How does the 411 Heater operates?

[Thomas591]

Hello,

I am completely puzzled how the heating system works on my 411 S5. I Someone enlighten me what‘s technically happening when I turn the demist/defrost knob? Were can I get this spongy ( really awkward feeling) rubber tubing shown in the attached picture?

Regards

Thomas Willig

[peter dowdle]

The million $ question what is demist verse defrost. Demist sends air to the screen while retaining air flow to the cockpit . While defrost sends hot air to the screen only.

There is a wonderful article floating about on the workings of the heater box which needs to be placed on this forum for future reference.

This advice is from memory as I have replaced my heater with a "VINTAGE AIR" heater and cooler system which utilizes all the original piping so I hope I have it right.

[peter dowdle]

With regards to the rubber tube, I couldnt source one , so instead I uses a white plastic down pipe elbow with a short piece of pipe sticking out one end. With a bit of imagination you can get it to fit. I then wrapped the made up bend with black woven Duct Tape to make it look a little better. It worked well

[Thomas591]

Hi Peter,

I looked all over the net to find this article , nothing. I wished the Bristol forum would have a technical knowledge base were all these questions, than have been asked many times, could be archived. Now the wheel has to be invented again and again....

Thomas

P.S. To replace the heating system with an aftermarket system is not what I want to to. I prefer to keep things original.

[Kevin H]

Originally Posted by Thomas591

Hi Peter,

I looked all over the net to find this article , nothing. I wished the Bristol forum would have a technical knowledge base were all these questions, than have been asked many times, could be archived. Now the wheel has to be invented again and again....

Thomas, are you talking about this Bristol forum?
There is a search function.

Let me know if you have some ideas how it could be better organised.

Kevin

[peter dowdle]

Kevin

Try. david-billington@blueyonder.co.uk. He wrote the article and is a realy nice guy. It was published in the UK club magazine some time ago. I feel sure he would agree to have you submit it to the Forums technical section.

Thomas regarding originality the 411s didnt have factory air. I dont like the look of the aftermarket units hung under the dash therefore like Kevin I designed and fitted an intergrated unit which cannot be seen inside the cabin or under the bonet.The air comes out the dash vents or on your feet or on the screen.

[Kevin H]

Originally Posted by peter dowdle

With regards to the rubber tube, I couldnt source one , so instead I uses a white plastic down pipe elbow with a short piece of pipe sticking out one end. With a bit of imagination you can get it to fit. I then wrapped the made up bend with black woven Duct Tape to make it look a little better. It worked well

That's exactly what I did, although I didn't cover it with duct tape. I guess it could be painted black. Although when the cover is in place you can't see it anyway.

[peterg]

'this spongy ( really awkward feeling) rubber tubing' is heavilly deteriorated rubber