XJ6 & XJ12 Series I, II & III 1968-1992

Aux cooling fan question

 
  #1  
Old 09-09-2016, 06:37 AM
Darrenmb's Avatar
Veteran Member
Thread Starter
Join Date: Oct 2010
Location: Orlando Florida
Posts: 1,715
Received 278 Likes on 182 Posts
Default Aux cooling fan question

Is the fan supposed to come on when ac is on, or is it just temp related? Noticed it wasnt running after a drive yesterday, and it usually is
 
  #2  
Old 09-09-2016, 06:56 AM
Join Date: Feb 2010
Location: Adelaide Stralia
Posts: 19,651
Received 5,829 Likes on 4,178 Posts
Default

Not 100% on you markets requirements, or the 6 cylinder setup, BUT,

My understanding is;

The Aux fan IS wired to the A/C circuit in some markets.
The Aux fan is also wired to come ON if the lower hose temp sets the switch off, and will stay ON after shutdown, until a predetermined temp is reached. If that fan is OFF at shutdown, it will stay OFF, no matter how much heat rise may take place.

Owners often report more activity with that fan, and it usually leads to a clogged radiator causing a slightly higher engine temp.
 
The following users liked this post:
Ahabiam (09-15-2016)
  #3  
Old 09-09-2016, 08:54 AM
alynmurray's Avatar
Senior Member
Join Date: Jan 2014
Location: Seattle
Posts: 577
Received 228 Likes on 140 Posts
Default

Yes I just reused that entire fan circuit (wiring only - omitted the small fan and connected the wiring to one of the fans in my dual efan setup - this is my V8 conversion set up).

The trigger wire to the red relay comes from temp sensor (at a preset temp value) located at the lower section of the Jag radiator. Power comes from a fuse in the same box as the headlight fuses Fuse #1 ...IIRC.

On my GM 350 I used a temp sender that is screwed into the thermostat housing,...wired it from there .

Wiring arrangement enables the fan to continue operating after engine shut down - just like the Jag set up.
 
  #4  
Old 09-09-2016, 08:55 AM
Veteran Member
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 20,149
Received 6,548 Likes on 4,860 Posts
Default

Originally Posted by Darrenmb View Post
Is the fan supposed to come on when ac is on?

V12, yes.

Six cylinder, no.

Assuming a Series III. Not Sure about Series I and II



Cheers
DD
 
  #5  
Old 09-13-2016, 05:33 AM
Jose's Avatar
Veteran Member
Join Date: Mar 2007
Location: Florida
Posts: 5,822
Received 1,338 Likes on 1,088 Posts
Default

In the 6 cylinder Series 3 XJ, the auxiliary fan can be rewired to come on everytime the a/c is on, very simple mod, however that little fan is noisy so the car starts to sound like a Maserati.
 
  #6  
Old 09-13-2016, 05:40 AM
Jose's Avatar
Veteran Member
Join Date: Mar 2007
Location: Florida
Posts: 5,822
Received 1,338 Likes on 1,088 Posts
Default

Check the fifth fuse in the 5-fuse fusebox located next to the coolant-fill tank, it usually is the reason the fan does not come on.
 

Last edited by Jose; 09-13-2016 at 02:19 PM.
  #7  
Old 09-13-2016, 06:59 AM
Darrenmb's Avatar
Veteran Member
Thread Starter
Join Date: Oct 2010
Location: Orlando Florida
Posts: 1,715
Received 278 Likes on 182 Posts
Default

Thank you, everyone
 
  #8  
Old 09-13-2016, 08:18 AM
Veteran Member
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 5,732
Received 1,945 Likes on 1,569 Posts
Default

The auxiliary fan that was on my 83 is hanging on the shop wall, along with another of unknown etiology. Camaro (?). Each kinda puny. If I were not such a pack rat, I'd dump both!!


As wired, my car has no fan run after shut down. Although one is wired to come on irrespective of temperature when the AC is engaged. Not sure I like that idea. And, if ever, I charge the AC, I may not plug it in.


The two PCM Efans outta do the job.


Carl
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
cdc
XJ XJ8 / XJR ( X308 )
3
06-13-2019 07:45 AM
SCMike
PRIVATE For Sale / Trade or Buy Classifieds
1
09-17-2016 07:56 PM
mhamilton
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
2
09-06-2016 07:04 AM
Tutti57
XJ40 ( XJ81 )
9
09-04-2016 04:47 PM
Carznguitarz
X-Type ( X400 )
2
09-03-2016 04:48 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: Aux cooling fan question


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: