Manual XJ6 Series 3 Air Conditioning/Heater Controller
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- Опубліковано 14 жов 2018
- The AC/Heater controller on these cars with the Delanair heater have always been problematic. Originally they were available but expensive, then there were aftermarket units that were less expensive but unreliable, now, who knows.
Anyway, about 10 years ago I decided to have a look at how this thing works and worked out a manual controller that would give me complete control of the system, but manually. The unit will no longer automatically keep the temp, but it can be adjusted by moving the temp control.
By the way, this also will work with the Series 2 XJ6 and the XJ-S from the beginning until sometime in the late 80s. Any of the cars that use the servo instead of the electronic type.
This video shows the latest incarnation of the controller and more or less how it is constructed.
If you have questions, or want a copy of the parts list or schematic, just get in touch.
This video shows a later version, and one that I can easily make up to sell if anyone wants one. • Jaguar XJ Heater/AC ma... - Авто та транспорт
GM, great vid, made me think about the Electronic Eng course I took!
thanks for the video ,my aircon also suchs.
Certainly, glad you found it interesting.
Fantastic work. I've been looking into how to get a microcontroller (e.g Arduino) to control the system instead of that AC amplifier. Would you happen to have a schematic on what each of the output wires are meant to be doing? I've got a vague idea based on the Delanair Mk2 PDF getting around, but not 100% sure. Also (and this is a long shot), would you happen to have a schematic for the servo motor unit and what the inputs/outputs are (and ideally what the various behaviours are - in software speak we'd call it the interface spec)? Thanks.
Hi Tim. I considered the Arduino for this latest board but decided that it was overkill, and stuck with the discrete components. The system is basically a mechanical servo and servo driver. Controlling it is straight forward. I can tell you what all the wires do. Drop me a note at novom2001@yahoo.com and send me your email address. It will be interesting to see what you come up with.
In your exploration of this system, have you figured out exactly what the hot - cold 'air' dial under the radio actually does?
It's purpose in life is to change the temperature of the air going to the face level vents. It is really only effective in the middle temps, near 75 degrees where the system is mixing hot and cold. Does nothing with max A/C or heat. The control is connected to a mixing door that will change the hot/cold mix to the face vents.
Hey man I was wondering where the ac amplifier plugs in. I recently bought my series 3 and found the ac amplifier not plugged in by LH of the console
Any help would be greatly appreciated
The amp itself lives in a little cubby behind the large, main A/C relay. If yours is still there, there will be a pigtail with a round connector coming from the amp, as well as a black wire with a fuse in it that connects to one of the studs on the front of the unit. The amp connection to the car should be a matching round connector that will be somewhere very close by. You can find this connection by removing the LH console side panel, but sometimes it will be hidden under some of the wiring and hard to see. The connection is located aft of the relay.
Greetings, a couple guys said that they might be interested if I could put together a board to sell. I had a few printed circuit boards made and I can now offer them. It is a slightly different circuit and I plan to put up a video in a few days but the idea is exactly the same. I have been running the first one for the past week, and it appears to work as advertised.
Just sent you an email
Hey 👋 have you ever seen the servo controller motor that's weak the one I'm working on has no heating I've fingered it down to the motor in the servo unit or am I barking up the wrong tree and the amplifier is not strong enough?
Greetings, I have never heard of a weak servo motor. I have seen them fail completely and once I saw the gears stripped. You can test the motor by disconnecting the connector for the amplifier, on the LH side of the console, and connecting 12Volts and Ground across to the Red and Purple wires. For example, connect 12V to the Red wire and Ground to the Purple wire and the servo should run until it reaches it's limit unless it is already at the limit. When the motor stops running reverse the polarity of the wires (Red wire to Ground and Purple wire to 12Volts). The motor should them run to the opposite limit switch and stop. If you have the fan speed control set to AUTO, you should hear the fan speed change as the motor runs. This will test your servo motor.
There is also a possibility that, if all works except heat, your problem is with the themo switch on the water lines going into the heater. It's purpose is to prevent the fans, and therefore the heat, from coming on until the engine is warm. It is located on the water inlet pipes that go from the engine and you can find it in the area above the handbrake, near the firewall, on a LH drive car.
Good luck.
@@novom2001 it's a v12 RHD started with the basics coolant flush 2 new thermostats,new temp sensor (gauge sensor) confirmed the water valve works, the low speed part of the relay box had failed (fixed with some solder) removed the amp and clonked it with a screw driver, tryed to power the servo motor through the red and purple wires no joy had to remove the servo unit and power the motor directly from the terminals on the motor from this point there was movement when setting temperature but as soon as connect it back up with the bars for the flaps it just doesn't seam to have the umph to keep turning, at one point last night I went from 55f to 112f and back to 65f so I'm getting close
@@TheEvocarlos
It does sound like there is a problem with the servo if you are running it directly from the motor wires.
You have removed all the other possibilities except for a problem with one of the flaps that are connected to the servo.
@@novom2001 seams that wetting all the solder joints through and washing the grease off the gears and running a bit of gun oil on the gears has cured the problem all seams to be working as it should now
Thanks for the help :) do you have a itemised list of parts for the amplifier looks like an interesting build I would like to make one for the future just in case :)
@@TheEvocarlos
Happy to help and glad you got it working. I do have a parts list but I am out of town. I should be home tomorrow.
Send your email address to info@thisoldjag.com and I will send you the parts list.
I am interested in building one of these. How do we get in touch if you are happy to share the schematic? Thanks.
Send me your email to novom2001@yahoo.com.
Any chance you would build one to sell?
I would have to give that some thought. I build it using a protoboard and point-to-point wiring, so it is pretty time consuming. It is something that a hobbyist would do for fun on a rainy Sunday. I have thought about making up a printed circuit board that would greatly speed up the process. Let me think about it.
Which car do you have? Do you still have the original unit so that the wiring pigtail can be used?
Novom2001, I'd also consider buying one if you decided you wanted to go down that path.
@@andypaine7489
I'll proceed with the idea of getting a circuit board printed. It is a pretty simple circuit.
For what it worth, I do not have a case for the board. I just wrap it in a piece of leather and lay it inside the console. No problems in 10 years, so I guess this works. Also if you want it tested I will need the pigtail from your amplifier. We can talk about that once I get a working circuit board.
@@novom2001 Sounds great.
@@andypaine7489 I've worked out a slightly different design with a different motor controller and plan to breadboard it tomorrow. If it works ok, I'll order the boards next week.
Hi. Would you please prepare one for me.
Thanks alot
M.Seraj
I will be happy to do so. Please contact me at info@thisoldjag.com and I will send you the information.