Wild temp swings in 2.5 NAD - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old September 6th, 2015, 11:18 PM
Towns03
Status: Offline
Townsend
'87 Defender 110
Member
 
Join Date: Sep 2015
Location: Houston, Texas
Posts: 20
Smile Wild temp swings in 2.5 NAD

Hello DS team! I'm new to everything Land Rover and everything 2.5 NAD. actually, I just picked up this ex-mod '87 110 on Friday and am trying to figure everything out. in the process I can't stop driving the thing.

Today while cruising around town at 60 MPH the temp gauge was starting to run warm/hot. Without any noticeable sounds the shown temp would cool and heat up in wild swings. it might move from right in the middle to 3/4 of the way to the red in three seconds and back again. OR from 3/4 of the way into the red and back. the swings kept getting hotter and hotter near the end of a one hour trip. at the end I was fully in the red and the 'cool' swings weren't dropping back out of the red. Am I about to over heat? is this a thermostat issue? or a pump issue? does the pump run off of the fan clutch?

thanks for the help!

p.s. Is there a consensus for ordering parts here in the US? Do people order parts from ebay.uk?

TIA


Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old September 7th, 2015, 12:09 AM
Daddymow's Avatar
Daddymow
Status: Offline
Raub A.
1987 D110 Tithonus
Member
 
Join Date: Oct 2011
Location: Stuart, FL / Boone, NC
Posts: 3,970
Registry
Nice looking truck. The best part you can order for your truck is a 200Tdi.
__________________
You can't polish a turd but you can roll it in glitter - eBay.uk ad for Freelander.
Reply With Quote
  #3  
Old September 7th, 2015, 12:31 AM
airbornrover's Avatar
airbornrover
Status: Offline
William Skidmore
SIII 109 SW
Member
 
Join Date: Oct 2004
Location: Land by parkway and 33
Posts: 1,882
First thing first. Buy what ever owners manual for your truck, at same time buy the parts catalouge for your truck (yes you can download free pdf's of these items). Shot in the dark, im going to say its either your thermostat is going TU or something electrical is going out. I may or may not be intoxicated at the momemt. If you dont have a multimeter find a buddy that does or buy one, think you can get a loaner from any auto part store.

You can buy tons of parts from this side of the pond. You are in the middle of this country so I dont know how shipping is going to be for you from the UK.
__________________
Quote:
Just to be clear, i was not bragging. i was calling you a pussy. Ren Ching
There is nothing as permanent as a temporary fix. JSBriggs
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old September 7th, 2015, 06:25 AM
steinhnj's Avatar
steinhnj
Status: Online
Neil Steinhagen
1990 Perentie GS
Member
 
Join Date: Apr 2006
Location: Periscope Depth
Posts: 759
My Tithonus did the same thing. If you have an IR temp gun, shoot the water pump housing. IIRC temp should be about 130F. If you don't have an IR temp gun, buy one. The piece of mind is well worth the price.

Do you have a water temp gage and an oil temp gage? Do they both track?

I narrowed mine down to the light switch. It was an electrical issue. If it only overheats at dusk, that may be your problem.

Neil
Reply With Quote
  #5  
Old September 7th, 2015, 07:29 AM
Rocky's Avatar
Rocky
Status: Online
Chris
72 + D1 drivetrain
Member
 
Join Date: Sep 2006
Location: Colonies Aka Boston
Posts: 8,771
You'll find most parts available here in the US from the regular sources such as Rovers North, Atlantic British, Safari HP, Lucky 8.
__________________
A friend of mine runs a land rover / range rover specialty repair shop. Based on his experience, they are capable of stopping anywhere, anytime, at any cost.

I don't know about the brakes, only their unreliability.
Reply With Quote
  #6  
Old September 7th, 2015, 07:38 AM
BlackField's Avatar
BlackField
Status: Offline
Oscar
D110
Member
 
Join Date: Mar 2012
Location: NYC
Posts: 1,640
Quote:
Originally Posted by steinhnj View Post
My Tithonus did the same thing. If you have an IR temp gun, shoot the water pump housing. IIRC temp should be about 130F. If you don't have an IR temp gun, buy one. The piece of mind is well worth the price.

Do you have a water temp gage and an oil temp gage? Do they both track?

I narrowed mine down to the light switch. It was an electrical issue. If it only overheats at dusk, that may be your problem.

Neil
Just curious if your 130F figure is supposed to reflect that there is 130F coolant flowing through the Tstat housing or if you accounted for cooling?

I have an IR gun and have shot my Tstat housing but I'm getting 180F ish (there is a compatibility issue with my coolant sending unit and my EMS).
__________________
Lemmings as you know them are a Disney fabricated lie. The truth is out there.
Reply With Quote
  #7  
Old September 7th, 2015, 09:07 AM
RiftRover's Avatar
RiftRover
Status: Online
Mike Barnett
110
Member
 
Join Date: Apr 2009
Location: Little Rock, Arkansas
Posts: 813
I had the same issue in my car recently and it turned out that one of the radiator hoses wasn't on tight. I couldn't see coolant leaking but as soon as it was tightened up it the gauge stopped fluctuating.
Reply With Quote
  #8  
Old September 7th, 2015, 10:04 AM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,835
Registry
Since no one else has said anything, do not drive a truck with the gauge in the red. Yes in the red is overheating and yes you can ruin your engine. You can warp your head and blow a head gasket or worse. A diesel will blow a head gasket quickly when run hot as pressures are twice what they are in a gasoline engine.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Vehicle Shipment and Importation Service
Restoration & Modification work


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

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #9  
Old September 7th, 2015, 10:17 AM
Jymmiejamz's Avatar
Jymmiejamz
Status: Offline
Jimmy
1995 D90 SW #365
Member
 
Join Date: Sep 2010
Location: Brooklyn, NY
Posts: 3,468
Registry
Also, check the coolant level.
__________________
Car Camping Collective founding member and Treasurer
Reply With Quote
  #10  
Old September 7th, 2015, 10:20 AM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,835
Registry
Quote:
Originally Posted by Jymmiejamz View Post
Also, check the coolant level.
yep,sage advice, I'd do that before going and getting my IR gun.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Vehicle Shipment and Importation Service
Restoration & Modification work


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

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #11  
Old September 7th, 2015, 10:44 AM
ranewman's Avatar
ranewman
Status: Offline
Rick Newman
85 Defender 110
Member
 
Join Date: Dec 2011
Location: Unionville, Va
Posts: 1,444
Quote:
Originally Posted by Uncle Douglas View Post
yep,sage advice, I'd do that before going and getting my IR gun.
Now why would you want to do that and not go high tec before the simple things? Kill joy....
__________________
Rick
06 L322 Range Rover "The Black Pearl"
06 L322 Range Rover "2.0"
97 Disco SD "Emma" (250k and going strong)
95 P38 "Gus" RIP
99 P38 Callaway Edition #106 RIP
85 Defender 110 2.5NA "Margret"
01 D2 SE7 "Cuzn It" (blown up POS)
03 D2 SE "Fred"
Hoarder of 2.5 NAD parts
"In God we trust. Everyone else keep their fucking hands where they can be seen."
Reply With Quote
  #12  
Old September 7th, 2015, 11:33 AM
Towns03
Status: Offline
Townsend
'87 Defender 110
Member
 
Join Date: Sep 2015
Location: Houston, Texas
Posts: 20
Thumbs up

Quote:
Originally Posted by steinhnj View Post
My Tithonus did the same thing. If you have an IR temp gun, shoot the water pump housing. IIRC temp should be about 130F. If you don't have an IR temp gun, buy one. The piece of mind is well worth the price.

Do you have a water temp gage and an oil temp gage? Do they both track?

I narrowed mine down to the light switch. It was an electrical issue. If it only overheats at dusk, that may be your problem.

Neil
thanks for the tip! for someone new to the game how do I get a line of sight to the pump housing?? should I take off the fan guard first?

Also, what would cause the swing of temps? does the pump turn on and off during normal operation? or does the thermostat open and close a bypass of the water?? the swing is very odd and I think it will narrow down the problem.


no, my rig doesn't have a oil pressure or temp gauge. only fuel level and water temp.

------ Follow up post added September 7th, 2015 10:35 AM ------

Quote:
Originally Posted by airbornrover View Post
First thing first. Buy what ever owners manual for your truck, at same time buy the parts catalouge for your truck (yes you can download free pdf's of these items). .
this is a necessary first step, but a tricky one. it looks like there have been a number of different versions of this rig with different engines and trims. where can I find a ex-Mod parts catalogue?? that would help tremendously-
Reply With Quote
  #13  
Old September 7th, 2015, 11:43 AM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,835
Registry
You have the simplest defender ever built. The water pump impeller is turning if the fan belt is turning. Most infared temp guns have a weak laser than pin points where the eye is looking so you know exactly what is what temp. No need to remove anything. There are precious few parts on your truck unique to its military spec. Any shop and or part manual will cover your uber simple 2.5 natural engine.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Vehicle Shipment and Importation Service
Restoration & Modification work


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

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #14  
Old September 7th, 2015, 02:00 PM
D90user's Avatar
D90user
Status: Offline
steve
109/110 ambulance-55 series I
Member
 
Join Date: Oct 2004
Location: Nevada
Posts: 1,447
As Doug said. Do not drive it hot. Check with the IR gauge at the thermostat housing. If its over ~190 don't drive it.

If you are not loosing coolant, and the IR gun is not reading hot, my bet is a ground issue.
An incomplete ground on the engine or gauge side can cause very quick swings in temperature readings.
First thing first. Determine if it is really getting hot.
Reply With Quote
  #15  
Old September 7th, 2015, 02:47 PM
Savage Defender
Status: Offline
L Savage
None
Member
 
Join Date: Jul 2014
Location: Florida, United States
Posts: 67
I'm amazed you got it to 60, sure this wasn't KPH? I have found that the older stock radiators were built for the cooler british weather and have a really hard time keeping up with anything over 70 ambient, major problem for me down here in south Florida. Full oil change and blow out the vents, sometimes its the simple things and as Doug says, if a Defender gets into the red - stop.!! Same with fuel gauge, 1/4 tank means panic, if it gets into the red it's too late!!
Reply With Quote
  #16  
Old September 7th, 2015, 03:50 PM
JohnsD90's Avatar
JohnsD90
Status: Online
John
74 SIII 88", 88 110, 91 110
Member
 
Join Date: Feb 2009
Location: CT
Posts: 2,282
Registry
Do any other gauges give strange readings? your temp seems to be moving very quickly back and forth for me to believe it is reporting an accurate temp.
Reply With Quote
  #17  
Old September 7th, 2015, 05:01 PM
BlackField's Avatar
BlackField
Status: Offline
Oscar
D110
Member
 
Join Date: Mar 2012
Location: NYC
Posts: 1,640
Is there and Ohm to temperature chart for the standard temperature sender? Id like to see one for the 5/8 UNF that goes on the 200TDi (other engines as well I think).
__________________
Lemmings as you know them are a Disney fabricated lie. The truth is out there.
Reply With Quote
Reply

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

Tags
wing

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
Central Texas Wild Hog Hunting...Rovers Welcome! Alaskaptain The Flea Market 3 February 3rd, 2014 05:55 PM
Wild Vegas shooting WeBeCinYa Misc. Chit-Chat 4 February 28th, 2013 06:38 PM
Fuel gauge gone wild flynn23 Defender Technical Discussions 2 January 24th, 2009 08:28 PM
Bowler Wild Cat based on Land Rover rolaro Misc. Chit-Chat 2 December 18th, 2004 09:56 AM
Just a wild thought, anybody up for the Power Tour in 2 years? Hans Misc. Chit-Chat 10 November 25th, 2004 11:32 AM


All times are GMT -5. The time now is 10:31 AM.


Copyright