200tdi runnin' a little hot - Defender Source
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  #1  
Old June 22nd, 2012, 12:25 PM
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Mike Deery
1984 D-90
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200tdi runnin' a little hot

I am looking to bring down the temp of my defender in hot weather. The other day it was 98 degrees and the temp guage went up to the orange (hot) zone of the guage, but did not go into the zone and it did not overheat. My car runs cold in the winter, in the middle zone in moderate temperatures (50 degrees - 80 degrees) and hot when the temperatures go over 90 or so. I don't want to re - engineer the whole cooling system. Looking for some hopefully simple suggestions. I was thinking of replacing the viscous clutch fan with a fan from Pendy that bolts onto the flywheel. Also thinking of adding air scoops to the fenders to get more air in the engine area. Any other ideas on bringing the temp down? I was thinking of seeing if a thermostat is in the truck and removing it for the summer if there is one present. Any other ideas or help would be appreciated.
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  #2  
Old June 22nd, 2012, 12:39 PM
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Jay S
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have you had your radiator looked at? I had mine cleaned as some of cooling was reduced as parts were clogged - once serviced it does not go above 1/2 on the gauge anymore
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Old June 22nd, 2012, 12:41 PM
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John B.
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First, your thermostat is not good by your description. Replace it. Do NOT remove it!!!

Second, do you know if the viscous unit is working? When hot, pull over, pop the hood and try to stop the fan carefully with a rolled up newspaper. If you can stop it, it needs replacing.

There is no need to modify the stock design at all.
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  #4  
Old June 22nd, 2012, 12:44 PM
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Keith Armstrong
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^^ what he said....oh, and keep the damned fan away from your flywheel!
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Old June 22nd, 2012, 12:45 PM
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steve
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are you sure it is holding pressure?
Check all hose connections as well as the seam around the coolant reservoir. A slight crack can cause cooling issues.
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  #6  
Old June 22nd, 2012, 12:52 PM
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Michael White
110 Tdi
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Make sure nothing is blocking your radiator air flow. The previous owner mounted lights right in front of the radiator - removing them dropped the running temperature by 10 degrees during a 95 degree day, about to the thermostat opening temperature.
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Old June 22nd, 2012, 07:58 PM
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Mike
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do you have the fan cowl? I have heard of some that did not have a fan cowl and by adding one they decreased the engine temp.
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  #8  
Old June 24th, 2012, 07:13 PM
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Mike Deery
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OK, I've decided to replace the thermostat and to take the radiator to a local radiator shop to be cleaned out and checked. There are no leaks or cracks in the cooling system, but there could be some obstructions in the old system. I will let you guys know how it works out, and thanks for the advice.
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