticed that my Rover 416 1995 heater fan stopped working on settings 1 and 2 the other day. I figured out the problem easily myself via the Haynes manual, and found this site after a Google search looking for the part.

I'm going to fix mine using Maplin resistors (maplin.co.uk). I reckon the best bet with the values they currently sell is to use 0.22 Ohms, 0.56 Ohms, and 1.65 Ohms (which is achieved by using two 3.3's is parallel). Part numbers H0.22, H0.56, H3R3 (2 off). Total cost is 1 pound plus 2.50 postage (for orders less than 35 pounds). I only actually need the 0.56 one as my other two resistors are intact, but I figure I may as well replace them all while I've got it apart.

With those values speed 4 will be correct (no resistors are used for speed 4), speeds 3 and 2 should come out about 10% too fast, and speed 1 should be pretty well spot on.

I did think about doing it "properly" as Maplin also sell Constantan wire at 5 a reel (4 ohms per metre of wire), but I'm unsure how the power handling varies with the thickness of the wire (the Maplin wire is 28 swg gauge), so I decided against that.

Last edited by stevegutteridge; 13-03-2006 at 16:57.
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post #93 of 768 (permalink) Old 13-03-2006, 22:38
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Hi to all, I have this problem also with my recent aquisition of an MGF VVC. I, too, had arrived at the resistor packs being the culprit and now this thread has provided me with the answers. Great stuff guys.
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post #94 of 768 (permalink) Old 22-03-2006, 23:42
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I think I see the problem...

Thanks to this thread I had a look at my remaining resistor, the 0.25R (position III), and did a few measurements and I can see why these resistors don't last forever - they have quite tough time.

The blower must be a pretty powerful motor - about 250W (1/3 HP) at full power, so slowing it down means rather a lot of watts need to be lost, more than 60W on position III - most of it in the 0.68 ohm. By my reckoning the resistor which dissipates the most depends on the fan setting;

Position I 1.5 Ohm 28W
Position II 0.68 Ohm 46W
Position III 0.27 Ohm 47W

I could see the impact on the 0.25R because with the resistor pack out of the ducting the coil glows orange-red almost immediately, which is less of a surprise when you think of the coils as electric fire elements. I know it gets some airflow inside the ducting but I bet it doesn't make that much difference.

I suppose the 1.5 Ohm and 0.68 Ohm fail first because they have the thinnest wire and the heat makes them brittle, then the vibration simply breaks them.

The resistor pack is pretty wasteful way of controlling the fan speed but it the method used in all cars I know of.

It would be good to come up with something more elegant, but it is probably not worth the hassle.
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post #95 of 768 (permalink) Old 25-03-2006, 11:15
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I have now fixed mine, though I only replaced the 2nd resistor in the end. The leads on the resistors are too short unless you extend them, and I couldn't be bothered given that numbers 1 and 3 were still working.
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post #96 of 768 (permalink) Old 25-03-2006, 18:57
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Tried Technozen's modification to fix this - worked a treat! Great, thanks a lot!!!

As Steve (above) mentioned, the leads on the resistors were short, but I extended all of them on my 416i.
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post #97 of 768 (permalink) Old 29-03-2006, 11:32
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Just someone else saying thanks, got the new resistor before I found your site so I've slotted it in, now I can do the resistor change in slow time. Again many thanks.
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post #98 of 768 (permalink) Old 08-04-2006, 12:01
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it it better/easier to go for the rover set or the "mod" that alot of you have done?
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post #99 of 768 (permalink) Old 08-04-2006, 22:18
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Quote:
Originally Posted by technozen
I had to sort this problem on a mates 200 today, rather than buying a new resistor pack I decided to replace the resistors. I had already done this on my own car a while ago.....this time I took some piccies and have done a tutorial.

It can be downloaded here.




Oh.....Major....don't send the legal team....I "used" some of your pics from above......................I'm not worthy etc....etc..!
fantastic can get mine done now, been running on 3and 4 for ages now,great that you took the time to do this thanks.
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post #100 of 768 (permalink) Old 09-04-2006, 10:30
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Unhappy Have replaced resistors but still nothing - help!

I tried the mod yesterday but a few things told me it was probably not the resistors.

First I lost all 4 settings at once, not gradually. Then, when I removed the resistors they all looked to be intact. I replaced them anyway just in case but the fan still does not work.

Could anyone suggest what the problem could be, and as an added bonus - how I can fix it!
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