Is 210* to hot? - Defender Source
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  #1  
Old September 7th, 2008, 03:11 PM
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Gary Young
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Is 210* to hot?

My D90 is running at almost 210* when the ambient temperature gets into the 90's and above. Is that to hot or is it in the normal range? Normally on a 70-80 day it stays around 185-190.
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  #2  
Old September 7th, 2008, 03:17 PM
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Quote:
Originally Posted by PCRover
My D90 is running at almost 210* when the ambient temperature gets into the 90's and above. Is that to hot or is it in the normal range? Normally on a 70-80 day it stays around 185-190.
I'll put money on it your fan clutch is done. My trail rig does the some thing when I drive it around town, and the fan clutch on it is dead.
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  #3  
Old September 7th, 2008, 04:54 PM
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Gary Young
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That is what I thought also so I just put a new one on it and no change. Also installed a new radiator. It runs at those temps either at highway speeds or around town, but only when it is real hot out.

I guess my real question is how hot can you these engines run and not damage them?

Quote:
Originally Posted by madcowdungbeetle
I'll put money on it your fan clutch is done. My trail rig does the some thing when I drive it around town, and the fan clutch on it is dead.
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  #4  
Old September 7th, 2008, 05:04 PM
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Gary, have you changed your temperature sensor yet? If not, have you changed the gauge?
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  #5  
Old September 7th, 2008, 06:02 PM
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How hot is too hot? I know the 5.3 in the GMC sierra its temp gauge sits around 210.
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  #6  
Old September 7th, 2008, 07:36 PM
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Gary Young
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Yep, That is how I know what the temp really is vs the stock C-H gauge. Autometer gauge with new sensor to match.

Quote:
Originally Posted by DJ Menasco
Gary, have you changed your temperature sensor yet? If not, have you changed the gauge?
Follow-up Post:

That is my question. Is 210 to hot? Sure I know in a perfect world 190 all the time would be desired, but when it is 105 outside is 210 to hot for the 3.9l?


Quote:
Originally Posted by rover4x4
How hot is too hot? I know the 5.3 in the GMC sierra its temp gauge sits around 210.
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  #7  
Old September 7th, 2008, 07:43 PM
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I just had my Thermostat go out on my ST... I just took it out completely. Gary, I would try the same thing and see if anything changes.
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Old September 7th, 2008, 10:18 PM
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Gary Young
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Guess that wouldn't hurt. It seems to work as I can watch the radiator water through the fill hole and it is calm until 180 or so then it starts to flow. But it could be not opening all the way I guess.

Quote:
Originally Posted by woldd90
I just had my Thermostat go out on my ST... I just took it out completely. Gary, I would try the same thing and see if anything changes.
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  #9  
Old September 8th, 2008, 08:46 AM
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Spray out the fins on your radiator. I was having similar problems and sprayed out my radiator (I thought I had done it sufficiently after my last wheeling) and was amazed at the amount of dirt and crap that came out.

As a stop gap, I have found that kicking the AC on at a stop light to turn on the electric fans can keep the temp from climbing if your viscous fan is shot. I replaced mine and now the truck is running at 190 when it is over 90 outside and I don't need to use the AC fans any more.
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  #10  
Old September 8th, 2008, 04:17 PM
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210 won't hurt the engine, but it is in the range where you would think something is a miss in the cooling system. When everything is properly working, these things do not get warm on their own.

Ron

PS OTOH the lotus will run up to 205-210 anytime you sit in traffic and that is supposedly "normal." I turn on the heat as soon as I hit 200.
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  #11  
Old September 8th, 2008, 05:21 PM
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Quote:
Originally Posted by woldd90
I just had my Thermostat go out on my ST... I just took it out completely. Gary, I would try the same thing and see if anything changes.
Have you noticed an improvement since removing your T-Stat?
I don't know if it is an urban legend or not, but I have always heard you should not remove the thermostat entirely, because the coolant circulates too quickly and does not cool as efficiently.

Gary: I replaced the blocked driver side wing grille with a RHD vented heater intake grille (from George) to help vent some of the hot under hood air out.
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  #12  
Old September 8th, 2008, 08:08 PM
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Gary Young
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The 210 temp happens at freeway speeds along with around town which makes me wonder what is going on. There should be plenty of air at 65mph even if it is 105 to start....

Maybe I will pull my temp sensor and check it for accuracy in some boiling water.
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  #13  
Old September 8th, 2008, 08:35 PM
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Have you tried a infrared laser thermometer? they work very well to see if gauge is accurate.
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  #14  
Old September 8th, 2008, 09:25 PM
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240 to 250 before you have to worry about damage. My new vette consistantly runs over 200 in design.
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  #15  
Old September 8th, 2008, 09:57 PM
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I wonder if all those BB"S my son poured into the radiator just before you bought the truck might have something to do with the 210 temp? Do the boil test Gary or just get another stat since you would have to reinstall the old one anyway. Cheap enough test at least.
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  #16  
Old September 8th, 2008, 10:31 PM
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Gary Young
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How did forget about this! I have one and will check it.

Quote:
Originally Posted by SOUTHPAW26
Have you tried a infrared laser thermometer? they work very well to see if gauge is accurate.
Follow-up Post:

Thanks Shane, that is what I was thinking but just wasn't sure the Rover engines could take 210 all day on the trail.

Quote:
Originally Posted by huck1974
240 to 250 before you have to worry about damage. My new vette consistantly runs over 200 in design.
Follow-up Post:

HaHa Mike, I found those when I had the radiator recored. I thought is was just some factory debris....

Quote:
Originally Posted by mpsteil
I wonder if all those BB"S my son poured into the radiator just before you bought the truck might have something to do with the 210 temp? Do the boil test Gary or just get another stat since you would have to reinstall the old one anyway. Cheap enough test at least.
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  #17  
Old September 8th, 2008, 11:47 PM
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Its to hot.
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