I think you are referring to the Servo, (number 3 in illustration below), a component of the Delanair system which opens and closes vents and flaps depending on what the set temperature calls for.

looks like a miniature crankshaft, contains micro-switches and wiring as well as vacuum hoses.

 

The mode control switch has 4 micro-switches, yes. The mode switch is not easy to replace....requires partial disassembly/removal of the console as I recall. Whoever it was that recently replaced one will surely come along and have more details.

As Jose mentioned the servo has micro-switches as well. Voltage to 'trigger' the fan speed relays comes from the servo.

Cheers
DD

 

Indeed you're correct Jose, that's what I mean. Is it possible to fix?

Thanks for that Doug, I'm convinced that this is the problem.

 

Hi again all

Before I go digging to remove the mode switch, can someone please tell me whether these micro-switches are fixable, or are they sealed and need replacing?

Many thanks

 

you will have to remove the switch anyways, so remove it, reconnect the wiring and exercise the switches, 50% chance that's all it needs. Maybe spray some Contact Cleaner.

I do not know if they are fixable, I've never had to remove the mode switch, but I know that lack of use puts them in a "dormant" state. If one of them refuses to wake up, surely you can find a replacement online from electronic suppliers, eBay, etc.

 

Many thanks Jose, I'll set aside a day or so and have a go at it.

Nathan

 

Finally got around to it... Having sorted the ignition timing too, but... I cant get past the radio... This might be a silly question, but how do I get it out? I've removed the knobs for the the aircon controls and the radio controls plus the nuts holding the black cover that surrounds the radio. How do I go any further? I assume the next step is to remove the silver plastic trim / dial that sits behind the aircon control knobs.

Many thanks for any help.

 

From memory, yes. It's been many years since I had my hands in the early style radio panel.

I think the silver trim is held in by little friction pegs. Hopefully someone will verify that. I do remove that the silver panel is very fragile and easily bent....and once bent, always bent

Cheers
DD

 

can you post a picture of where you are at the disassembly? I'm not sure if the Daimler version is similar to the Jaguar.

 

Many thanks Jose and Doug, looks like it's the mounting nut that has to come off, special tool required, but I'll see what I can do.

I would post a pic if I could, Jose, but the family computer is slower than a cruise ship on idle, and my phone must have Lucas wiring cause it won't open this forum... Soon to be sorted though, I plan to move out before I hit 20 haha!

Thanks for the pic, Jose, looks like the Jaguar and Daimler have the same radio from this era.

Cheers

 

the two-notched nuts can be removed by using a small flat screwdriver placed in one of the notches and tapping it counter-clockwise from one notch, then moving to the other notch. Very simple.

a seller on eBay sells the correct tool too, I've just never had the need for it, although it would be nice to have one.

once you get those nuts removed, carefully pull the finisher panel, there are 2 fiber optic cables, connected to the plastic piece with the two Arrows. Push or pull the plastic piece down so you can put the finisher panel away.

then the radio mounting is revealed, there are four black plastic "rivets", one on each corner, tap the center pins INWARDS with a nail or pick tool. Chances are you will lose the pins, so you might have to reinstall the radio plate with screws.

then you can pull the radio.

 

Got it all out, haven't lost anything, yet... But there's nothing wrong with the mode switch, it's not getting any power... Where does the power to the mode switch come from? What colour is the main "power wire" to the mode switch? Any other items that supply power to the mode switch? I've got to trace the power supply backwards, it's a lose connection somewhere...

Any ideas?

Many thanks.

 

Looks like the servo is next... What should I be looking for? Which wires etc? Might as well do it while I've got the console in pieces. Hope it's not too much further.

I really appreciate any help.

 

Incoming voltage to the mode switch is on the green wire....which (on LHD cars, at least) is supplied by fuse #6 in the LH fuse box

Cheers
DD

 

Not so fast!

If you can fix the problem of no voltage to the mode switch you'll probably be good to go!


Cheers
DD

 

Many thanks Doug, I'll have a look at that and post back, while I'm at it though, what items / components are up stream of the #6 fuse? Any likely trouble-causers?

Thanks again.

 

Upstream of the fuse in the ignition relay---which feed a couple other circuits as well.

Anything else not working?

Cheers
DD

 

Everything else seems to be working, I'll check now. So the problem seems to be lurking between the fuse and the ignition load relay?

Thanks for the reply Doug.

 

There's output power from the relay, but nothing at the fuse box... Bad connection behind the box then? Any tricks? Now to put everything back...

Thanks for all the help.

 

try this check:

disconnect battery;

remove the entire vinyl panel (not just the little "door") over the fuse box in question. Remove the plastic fuse box cover.

remove the two screws holding the fuse box to the metal bracket, carefully pull the entire fuse box enough to see the rear wiring, and inspect all the connections at the rear of the fuse box.