300Tdi cooler fan relay gone crazy - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old April 22nd, 2009, 02:36 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
300Tdi cooler fan relay gone crazy

The first symptom was the cooler fan running as soon
as engine was started in the morning. Usually, switching
ON then OFF A/C blower fan was enoug to shut down the cooler fan.
Now the cooler fan relay is triggering like mad.

I've been looking at electric diagram, the activator relay
circuit goes from fuse Nļ 15 to relay then to A/C switch
fan. How this circuit knows when engine is hot ? If i find
the relation beetween engine temp. and relay circuit, then
may be i'll find the fault.

Any A/C electric knowledge to share ?

Thanks
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old April 23rd, 2009, 10:14 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
Find what is controling relay, it's a switch
on thermostat housing. Anyone know the
part number ? It seems not to be on the
part catalog.
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #3  
Old April 23rd, 2009, 10:23 PM
JimC's Avatar
JimC
Status: Offline
Jim Cheney
NAS 110 #145
Site Team
 
Join Date: Sep 2003
Location: Stuttgart, Germany
Posts: 7,154
Registry
There are two switches that should be checked here - both the thermo switches on the thermostat housing and the trinary switch on the AC receiver drier. The trinary switch takes binary temperature input and binary pressure input from itself to decide 1) whether or not the cooling fan should be on and 2) to shut off the compressor as a high temp or low pressure failure mode.
__________________
Jim Cheney

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old April 23rd, 2009, 10:47 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
Jim, i have no switch on the A/C receiver-drier, nothing
electric at all, just 2 pipes ...

I have 2 switchs and 1 sensor on the thermostat housing.
One of those switch seems to be wired to the relay, same
wire color and size and i checked for continuity. The earth of
that switch seems to be all right also. My only explanation
so far is that this switch is defective, i think i will have to take
it out just to check part number.
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #5  
Old April 23rd, 2009, 11:41 PM
Stmpede's Avatar
Stmpede
Status: Offline
Andrew Najarian
'93 NAS D110 #43
Member
 
Join Date: Mar 2007
Location: Jacksonville, FL
Posts: 2,459
Have you checked the relay? If the switch was telling it to go on it should stay on after cycling the A/C switch I think. When relays go bad they have a tendency to chatter or stick in either position. If it is chattering I would check both the relay itself and the ground to the relay. If there is a bad ground to the relay it will cause all sorts of problems.
__________________
"I have taken more good from alcohol than alcohol has taken from me." - Winston Churchill
Reply With Quote
  #6  
Old April 24th, 2009, 08:10 AM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
Yeah, i changed the relay already, same issue.
The ground goes thru the switch on the
thermostat housing, and after the switch
it is all right.
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #7  
Old April 27th, 2009, 11:31 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
I found the part number of the thermostat elbow,
ERR3738, i'm missing the part number of both
switches under it.

Anyone ?
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #8  
Old April 29th, 2009, 09:08 PM
JFD's Avatar
JFD
Status: Offline
Julien Dalbin
05 Tdi 90
Member
 
Join Date: Mar 2005
Location: Dominican Republic
Posts: 1,888
Got them

From the front of the vehicle, first one is PRC3366
and second is PRC3541.

In my case, i think PRC3541 is giving erratic signal
to fan relay, i'll change it and see what will happen.

In order, the old, the new and the elbow:
Attached Thumbnails
Click image for larger version

Name:	Old.jpg
Views:	83
Size:	23.2 KB
ID:	19167   Click image for larger version

Name:	New.jpg
Views:	85
Size:	21.7 KB
ID:	19168  

Click image for larger version

Name:	Elbow.jpg
Views:	142
Size:	22.5 KB
ID:	19169  
__________________
" Eventually everything connects - people, ideas, objects. The quality of the connections is the key to quality per se. "
- Charles Eames
Reply With Quote
  #9  
Old April 7th, 2012, 05:54 PM
323jamie's Avatar
323jamie
Status: Offline
jamie
83 D110 RHD 300tdi Disco conversion
Member
 
Join Date: Sep 2010
Location: TX
Posts: 174
Registry
do you have an ac? is this what the double sensors are for?
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
300tdi, fan, relay, tdi

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
300Tdi Fan shroud and fan Buckon37s For Sale - Parts 1 December 18th, 2009 10:46 AM
300tdi remote oil cooler? D90user Defender Technical Discussions 7 December 1st, 2008 04:30 PM
Relay replacement help cgalpin Defender Technical Discussions 21 April 18th, 2005 07:42 AM
ARB Bumper 97 Transmission Cooler Caution dnewman9 Defender Technical Discussions 4 September 8th, 2004 12:51 AM
Mounting 3-Link Crossmember on 300tdi chassis Chris Cox Defender Technical Discussions 4 March 10th, 2004 02:12 PM


All times are GMT -5. The time now is 06:46 PM.


Copyright