Heating issue at idle - Defender Source
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  #1  
Old April 6th, 2015, 12:34 PM
jperakis
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James Perakis
94 ST
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Heating issue at idle

All,

After a near decade long hiatus, I'm back in a 1994 NAS defender (#334).

The truck is in great condition overall and just performed admirably on the 500 mile trek from Southern California to its new home in the SF bay Area.

I do have one concern that I would like some help with.

At idle and after the truck has been on for 20+ minutes the engine will start to get hot.

It never gets to redline (always several mm shy), but it certainly is not happy with no air going through the radiator.

At any kind of speed the engine quickly cools back down.

I have an auxiliary electrical fan, but it does little to mitigate the temperature increase.

My guess is that the radiator either needs a flush or needs replacement.

The stock fan and electrical fans both work well and again at speed there is no issue.

All of this leads me to believe (perhaps wishfully) that it is not a header issue and that the problem is rooted in the radiator.

Any comments, questions or otherwise would be greatly appreciate.

I can't wait to get this issue sorted out so I can take it on the trail where it belongs.

Thanks all.
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  #2  
Old April 6th, 2015, 12:44 PM
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Russell
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Did it consume any coolant after your trip? If so, it could be the head gaskets.
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  #3  
Old April 6th, 2015, 01:31 PM
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did you check your coolant level?
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  #4  
Old April 6th, 2015, 01:38 PM
jperakis
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James Perakis
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Quote:
Originally Posted by sonoronos View Post
did you check your coolant level?
I'll check it as soon as I get home.

Also, after spending a few minutes on the phone with both West Coast British, it sounds like there is a wide range of possible causes for the heating problem.

Could be head gaskets, could be fan clutch, could be radiator...

All in all it's something I need to fix ASAP.

Is it crazy that I miss these kinds of issues in a car?
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Old April 6th, 2015, 01:55 PM
jperakis
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James Perakis
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Quote:
Originally Posted by down_shift View Post
Did it consume any coolant after your trip? If so, it could be the head gaskets.
As I just replied to another post, I'll check this when i get home.

I really appreciate the feedback!
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  #6  
Old April 6th, 2015, 02:00 PM
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Jason England
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Feel the bottom of the rad and see if it's lower temp than the top ... that would indicate blockage ...

You can also get a good idea of head gasket leakage by comparing all the spark plugs .... in a leaky cylinder they would be a lot cleaner by comparison.

The other thing is are your hoses pressurizing? They should be firm ... if they aren't then the system doesn't cool properly. A replacement radiator cap is only a few dollars.
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Old April 6th, 2015, 02:06 PM
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Chris
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Familiar with this problem as it affects my truck too. Even with a new radiator etc. Its not like its getting really hot, but the needle nudges up a little. Yup. Its another reason to dig into the truck. Haven't yet fully debugged it....
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Old April 6th, 2015, 02:33 PM
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Fan clutch to start...
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Old April 6th, 2015, 02:55 PM
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I'm officially mad with fan clutches. One day come the revolution I will buy that purdy Allisport radiator with electric fans.....
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Old April 6th, 2015, 03:18 PM
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Quote:
Originally Posted by Brewie212 View Post
Fan clutch to start...
So to test the fan clutch open the hood and when the temp is moving up try and stop the fan with a rolled up newspaper ... you should also here the difference in noise when the fan clutch engages.

If it is the fan clutch ... don't buy a heavy duty one ... they just suck gas and make more noise for zero benefit.
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