engine runs hot in low range - Defender Source
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  #1  
Old January 14th, 2007, 10:21 PM
andyrad
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Andy Radlgruber
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engine runs hot in low range

Is this normal? When crawling down the trails in low range the engine gets much hotter than normal. As soon as I put it back in high and speed up a little, say to 20 mph, it cools off. Is there a connection between the tcase and cooling system that I don't know about? My last 4x4 was a '90 Ford Ranger with the skinniest rad I've ever seen and the temp gauge never moved off the cooler side. I hope this does not cause a problem.
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  #2  
Old January 14th, 2007, 10:33 PM
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Tim Scully
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It shouldnt get hotter in low range. Have you changed the thermostat recently? You don't have as much air flow when you are offroading and you are also putting more of a load on the engine. Hopefully it is something simple like the thermostat!!! What are you driving now???
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Old January 14th, 2007, 10:45 PM
andyrad
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I did replace the thermostat last winter due to a severe lack of heat. Big improvement to get heat but in the summer when wheeling it gets what I feel to be a little too hot. I'm still driving the D-90 unless it's -10 celcius of lower, then I drive the 02 VW GTI 337. I would like to look into this possible overheating a bit further before May. I do a long wheeling weekend in Quesnel with the North Caribou Offroad Adventurers Society. Plenty o mud up there.
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  #4  
Old January 14th, 2007, 11:18 PM
MonLand
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Loic Fabro
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Quote:
Originally Posted by andyrad
I did replace the thermostat last winter due to a severe lack of heat. Big improvement to get heat but in the summer when wheeling it gets what I feel to be a little too hot. I'm still driving the D-90 unless it's -10 celcius of lower, then I drive the 02 VW GTI 337. I would like to look into this possible overheating a bit further before May. I do a long wheeling weekend in Quesnel with the North Caribou Offroad Adventurers Society. Plenty o mud up there.
How is your fan clutch? Make sure it is working 100% fine.
Did you flush your cooling system recently? build-up means bad coolant flow and driving a little faster might also mean more revvs to the engine (i.e. increased flow). Is your radiator clean, you mention mud, make sure air can get through _all_ the radiator.
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  #5  
Old January 15th, 2007, 01:45 AM
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I had this problem but my buddy convinced me that it was being caused by my driving style. Try to keep your RPMs low unless you're crawling up something. Low speed + high RPM will inevitably get your truck hot.
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  #6  
Old January 24th, 2010, 09:03 PM
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john
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I had this problem yesterday going up some steep grades. Anyone else experience this and have a solution? It was cold on the mountains yesterday but Im concerned if it was summer I would of overheated for sure. I would stall or slip backwards if the RPMs were too low so not much I could do about the driving style.
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  #7  
Old January 24th, 2010, 10:06 PM
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Wow, flashback.

I eventually ended up replacing my head gasket and haven't had a problem since.
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  #8  
Old January 24th, 2010, 11:14 PM
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Charles Galpin
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I believe the correlation is with added load and slow speed (insufficient airflow through the radiator) which is likely the fan clutch. But if that's good then check the radiator, then worse - something like head gaskets. Check you fan clutch first.
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