overheat ONLY with AC? - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old August 24th, 2005, 02:45 PM
scubadanster
Status: Offline
daniel park
1997 defender 90
Member
 
Join Date: Nov 2004
Location: long beach, ca, USA
Posts: 171
overheat ONLY with AC?

hey gang~
my 1997 90 only overheats when the ac is on for a while....

i recored my radiator, have a new water pump....

why would this happen??

please advise~

much appreciated...

-dan
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old August 24th, 2005, 05:25 PM
jaherring's Avatar
jaherring
Status: Offline
Jason Herring
94 D90 ST #1253
Member
 
Join Date: May 2004
Location: San Pedro, CA, USA
Posts: 582
Not sure on 1997, but on 1994 there is a temperature switch that turns on an auxiliary electric fan in front of the A/C radiator - make sure this is turning on your aux fan (it's located on the thermostat housing) when the A/C is running and the engine is warmed up.

You can probably jump the connector with a paper clip to see if the fan is working as well (simulating the switch being closed).

If you don't have that fan, I'm not sure what the problem could be - it could then be alot of things....that's the only "easy problem" I can think of.
Reply With Quote
  #3  
Old August 24th, 2005, 06:47 PM
Mike Hippert's Avatar
Mike Hippert
Status: Offline
D-90Slut/Stalker,SNLPres
94 D-90 Grinding Rover
Member
 
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,789
Does it happen on the highway as well as in traffic? Does the temp go into the red? How long does it take to get hot?
__________________
Don't forget to
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
first then ask questions later! The loose nut behind the wheel
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old August 24th, 2005, 06:57 PM
javelinadave
Status: Offline
-
-
Member
 
Join Date: Sep 2003
Location: -
Posts: 5,394
Quote:
Originally Posted by jaherring
Not sure on 1997, but on 1994 there is a temperature switch that turns on an auxiliary electric fan in front of the A/C radiator - make sure this is turning on your aux fan (it's located on the thermostat housing) when the A/C is running and the engine is warmed up.

You can probably jump the connector with a paper clip to see if the fan is working as well (simulating the switch being closed).

If you don't have that fan, I'm not sure what the problem could be - it could then be alot of things....that's the only "easy problem" I can think of.
That fan only turns on when your radiator/engine are about to reach critical mass (melt down) on a 97. If you still have your viscous coupling and fan pitch it and get electric fans instead. I live in Phoenix, drive a 97 with A/C and it made a huge difference once i switched to the Flex-Lite fans.
Reply With Quote
  #5  
Old August 24th, 2005, 09:20 PM
jaherring's Avatar
jaherring
Status: Offline
Jason Herring
94 D90 ST #1253
Member
 
Join Date: May 2004
Location: San Pedro, CA, USA
Posts: 582
I have the electric fans on mine and I'm going to install A/C in it & will soon have that third fan. I plan to wire them all to turn on with the same thermostat switch so I should have no problems staying cool with pusher and puller electric fans... that coupled with my 4-core radiator and soon a new water pump I hope I'm good to go.
Reply With Quote
  #6  
Old August 24th, 2005, 10:08 PM
scubadanster
Status: Offline
daniel park
1997 defender 90
Member
 
Join Date: Nov 2004
Location: long beach, ca, USA
Posts: 171
yikes!
sounds like more money!

why didn't they place a better fan, a/c design??? grrrrrrrr.......

-dan
Reply With Quote
  #7  
Old August 25th, 2005, 05:21 PM
jaherring's Avatar
jaherring
Status: Offline
Jason Herring
94 D90 ST #1253
Member
 
Join Date: May 2004
Location: San Pedro, CA, USA
Posts: 582
I'm just paranoid of overheating I go out into the desert on very hot days sometimes - thus the A/C needs to be blowing cold and the engine not running hot.

You can always make that auxiliary fan come on at a lower temperature if you want to (have you checked to make sure it's working??) with an override switch, or a thermostat switch (one style you can find at your local auto parts store in the same section they sell electric cooling fans..).
Reply With Quote
  #8  
Old August 26th, 2005, 01:53 AM
scubadanster
Status: Offline
daniel park
1997 defender 90
Member
 
Join Date: Nov 2004
Location: long beach, ca, USA
Posts: 171
a-ha....

good to know....

and no, i haven't checked my fan yet......not quite sure i know how to! =(

-dan
Reply With Quote
  #9  
Old August 27th, 2005, 10:23 AM
Mike Hippert's Avatar
Mike Hippert
Status: Offline
D-90Slut/Stalker,SNLPres
94 D-90 Grinding Rover
Member
 
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,789
The clutch fan is pretty easy to check. Try turning the fan while the engine is cool (not running of course!) , then try again when the engine is hot, it should be harder to turn it when the engine is hot, if it spinns pretty freely then your clutch fan is on the way out.
__________________
Don't forget to
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
first then ask questions later! The loose nut behind the wheel
Reply With Quote
Reply

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

Tags
ac

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
1997 NAS Defender 90 AC kits ECR The Vendors Loft 2 December 22nd, 2009 07:18 PM
Overheating with AC on nmc Defender Technical Discussions 9 July 28th, 2009 08:13 PM
WTB 97 NAS D90 AC system ECR Wanted 7 July 16th, 2008 07:58 AM
Making AC Lines Lesandjes Defender Technical Discussions 3 July 10th, 2008 12:58 AM
overheat again Ray Bone Defender Technical Discussions 11 September 2nd, 2005 05:13 PM


All times are GMT -5. The time now is 05:09 PM.


Copyright