Over heating issues... Fan recommendation please - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old August 5th, 2012, 08:38 PM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,505
Over heating issues... Fan recommendation please

So after I swapped my front cover to from a v-belt set up to a serpentine belt in order to get the crank driven oil pump (which works great) and combined with Colorado's very high temperatures this summer, I am overheating only when I am going up steep hills when it is over 90F which is every friggn day this summer. My truck is a 4.6 and the radiator I had recored a couple years ago to a 4-core radiator and I run electric fans (Flex a lite 210). I just brought in the radiator to have it checked out and it flows great. I just can't keep up with the heat. I cool off very rapidly when I pull over, and I only get to 210F when I due pull over as when I see it go up, it appears that it won't stop and I don't risk it.

Part of me want to upgrade the fan to something even higher (it is a puller that does 2500 CFM, so pretty darn powerful) but I am thinking that might not do it since I am usually at freeway speeds. The engine pulls awesome--it can go in the 60's to 70's up when going over the hills in Colorado. But something changed when I got the serpentine front cover. The serp cover no longer had a water inlet at the back of the water pump--now I come out of the lower radiator hose and have 2 branches on that lower hose--one from the heat core return and one from the coolant resevoir. So I am thinking that I am not getting as much volume through my radiator as I once did. That is a theory.

I just redid everything, including the thermostat (twice cause it is easy). I have taken IR temps and the radiator is doing it's job. I use water wetter to help with the thermo capacity of the actual coolant.

I am thinking of changing out my front grill and getting a wire mesh one. (baby steps of cooling, every bit helps) and possibly upgrading the fan to something over 2500cfm (but I am doubtful that the fans are doing that great at hwy speeds?).

I would love thoughts and input.

I know trucks well. I built this one from the ground up and the engine from a block up, so I think I have covered most the idiot mistakes. I have adjusted the timing as a trial, I have changed the plugs as a trial just trying to rule everything out. It is running great--great power, plugs look awesome, everything is a go except when it is 95F and I go over rather step hills.

I am all ears :-) Help?
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old August 5th, 2012, 09:36 PM
leastonce's Avatar
leastonce
Status: Offline
Jason England
D-90 White 95 SW #65
Site Team
 
Join Date: Jul 2009
Location: NYC
Posts: 6,078
Registry
Minor head gasket leak ... Compare your plugs to each other

Actually read a bit more ... I guess you don't lose any water at all?
__________________
Quote:
Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
Car Camping Collective founding member and Chief Executive Officer
Cat Camping Collective founding member and Chief Executive Officer
Reply With Quote
  #3  
Old August 5th, 2012, 10:23 PM
Naplm00
Status: Offline
Matthew
1983 110 200tdi 3 door soft top
Member
 
Join Date: Sep 2010
Location: San Jose, California
Posts: 2,863
Other than your possible mechanical issues my fan recommendation is a zirgo zfu16S. It literally fits perfect, the plastic mounts rest on the steel rad surround like it was made for it. I paired it with a spal pm2 electronic fan controller. You can turn it on or off manually, with a.c. and via a temp sensor.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old August 7th, 2012, 01:16 AM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,505
Not losing any coolant. Did a block test and it is fine as far as I can diagnose. And only runs hot on very hot days--just looking for a way to get eeek out just a bit more cooling for these hot ones...

Does anyone know if a wire grill makes any difference compared to the plastic ones when it comes to air flow? Or is there any such thing as a higher flowing water pump?
Reply With Quote
Reply

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

Tags
fan

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
International HS2.8L Michael Defender Technical Discussions 448 April 21st, 2017 04:58 PM
Removing the fan & Fan clutch assy/ water pump arbik Defender Technical Discussions 20 February 2nd, 2011 09:10 PM
Over heating issues on new 4.6 build anthony Defender Technical Discussions 7 August 1st, 2007 02:32 AM
Clutch Fan with fan 95 D90 3.9L Vadim For Sale - Parts 2 October 16th, 2004 06:19 AM
D90 -- Fan clutch and fan Vadim Wanted 3 August 1st, 2004 01:00 PM


All times are GMT -5. The time now is 01:28 PM.


Copyright