Fuego heater/ventilation control panel removal

Thanks Sunroof, that would be great.
Lots of different numbers on various plates but I think the one you want is F0002252 which is also the last part of the VIN no stamped on the turret top
 
Ah, the Fuego. I still miss it for the endless challenges that kept me occupied.If there's any work to be done on plastic bits, let me know. ABS is my goto for custom manufacturing.
 
No just for interest it is on the oval plate and will be U000XXXX. The numbering restarted in January 1985 and is the build date not the later Australian date. Earlier numbers for R1363 started at 00000001 and ended some where in the 400000's. There was no U in front. I didn't have any thing written in my note book but will look it up in the R20 supplement. I had a quick look at the grandsons car and the wire does seem to change colour with no obvious block. I'll do a bit more research.
 
Thanks Sunroof & The Gonz,

Hopefully have attached some photos.
First one is oval plate showing the numbers.

Second onwards are attempts to show the wiring, circled in green are the 2 parts of the black plug I was talking about. Can’t find anny power on anny wire either side of the black plug.
Also the connector from those wires which connects into the ventilation/heater control unit. Obviously no power there either.
Finally there’s a single pale brown looking wire with a push on connecter at its end. This wire is live with ignition on but I can’t find anything that it connects to. I thought it might be a seperate power wire for the control unit but can’t see anywhere on that to plug it in

Hope that all makes sense!!

Blast, only 2 photos, others are too large. They show the wiring ok though.
Number on oval plate is U001760

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Just had a thought. Does the operation of the vacuum controls make electrical connections or changes to the fan operation? Reason I ask is because I took the brake master cylinder & booster out for reconditioning and as the vacuum controls get their vacuum from the manifold to booster vacuum line, there would be no vacuum at the ventilation/heater control unit.

Might be a ridiculous suggestion but you never know on these cars.
 
Yes you are right. But I will still put up the circuit description perhaps some one will look this up in the future. It is also almost identical to early models.

Ignition key operates relay C on the Printed Circuit Board that puts positive on to Fuse 8. From fuse 8 it goes through plug/socket 49 pins 10 and 11. The black and blue wires join a grey wire some where in the form where it becomes a heavy grey wire at joint 286 that is not accessible. From there it travels to a 4 pin white L shaped plug and socket that I don't have the number for. The grey wire then goes to tag 2 on the vacuum switch unit. I have not described what occurs in here suffice to know some need to be operated to power the fan. From here the power goes to the speed control switch on a yellow wire. A red wire goes to the fan unit from here.

Looking at the rear of the fuse board (PCB) Relay C is 3rd from the left. Plug 49 is the right one of the two plugs. Pins 10/11 are on the left end of Plug 49.

Hope this helps some one.
 
Incidentally the T piece that takes the vacuum off the brake booster hose is easily broken. An 8 mm nylon T piece from Bunnings irrigation fittings section will fit the pipe to the brake unit and a piece of 8mm tube will push over the pipe to the vacuum reservoir unit and the T piece for the brake hose end. Some Bunnings sell the T's separately and some 5 in a bag. The 8mm tube piece is sold separately.
 
Wow Sunroof, I didn’t expect that answer. Will plug the booster vacuum tube tomorrow, start the engine & see what happens!

I feel I’ve wasted your time & that of others a bit, but really never thought of a connection between removing my brake booster & losing ventilation control. It was only by chance I was looking under the bonnet today, saw the control unit’s vacuum hose coming off the booster hose & suddenly the possible connection clicked into place. At least it’s resulted in a good thread with some great info in it. Your descriptions of how it all works are great & I’ll be keeping them in my own filing system as well.

Having heard many horrible stories about the control unit I’m glad to have pulled one out of the car & learnt so much about it. I’ll report results tomorrow & that will hopefully finish this thread on a nice positive note.

Cheers
Alby
 
From my memory of owning a few Fuego's over 20 years ago, the flaps are vacuum controlled by pushing the buttons. There is also a small vacuum canister under the bonnet that stores a small amount of vacuum to operate the flaps. If you listen carefully you can hear the vacuum operating the flaps as you push the buttons.
 
Well, a disappointing day. Blocked the vacuum lead to the booster, made sure the electrical connection to the control unit was on nice & tight, started the car & gave it a few minutes, then tried the fan & push button controls.

No change, nothing working. Clearly no power getting to the relevant connections but good power at fuse 8, both sides. Also no hissing noise or anything else from pushing the control buttons so maybe still no vacuum either.

On a brighter note, Super Stop rang to say my reconditioned brake booster & master cylinder were ready to pick- up. Picked them up, got the booster back in. Will focus on finishing brakes tomorrow & forget about ventilation & heating for a few days. Coming back to it fresh might be just what it needs.

Cheers all
 
I was going to suggest that you remove the top and bits in the vacuum switch and clean and grease with a swipe of vasaline while you had it out, mine worked after I did that. Grandson hasn't looked at his yet. Be careful and keep all the bits in order when you take it apart there are some that can be put back incorrectly. Clean the electrical contacts in there. Check power gets that far first.
 
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Thanks Sunroof. Will do.
I have a spares car some distance away but I think I’ll go for a drive on Monday & get the control unit out of that car. It might be better but at least it will give me one to practice on.
 
Sunroof said:
I was going to suggest that you remove the top and bits in the vacuum switch and clean and grease with a swipe of vasaline while you had it out, mine worked after I did that. Grandson hasn't looked at his yet. Be careful and keep all the bits in order when you take it apart there are some that can be put back incorrectly. Clean the electrical contacts in there. Check power gets that far first.
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Also make sure that the little vacuum lines go back in the correct place so the buttons are operating the correct flap. One of my Fuegos had been dismantle by a previous owner and the ventilation system did weird things and made weird noises because those vacuum lines were incorrectly connected.
 
I seem to rember a little colour coded bit of cardboard that fitted on the heater control matrix with, and corespondent colours on the vacuum lines. Hopefully yours is still in tact.
 
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