Yet Another overheating thread - Defender Source
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  #1  
Old August 7th, 2010, 03:08 AM
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Defender90_218
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Trenton Smith
1997 D90
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Yet Another overheating thread

Has anyone experienced overheating at highway speeds that returns to normal by slowing to city speeds/sitting. It seems backward from most of the other overheating threads I can find.

Heres what I've done so far to no avail.

Rad. Flush
New hoses
New water pump
New thermostat

Thanks
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  #2  
Old August 7th, 2010, 08:04 AM
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draaronr
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Here
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your radiator is crap.
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  #3  
Old August 7th, 2010, 04:42 PM
jhhorse
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joe heins
1995 defender 90
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I would say check your sender and gauge, make sure they are working properly. My D-90 runs hotter at highway speeds, or when climbing a long hill, etc, The gauge looks like it is getting ready to overheat, but after checking the actual temp of the engine, hottest it gets is about 210 degrees F, I think this is fairly normal temp and my gauge just reads high. I have checked the rad, no hot spots, coolant comong out of rad is about 35 degrees cooler than going in.
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  #4  
Old August 7th, 2010, 06:25 PM
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Trenton Smith
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It's actually over heating, its boiled over a couple of times when I couldn't stop in time
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  #5  
Old August 7th, 2010, 07:40 PM
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kevin
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When my truck did this it turned out to be a radiator cap with a bad gasket. New cap cured everything.
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  #6  
Old August 9th, 2010, 09:24 PM
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Chris Davis
94 NAS D90 6.2LS
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Could be the cap, clogged radiator, stuck thermostat, head gaskets, porous block, slipped cylinder. You can rule out the last three with a block tester (about $60 from Napa). Personally, I would start by checking the cap, then thermostat then the block test. From there, I would pull the radiator and have it checked out (or get an IR thermometer and check it yourself) and/or get the fluid block test from NAPA and check that. The most expensive part of this procedure is the radiator check mainly due to the time/inconvenience of pulling the radiator which is not hard, just not fun.
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