Home Brewer Heater Resistor Pack (pics) - MG-Rover.org Forums
Reply
 
LinkBack Thread Tools Rating: Thread Rating: 5 votes, 4.20 average. Display Modes
post #1 of 37 (permalink) Old 03-02-2006, 18:08 Thread Starter
Registered User
 
Join Date: Jan 2006
Car: MGF
Posts: 27
Home Brewer Heater Resistor Pack (pics)

First little job on the wifes mgf was to get 1 and 2 working on the heater fan.

As you can see both coils are burnt out.



After a trip to Maplin, I made up some coils of resitor wire to the correct ohms, and soldered them in.

Not as pretty as a new one but works perfectly fine. All for about 5

Tony26 is offline  
Sponsored Links
Advertisement
 
post #2 of 37 (permalink) Old 03-02-2006, 18:11
Registered User
 
Join Date: Feb 2005
Car: Please Select
Posts: 291
What impedance are we talking about?
jupilerman is offline  
post #3 of 37 (permalink) Old 03-02-2006, 18:13 Thread Starter
Registered User
 
Join Date: Jan 2006
Car: MGF
Posts: 27
1= 2.1ohms 2= 1.5ohms 3= 1ohms
Tony26 is offline  
 
post #4 of 37 (permalink) Old 03-02-2006, 18:25
Registered User
 
Join Date: Dec 2005
Location: Fordingbridge (Hampshire)
Car: MGF VVC 2000MY
Posts: 1,205
Send a message via MSN to Pete T
Great tip Tony!! - I'll try and remember that one!!

Think I've still got some Eureka Wire somewhere.....
Pete T is offline  
post #5 of 37 (permalink) Old 03-02-2006, 18:26
Registered User
 
Join Date: Nov 2003
Location: South Wales
Car: MGTF160
Posts: 2,413
Did the same with my F's and Rover 400 Resistor pack (same both cars)as both had gone same as Tony's, the original coils 1 and 1.5 ohms are very very thin and delicate i replaced with a little bit stronger resisitor wire also, it's great to have poss 1 and 2 working on both cars again as poss 3 a little too much sometimes, Dave
DAVIDT6DCM is offline  
post #6 of 37 (permalink) Old 03-02-2006, 22:41
Registered User
 
Join Date: Jan 2005
Location: Bedfordshire (Barton-Le-Clay)
Car: MGF
Posts: 1,712
Question

Quote:
Originally Posted by Tony26

After a trip to Maplin, I made up some coils of resitor wire to the correct ohms, and soldered them in.

Not as pretty as a new one but works perfectly fine. All for about 5
I have exactly the same problem with my resistor pack. Any chance you could let me know the spec of the wire and the lengths required for each bit. I am ok with a soldering iron so might give it a go. Did you use special solder? Will it melt normal solder as it gets pretty hot!

Cheers

Ben
Benfinlayson is offline  
post #7 of 37 (permalink) Old 04-02-2006, 08:43 Thread Starter
Registered User
 
Join Date: Jan 2006
Car: MGF
Posts: 27
This is the wire I bought from maplin, I used this for fan speed two which is 1.5 ohms, just wound the wire round a screw driver, then tested using a multimeter. For fan speed 1 the wire is slightly finer, sorry I didn't measure the length of wire used was just trial and error. You can use normal solder because the coils are cooled by the fan in the heater box.

Tony26 is offline  
post #8 of 37 (permalink) Old 24-10-2006, 10:16
Registered User
 
Join Date: Jan 2003
Location: Beccles
Car: Ford Focus
Posts: 217
Send a message via MSN to Dave400
Just for anyone wanting to find this...
http://www.maplin.co.uk/Module.aspx?...NTaN&doy=24m10

Based on the figures quoted by Maplin, 4.2ohms is 1 metre of wire therefore...

50cm = 2.1ohm
35cm = 1.5ohm
23cm = 1ohm

Also availble from http://www.wires.co.uk/acatalog/cn_bare.html

Last edited by Dave400; 24-10-2006 at 10:25.
Dave400 is offline  
post #9 of 37 (permalink) Old 24-10-2006, 10:58
Registered User
 
Join Date: Nov 2005
Location: Hampshire hog
Car: MGF Trophy 160 SE
Posts: 7,791
Send a message via MSN to KrisFX
Hows about adding this little gem of a tip to your one-stop shop website Mr V?

Think it could prove handy for quite a few people.
KrisFX is offline  
post #10 of 37 (permalink) Old 24-10-2006, 11:12
Registered User
 
Join Date: Jul 2004
Location: North Norfolk
Car: MG TF 160 in Trophy Yellow
Posts: 47,846
Quote:
Originally Posted by krisxf View Post
Hows about adding this little gem of a tip to your one-stop shop website Mr V?

Think it could prove handy for quite a few people.
its been on for a while, altho I will try and make it easier to find via the search.
Petevick is offline  
post #11 of 37 (permalink) Old 24-10-2006, 11:18
Registered User
 
Join Date: Nov 2005
Location: Hampshire hog
Car: MGF Trophy 160 SE
Posts: 7,791
Send a message via MSN to KrisFX
Quote:
Originally Posted by petevick View Post
its been on for a while, altho I will try and make it easier to find via the search.
Ooops, now I feel silly!
KrisFX is offline  
post #12 of 37 (permalink) Old 24-10-2006, 12:15
Registered User
 
Join Date: Apr 2006
Location: N.Ireland
Car: MG
Posts: 1,029
Great pics Tony26

Seemed to be common problem, had to replace one in a Landy 14 and in another Rover 24. If only I had spotted the DIY fix before hand

Another thread kicked off by Dr Dave uses individual resistors instead of wire:

Rover 200/400 - My heater Fan doesn't work on speeds 1,2 & 3 - "How Do I?"

Technozen placed a good diagram of wiring position in post 54

They are also using different ohms 1.5, 0.68 and 0.2

Q. How does your fan speed run in comparison to the original?

Also, can you use something like fire cement to keep the wires evenly spaced and prevent the coils making contact?
D.R. is offline  
post #13 of 37 (permalink) Old 24-10-2006, 12:45
Registered User
 
Join Date: May 2005
Location: Bremen, Germany
Car: MGF 1.8i, MGF & MGTF 1:18
Posts: 12,788
Send a message via Skype™ to Herbie
Great !
I feel a little project coming on (1 not working) but it's the hell to reach that pack. Any hints for a LHD car, 'cos I almost broke my fingers trying to reach the area ?
Herbie is offline  
post #14 of 37 (permalink) Old 24-10-2006, 12:58
Registered User
 
Join Date: Jul 2004
Location: North Norfolk
Car: MG TF 160 in Trophy Yellow
Posts: 47,846
Quote:
Originally Posted by Herbie View Post
....Any hints for a LHD car.....
print the pictures in reverse Herbie
Petevick is offline  
post #15 of 37 (permalink) Old 24-10-2006, 13:09
Registered User
 
Join Date: May 2005
Location: Bremen, Germany
Car: MGF 1.8i, MGF & MGTF 1:18
Posts: 12,788
Send a message via Skype™ to Herbie
Are you sure Pete ?

I don't know, the heater mechanics and so on....... help meee
Not soooo important if only 1 doesn't work, but on the other hand I always want it perfect.....
Herbie is offline  
post #16 of 37 (permalink) Old 24-10-2006, 14:54
Registered User
 
Join Date: Mar 2002
Location: London
Car: MGF and MG ZT-T (also Mk3 Triumph Spitfire and Mk1 Austin Mini)
Posts: 3,805
Quote:
Originally Posted by D.R. View Post
Great pics Tony26

Seemed to be common problem, had to replace one in a Landy 14 and in another Rover 24. If only I had spotted the DIY fix before hand

Another thread kicked off by Dr Dave uses individual resistors instead of wire:

Rover 200/400 - My heater Fan doesn't work on speeds 1,2 & 3 - "How Do I?"

Technozen placed a good diagram of wiring position in post 54

They are also using different ohms 1.5, 0.68 and 0.2

Q. How does your fan speed run in comparison to the original?

Also, can you use something like fire cement to keep the wires evenly spaced and prevent the coils making contact?
Thanks for that link. Did anyone see this posting?

Quote:
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.
No one has adequately answered this particular conundrum - namely the resistors being used are only 1/5th of the rating required to dissipate the energy required!

Carl had another solution using MOSFETS - might have to find out a little more about this...
Rob Bell is offline  
post #17 of 37 (permalink) Old 24-10-2006, 15:10
Administrator
 
Chris T's Avatar
 
Join Date: Feb 2005
Location: Leicestershire
Car: MG TF 135 Platinum Silver, Skoda Roomster
Posts: 32,596
Garages
I think if I ever need to renew the resistor pack I would be tempted to get hold of some proper power resistors that can be bolted down somewhere.
Chris T is offline  
post #18 of 37 (permalink) Old 24-10-2006, 15:13
Registered User
 
Join Date: Apr 2005
Car: Rover 75 1.8T
Posts: 27,729
there's a thread in 'How Do I' which covers this, if you dare venture out
mercodus is offline  
post #19 of 37 (permalink) Old 24-03-2009, 17:59
Registered User
 
Join Date: Mar 2009
Location: scunny
Car: MG ZR
Posts: 4
heater

mmm interesting thread this,ive the same problem, tho ive no fan working and no cig lighter or interior light of clock light working, are all these linked,or is the resistor pack the likely culprit for my heater and the other problems something else?
partyboy is offline  
post #20 of 37 (permalink) Old 24-03-2009, 18:07
Never forgotten
 
Join Date: Apr 2007
Location: Fife Scotland
Car: Astra CDX auto, Freelander TD4 & Freelander 1.8, Mini One
Posts: 8,634
Send a message via MSN to MGFmad
No they are not linked, I wonder if you have a wiring problem at the back of the centre console.

Resistor pack may still be faulty as a stand alone fault - you can access it from the passenger footwell - just a couple of screws and its out so you can check if the resistors are burnt out. If you need new resistors PM Technozen he will supply new correctly rated ones at a great price.

On the other faults, check the wiring at the back of the console - it may have been rubbing on something sharp or the plug connectors could be loose - has anyone been fiddling about in there recently?
MGFmad is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MG-Rover.org Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
heater resistor pack paulineb MG ZS / Rover 45 & 400 10 06-11-2008 01:11
heater resistor pack paulineb Wanted 3 30-10-2008 21:20
resistor pack (Heater) bhogalb MG ZR / Rover 25, 200 & Streetwise 13 20-03-2007 00:25
Heater resistor pack Dave For Sale 1 15-02-2007 21:34
Heater resistor pack andrewuk Others 8 09-03-2005 15:07

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome