Resistor Pack with Air Con

[davidg]

As I have no fan on speed 1 I read all the posts and ordered a resistor pack as no stranger to a soldering iron. After standing on my head for a while, and discovering I have wet carpets at the same time, I have decided it is near on impossible to get to the resistor pack when you have air con. Is there a How To for those with air?

Thanks
David

[Rob Bell]

It's a lot harder. Not done this, as neither of my cars have air con, but the aircon unit needs to come out.

That said, it probably needs to come out anyway, as you need to re-seal the air plenum for the ventilation system to stop the water leak.

[davidg]

I found the condense hose disconnected but whether that was me pulling out the carpet I don't know. Hoping to have it ready for Era day on Sunday so will be some late nights I fear.

[willyphixitt]

Hi David,

I've sent you an e-mail.

willyphixitt

[redarrow]

willyphixitt if there a solution, why not shear?

[Geoff.F]

I found the condense hose disconnected but whether that was me pulling out the carpet I don't know. Hoping to have it ready for Era day on Sunday so will be some late nights I fear.

That hose has "Lips" on the lower end to prevent water ingress, this however causes blockage therefore it may need to be removed and cleaned.
We were at EOTY 2003 in Zug Switzerland when Ann was paddling in the passengers footwell. For the Show/Concours Day we had all the mats laying on the ground drying out.

Hi David,

I've sent you an e-mail.

willyphixitt

An electronic circuit fix which does not require the access. Must get myself one day.
Geoff F.

[Rob Bell]

Hi David,

I've sent you an e-mail.

willyphixitt

An electronic circuit fix which does not require the access. Must get myself one day.
Geoff F.

Yes, and it won't burnt out either like the original does.

As willyphixitt is selling this, he's not breaking any forum rules on advertising by suggesting off-board contact

[redarrow]

willyphixitt what the price, can we all get one?

[Charless]

The price was in the region of £40 a couple of years ago and (if you have aircon) they save you a fortune in disassembling the aircon to get at and replace resistors which could easily go again. His design, which he builds to order, uses varying 12v pulse duration to control speed, not resistor wire dropping voltage level. He sells them all over the world as a hobby and they are a much more elegant design that the cheapo OEM solution. He is too modest to brag about it or plug it on a non commercial forum which has rules against such behaviour. It is all in the archives, or you can pm him.

[lsparrow]

I can highly recommend willy's electronic pack, I had one send to me in New Zealand. I have air con and it works a treat; no messing about with removing heaters and dashboards etc. Bill is a very friendly and helpful guy, detailed instructions; quick job.

[davidg]

I am considering the electronic pack but decided to have a go at changing the resistors as had already bought replacements. The job is partly done and I now have all three speeds on the fan. I am finding reassembling the aircon the hardest part and spent several hours on my head last night, and acheing rather today. I cannot get the last few clips on as the bottom half of the plastic is not a good enough fit on the bulkhead side, so can't see it either. Have taken it off several times but refuses to go back correctly.

Do I wish I hadn't bothered? Yes and no. It is an extremely difficult task but I found the fan impellar full of the grey foam/sponge that had once been round the evaporator. I have removed the rest of it to stop a recurrence. Not looking forward to recommencing battle tonight.

[redarrow]

davidg that why willyphixitt made the circuit board for,but at the same time they don't go wrong like what you just installed.

willyphixitt i got a non air conditioning car, i wanted to no, if i got a non con circuit from you, when my heater goes resistor part, then i can fit your resistor circuit design and the heater will work again. is that correct.(i no your design out weighs all others.OEM example.

i read he supply both air con and non air con.

[Rob Bell]

I imagine it's an SCR based circuit, and as such will probably last indefinitely as it's solid state, rather than a coiled length of tungsten sitting in the breeze...

[Charless]

That is true, he does both, but the cost is still in the £40 ball park. He is probably too busy making them and doing interesting things to scan the web all day, why not pm him?

[redarrow]

charles, i will when got the money and time, i will also mention your name.

just want to thank you, for the grate contact, and post's on this and other forum's.

[davidg]

The job is done Fan working, air-con back together, fan impellar cleaned out, drain tube reattached. Passenger seat still out and carpets drying, but it's getting there.

[Rob Bell]

Good work!

[willyphixitt]

Blimely guys,

It's been busy here. I've not looked at the website for a few days. Gonna take me a while to read all the posts.

David - SO IT IS POSSIBLE to change the resistor pack on aircon fitted cars - without removing the refrigerant I presume.

As has been mentioned I do make a couple of electronic gizmos to replace the failing resistor packs. The vast majority of orders are for aircon fitted cars for the reasons already discovered. The units (aircon) uses two 555 timer chips and two high power mosfets. The mosfets (transistors) are in effect very low resistant switches one of which is pulsed on and off to varying degrees to achieve the speed variations. The non aircon version is about a £5-00 cheaper, although it takes almost as long to build. Currently the aircon version is priced at £45-00 (£47-00 via Paypal for UK delivery) which includes recorded delivery to the UK. International orders are generally about £12-00 to £13-00 more. Postal charges from Jersey are going up again this month so I may have to tweak my prices. Some components have jumped up dramatically in price over the few years I've been making the units. These items never appear in any rpi or cpi indexes, do they!!

I hope the above brings everybody up to speed. The attached photo shows what's inside the box. Two heavy duty components (mosfet and a diode) are mounted on the alloy plate underneath the control box.

willyphixitt

[artful.codger]

I think I will have another go at removing the module first, or rather get one of my sons to have a go for me. Repairing the module once removed won't be a problem. If all else fails I'll be sending Willy an email.

[redarrow]

davidg ,can you provide, a step via step, example of fitting this resistor pack please.

there no real descent pictured guide any help would be so grateful, loads ask with no ans-aw.

looks like there a knack in getting to the restore pack, and then repairing it, or replacing it.

can you help, picture, full explanation be nice.