Jag-Aire

Jag-Aire Jag-Aire is a manufacturer of replacement Delanair MKII AC control amplifiers for Jaguar cars

Jag-Aire, LLC is a manufacturer of replacement Delanair MKII Air Conditioning control amplifiers and other accessories for 1974-1987 Jaguar XJ6, XJ12, and XJS Series 2 & 3 luxury vehicles. As an avid owner and collector of Jaguar automobiles, I became tired of sweating in the summer heat or freezing in the winter cold because my XJ-S AC amplifier had a mind of its own. Discouraged that I had to re

sort to 30 year old used AC amplifiers, because new amplifiers were not available; I began developing my own replacement. Jag-Aire, LLC was born in 2016 to bring quality replacement AC amplifiers and accessories to other Jaguar Enthusiasts.

So I have been thinking about colors for the 75 Jaguar XJ6L...I know it seems a bit early...but i need to consider engin...
12/10/2025

So I have been thinking about colors for the 75 Jaguar XJ6L...I know it seems a bit early...but i need to consider engine colors and how they compliment body color etc.

So generally speaking I have been thinking a dark color...because the chrome pops on these older cars...

My car originally was a Dark Turd Brown...(i know Jaguar has a different name for it..but i call it as I see it).

Im planning on a 5 speed manual transmission conversion..so it won't be original...and Im thinking something to be a bit different...

I've dropped some sample pictures to see what my peeps might think.

Picture 1: Jaguar Turd Brown
Picture 2: Bentley Flame Orange
Picture 3: Jaguar Silver
Picture 4: Jaguar Sage Green
Picture 5: Traditional Black
Picture 6: Modern brown / bronze (BMW or GM)

Tell me what you think...i'm beginning to develop a favorite.

05/14/2025

Apparently, I can't upload videos and pictures at the same time...here is a short video of the proper Ohm readings on a servo running from full Cool limit to full heat 7 Ohms...check out the.previpus post for more details.

Today...Let's talk Delanair MKII servos.First...there are several variations of servos...they are all interchangeable. ...
05/14/2025

Today...Let's talk Delanair MKII servos.

First...there are several variations of servos...they are all interchangeable. Most of the changes center around the gear train and the motor control board, or whether they have a Ranco Thermostat bypass switch.

The first picture:

top...a series III servo
Bottom...still a series III...but very early and shares its design with late series II servos...note the difference in gear train configuration and motor control board.

Generally speaking series II servos are less desirable...they frequently suffer from stripped teeth on the fiber gear...or a spun main gear on the camshaft. They run slower and can suffer cracked plastic cam lobes...especially on the flap actuators.

Series 2 generally has an open frame Feedback potentiometer which more often suffers from dirt and corrosion.

Lastly...series 2 servos utilized 4 mounting screws in the base plate..where as series 3 use a single stud and pin...which makes them much easier to remove.

In the second/third picture...you can see the feedback potentiometer has been removed at some point and reinstalled in the incorrect position...the limit tab is bent. This servo will never work in a car....proper "clocking" of the feedback pot is imperative.

Feedback pot testing:

Orange and Yellow wires should provide ~2.2 KOhms across the entire resistive path.

I use Orange and Green for my testing...(if you use yellow and Green...your values will be reciprocal)

In full heat..you should have a low Ohms reading...it varies..but somewhere between 0-100 Ohms is normal.

In full cold...you should get close to full resistance but usually anything over 2.0 KOhms is fine.

This is important...you will test the resistance between Orange and Green while running the motor between limits...you should see a steady rise ( fall ) of the resistance thru out the entire range..if the signal drops out...the feedback pot is dirty and must be removed, cleaned, l**e with dielectric grease, reassembled and clocked back to the servo cam. (Note: if you use an Auto Ranging meter..a value blink around 400 Ohms..is not a fault..but the meter changing ranges)

This resistance value tells the amplifier what position the servo is in..and balances the two legs of the amplifier circuit. As the temp increases (decreases) the in-car and ambient temp sensors change value..throwing the system out of balance...causing the amplifier to move the servo...until the resistance is balanced again across the feedback pot.

Made up a quick tool today to easily remove the nuts for the climate control face panel on the Jaguar xj6 and xjs models...
05/12/2025

Made up a quick tool today to easily remove the nuts for the climate control face panel on the Jaguar xj6 and xjs models from 1975-1995

05/04/2025

All the replacemet electronic parts came in and i was able to rebuild the Darlington speed controls today.. I reassembled the fans and charged my booster pack. And finally hooked up a vacuum source. All of the system checks appear to be working..and I now have functioning LOW and MED fan speeds as well as HIGH.

I cannot run the tests long as the fans seriously deplete my booster pack....and when the voltage gets low...wired things happen (mostly fan surge).

Couple more tests with different ambient temperatures (heat and cold source to test the sensor responsiveness) and i think i will be able to call this service complete.

Climate control speed controller board (Darlington board) rebuild begins.I used the parts list from the Jag-Lovers Forum...
04/28/2025

Climate control speed controller board (Darlington board) rebuild begins.

I used the parts list from the Jag-Lovers Forum and rebuild instructions...which was written in 2000...some parts were not longer listed...but i was able to find alternates i believe will work.

Once parts arrive and confirmed to work...I will post the complete parts list and source soon after.

I am working with a customer (Beautiful 77 XJS from prior post) on his Delanair MK III (94 update so MKIV?) to be instal...
04/23/2025

I am working with a customer (Beautiful 77 XJS from prior post) on his Delanair MK III (94 update so MKIV?) to be installed in his 77 XJS.

He scheduled an appointment and drove up to the shop with his entire system mounted to a board and mocked up for testing.

First let me say...Delanair MKIII's are not my strong point, but this was a great opportunity to learn.

Initial testing had very mixed results...nothing was quite working as expected. None of the vacuum system was working, and blend air doors were not responding as expected.

After several hours he agreed to leave the system for me to dive deeper for diagnostics and learning.

After he left, I started pulling components and bench testing the various pieces.

After several hours of testing and reassembly...I discovered the Temperature Selector Switch wired incorrectly.

Things are looking up!

I have the vacuum system working, the temp selector now has control of the blend flaps.

I still have a fan speed issue to resolve, but making great progress!

This beautiful 1977 Jaguar XJS belongs to a customer...who is currently working to install a Delanair MK III HVAC system...
02/09/2025

This beautiful 1977 Jaguar XJS belongs to a customer...who is currently working to install a Delanair MK III HVAC system.

I was contacted to help source some missing parts. That task completed...I now have a much better understanding of the MK III system....and the customer will have a "cool" ride 😁

During a rebuild of a customers Series 2 XJ6 servo...I found a significant problem.When I received the servo...I was fir...
12/30/2024

During a rebuild of a customers Series 2 XJ6 servo...I found a significant problem.

When I received the servo...I was first amazed at how clean it was compared to other servos. Next I observed that the 2 micro switches on the end of the servo where missing.

A quick test proved that the motor would not function...

I dug in and disassembled the gear set...confirmed all gears where in good condition and removed the old nasty tar like grease.

In a more detailed diagnostics...I found the motor to be fine...but realized...this servo must have been taken apart before by someone in the past.

The first telltale sign...the limit tab on the feedback potentiometer was bent...indicating that the servo was reassembled with the feedback pot out of 'time' and clocked wrong.

The next discovery...the motor limit switches had been replaced with the wrong switches. Apparently the previous person had used the switches from the end of the servo instead...preventing the servo motor from receiving power.

Below I provided a comparison of the switches...the switches in my hand are the limit switches as recieved...normally open...

The correct limit switches should be "Normally Closed"

Reassembled and back in working condition

Well that was a challenge...after a couple hours wrangling hose clamps...stuck hoses...limited space and an aching back....
10/03/2024

Well that was a challenge...after a couple hours wrangling hose clamps...stuck hoses...limited space and an aching back...I finally got the old coolant crossover pipe out.

The original pipe was rusted and leaking when I bought the car many years ago...so I brazed it up the best I could...and it's held for these last 15 years.

But a coolant leak developed and I figured if I was gonna fight this again...I would replace the pipe.

I found a stainless steel replacement from Simply Performance Jaguar in Beare Green, Dorking, United Kingdom. Love supporting other small Jaguar shops like myself.

Now the question is...do I replace the 39 year old water pump while I'm in there? Bearings are good...but 39 year old rubber seals?...

Never mind...I've decided to order the water pump.

Cheers!

Spent some time working on the CAD files for a couple of the heater box actuator flap arms.I have a couple more to model...
07/18/2024

Spent some time working on the CAD files for a couple of the heater box actuator flap arms.

I have a couple more to model..but then I will have the ability to make entire replacement sets.

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