Heater control mech

What does the single levered mech actually do?

On mine I have a melted electrical terminal and a botched spring contact.
I cant work out why there is a notch for the spring halfway through the lever's travel nor why there is a ball notchy thing making the lever click into three positions ...why?

And lastly, what does the bowden cable on that control link up to?

Non-britpart units are over £60 and 2nd hand units are lacking around these parts.... Would like to repair this one but fear that someone can suggest design improvements it may be another short term fix.

From closed (fully up) the lever gradually opens the air vents when moved towards the first detent (uses ram air effect), first click is fan low speed, second click is fan high speed. if the switch has melted make sure the fan is ok before fitting another switch.

Thanks.

Hopefully the fan isn't knackered... Will look at that.
I guess the switch is designed as it is to deal with high currents? May have to look at rebuilding it.

Still don't know why that notch is there.

Your fan has a +ive feed to both high and low speed windings and is switched through to earth on the lever assembly body.

The notch is to indicate that the heater flaps are open to the cabin from the heater matrix.

Once you go past the notch, you are switching the power on to one of the fan coils.

Never seen it with a notch or sprung lever before. How old is the vehicle?

Thanks for the description seadog.

the_wolf said:

Never seen it with a notch or sprung lever before. How old is the vehicle?

Click to expand...

Notch seems to be the norm - can see it on most STC4848 online.... the landy is an 85 ninety.

You're welcome.

Just remember that it needs a good earth for it to work.