The largest and best supported Jaguar cars enthusiast site on the Internet!

Serving Enthusiasts since 1993
The Jag-lovers Web

Currently with 3,166 members

Jag-lovers' Ebooks
- Jag-Lovers' xj40 Ebook -

9.3 - AC Computer ( )

See warning at beginning of section 9.1 page *.

These are often replaced erroneously. The standard of assembly of the Delanaire unit is very high (in stark contrast to the blower assembly electronics!). The board is even conformally coated, which is an expensive process meant to enhance reliability in difficult environments. As the unit sits in a nice plastic enclosure, in an air-conditioned environment, with little electrical stress, this should be one of the most reliable assemblies on the whole car! Apart from abuse by the PO, replacement of the ACC should definitely be an option of last resort!

As an example, very erratic operation of the A/C, sometimes OK, sometimes wrong settings (hot on hot days and vice versa!), sometimes no action at all may be blamed on the computer - but in fact can be due to moisture coming out of the evaporator, running down the RHS of the transmission tunnel onto the single in-line fuse holder that carries the supply current to the AC computer. The contacts corrode slightly, breaking the supply current, and giving intermittent operation of the ACC. A new inline fuse, plus fixing the drainage, will solve this problem.


sepbar.jpg (3094 bytes)

This section currently maintained by Pascal Gademer; questions, comments, submissions and suggestions, email


Please help support the move to the new site, and DONATE what you can.
A big Thank You to those who have donated already!



Go to our Homepage
Improve your Jag-lovers experience with the Mozilla FireFox Browser!

  View the latest posts from our Forums via an RSS Feed!

Jag-loversTM Ltd / JagWEBTM 1993 - 2022
All rights reserved. Jag-lovers is supported by JagWEBTM
For Terms of Use and General Rules see our Disclaimer
Use of the Jag-lovers logo or trademark name on sites other than Jag-lovers itself in a manner implying endorsement of commercial activities whatsoever is prohibited. Sections of this Web Site may publish members and visitors comments, opinion and photographs/images - Jag-lovers Ltd does not assume or have any responsibility or any liability for members comments or opinions, nor does it claim ownership or copyright of any material that belongs to the original poster including images. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England. Some images may also be Jaguar Cars. Mirroring or downloading of this site or the publication of material or any extracts therefrom in original or altered form from these pages onto other sites (including reproduction by any other Jaguar enthusiast sites) without express permission violates Jag-lovers Ltd copyright and is prohibited
Go to our Homepage
Your Browser is: CCBot/2.0 (, IP Address logged as on 27th Jun 2022 05:28:44