D90 Runs a little hotter than normal - Defender Source
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  #1  
Old March 31st, 2011, 08:27 AM
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Baird M. Gehring
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Smile D90 Runs a little hotter than normal

hey so last week I was driving my 97 D90 down the freeway softop on, ac on, it was in the 80s here in Dallas and I noticed the temp needle was just a little above/past the mid-way temp mark, it normally runs a little below the mid-way mark. I recently replaced all the hoses and coolant with water wetter along with getting a new block, it did not overheat but the needle went down after getting off the freeway and was where it normally is all the way home. This only happened to me one other time later that week and since then it's been fine but I haven't been running the a/c as much. One thing I noticed was that when the engine reached this higher temp I couldn't hear the viscous fan blowing as much as I would think. I know the couplings on those do go bad but was also wondering if I should be running a cooler thermostat for Texas weather... oh yeah don't think I've replaced my thermostat. Truck has about 70,000 mi. Do y'all have any ideas as to what might fix this minor problem? The viscous couplings I see at AB & RN are a little more pricey than I want to pay for one, if anyone has a new one they'd be willing to make a deal on that'd be great.
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  #2  
Old March 31st, 2011, 08:38 AM
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kevin
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Did you bleed the air out of the cooling system?
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  #3  
Old March 31st, 2011, 01:08 PM
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Matthew Greenspan
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Fit a better clutch. I'm assuming it'd be the same upgrade as in this thread on dweb b/c 4.0 V8. http://discoweb.org/forums/showthrea...uty+fan+clutch

You could also replace the fan with an electric one which would be my recomendation.
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  #4  
Old March 31st, 2011, 01:12 PM
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Or Pendy's blade:

http://www.defendersource.com/forum/...ad.php?t=26331
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  #5  
Old March 31st, 2011, 01:48 PM
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Matthew Greenspan
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He didn't want to pay the AB price for a fan clutch. I doubt he wants to pay $250 for "Pendy's blade".
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Old March 31st, 2011, 04:26 PM
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Before you assume it is running hot, you should check the temperature of the top tank of the radiator with an IR thermometer, or even just a kitchen thermometer in the overflow tank. Landy temp gauges are not renowned for accuracy.

If you swapped the block, did the coolant temp sensor get removed/replaced? Did it possibly get installed with silisnot or something on the threads that could affect the sensor's ground?
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  #7  
Old March 31st, 2011, 05:57 PM
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joe heins
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I would check the temp with the IR sensor, like Tony says, if it is running a little hot, in my experience it can definitley be the fan clutch. My d-90 started running "a little" warmer during highway runs, the fan clutch appeared to be normal but finally went out altogether. After replacing the fan clutch with one from AB the temp gauge is steady, highway or stop and go.
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  #8  
Old March 31st, 2011, 07:52 PM
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Charles Galpin
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Baird if you want to go cheap I can dig up the part number for a $60 one from advance auto. You have to get some M10x1.5 15mm bolts and drill out the holes in your fan to accommodate them, but otherwise it's a direct fit.
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  #9  
Old April 2nd, 2011, 04:04 PM
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Baird M. Gehring
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well I inspected my fan clutch today (whilst replacing the alternator) and it looks like there may be a tiny seepage of oil coming from the center of the clutch. The clutch appears to be damp around the middle and dry on the outside. I was told that this means the clutch is going out, but whatever oil is being leaked out is such a small amount that it's dry, doesn't feel wet or oily to the touch. I'll post a pic, maybe one of y'all could tell me if this looks indicative of a dying fan clutch. Not to familiar with fan clutches.... this is my only Rover so not sure if this is normal or if it means I need to get a new clutch.
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  #10  
Old April 2nd, 2011, 04:19 PM
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That spring on all the clutches ive ever bought had greese on them. I am sure that is remants, not to mention how nasty RV8's get over time. You would do yourself well to look on the Discoweb for the GM HD clutch, I put one on a serp range rover. I would advise if youve got some mileage on your truck to replace the fan, they are prone to shattering. The stock D90 fan is worthless.
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  #11  
Old April 2nd, 2011, 04:25 PM
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Baird M. Gehring
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yeah I already put a new land rover fan on, found that the blades on my old one broke off too easily
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  #12  
Old April 2nd, 2011, 11:51 PM
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jim pendleton
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Be a good idea to at least have your radiator rodded and cleaned. This can often be done for less then 100. The small passages of the radiator core LR used clog very easy and the radiator shop can clean them to bring back the radiator cooling.

You will more then likely find the exterior of the core clogged up as well upoun removal.
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  #13  
Old April 2nd, 2011, 11:54 PM
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Baird M. Gehring
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today I fitted a new 180 degree thermostat to help it keep cool, don't really need the extra 10 degrees here in Dallas, hopefully this will do the trick.
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