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Author Topic: Screen heater elements  (Read 389 times)

Offline regw

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Screen heater elements
« on: December 31, 2020, 01:57:21 pm »
I suspect I'm flogging a dead horse here but the screen defroster switch
at the console only works at the extreme right or left of the screen.
The wiring diagram in the hyenas manual shows right and left elements
each of which I assume contain multiple parallel heater elements.

It's probably some of the elements in each channel broken and only a new screen
( which aint going to happen) would improve

Not a major disaster and I can live with it unless someone has insights or cunning wheezes to
get then working again?

Offline SirDavidAlhambra

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Re: Screen heater elements
« Reply #1 on: December 31, 2020, 02:47:15 pm »
Not sure but I will try and find out by looking in the internet and so on

I think there may be separate fuses for different parts of the screen, have you checked that as a starting point my friend

This is a useful feature to have and it would be good to help you get it working
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline johnnyroper

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Re: Screen heater elements
« Reply #2 on: December 31, 2020, 04:45:19 pm »
More than likely the connection on the defective side of the screen has detached,they have been known to fail in the past. Probably a replacement screen job

Offline regw

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Re: Screen heater elements
« Reply #3 on: December 31, 2020, 08:41:18 pm »
Thanks guys but as both sides work, albeit partially,
I doubt its a connector dropped off but the elements failing.

It isnt a serious issue for me luckily and certainly doesn't warrant a new screen

We never had screen heaters when I were a lad....... :D

Offline johnnyroper

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Re: Screen heater elements
« Reply #4 on: December 31, 2020, 08:49:42 pm »
Sorry I read it wrong thought it was just one side not working. Yeah you got some dead elements in your screen by sound of it

Offline SirDavidAlhambra

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Re: Screen heater elements
« Reply #5 on: December 31, 2020, 08:58:33 pm »
Back in the day I used to boil the kettle and pour it over the windscreen, people said it would shatter but it never did (do not try it though!!! Modern cars might not be as strong). Then I would spray de-icer all over it and get the blower working on it until the car warmed up. I found keeping the window open a notch and using a chamois to keep wiping the screen worked best. But if u got ice on the outside as u were driving then that was a real problem

 cya
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline johnnyroper

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Re: Screen heater elements
« Reply #6 on: December 31, 2020, 10:56:09 pm »
Don’t need to scrape mine just fire engine up and put on screen demist and it’s cleared in no time due to an electric pre heat element. Not quite as quick as the heated screen but not much different.

Offline regw

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Re: Screen heater elements
« Reply #7 on: January 01, 2021, 12:13:18 am »
Just out of interest,
I was surprised to see its fed via a 50A fuse.
I doubt it would draw much current of course, but even at say 40A@14.2v thats 568 watts
which is a third of the alternators rated output! 120A@14.2V
No wonder its on a timer.




Offline insanitybeard

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Re: Screen heater elements
« Reply #8 on: January 01, 2021, 08:37:37 am »
And also why it won't activate if the engine isn't running! They do use a lot of juice for sure, presumably a lot more than the rear screen due to the much greater number of elements.

Johnny, how do those pre-heaters work? Is it just an electric element in the blower box which warms the air stream as it's blown through? Guess it still needs a lot of power but gets around having to embed elements in the screen (which I believe is a Ford patent which other manufacturers have to pay a licensing fee to use).
« Last Edit: January 01, 2021, 08:39:57 am by insanitybeard »
Always learning..... Often by mistakes!

Offline johnnyroper

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Re: Screen heater elements
« Reply #9 on: January 01, 2021, 12:41:06 pm »
Yeah it’s just an electric ptc heater unit within the heater box,think it is only activated below a certain temp or if full screen demist is selected. Also inactive below a certain coolant temp switches off once coolant temp high enough to take over. Size of cables suggests it draws some current though.

Fired car up this morning to shift the ice whole car was done in a few minutes so it probably is a better system to having screen heater only even if it’s marginally slower clearing the screen.

Offline SirDavidAlhambra

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Re: Screen heater elements
« Reply #10 on: January 01, 2021, 01:28:29 pm »
So impressive, you guys put all the best little modifications in your cars, you really do
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline johnnyroper

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Re: Screen heater elements
« Reply #11 on: January 01, 2021, 05:40:19 pm »
So impressive, you guys put all the best little modifications in your cars, you really do

It’s not a modification it is factory fit equipment on BMW’s with Diesel engines

Offline SirDavidAlhambra

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Re: Screen heater elements
« Reply #12 on: January 01, 2021, 06:43:21 pm »
Ah, understood. Fairly impressive feature nonetheless!

Rumour has it you can get these things that plug into the mains and get your coolant nice and hot before you set off, they use them in Canada so that the engines start ok in the cold weather (oil can be too viscous otherwise)
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

 

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