normal operating tempperature for a 98 LS400
#1
normal operating tempperature for a 98 LS400
What should the normal operating temps be for a 98 LS400. On my car they fluctuate between 195-203 degrees depending on outside temp, stop-n-go traffic or whether im running A/C or not. I am measuring these temps via a OBD scan tool.
thanks
thanks
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benlex400 (01-26-22)
#2
Next time that I'm out cruising my 99 (likely Friday), I will trend my water temps via OBD and report back. This will be stop-and-go traffic in ~110F Phoenix weather. I've never paid close attention to this, but sounds interesting to see what everyone is getting.
My radiator, hoses, water pump, thermostat and coolant mixture are all about 10k miles old at this point.
My radiator, hoses, water pump, thermostat and coolant mixture are all about 10k miles old at this point.
#3
Next time that I'm out cruising my 99 (likely Friday), I will trend my water temps via OBD and report back. This will be stop-and-go traffic in ~110F Phoenix weather. I've never paid close attention to this, but sounds interesting to see what everyone is getting.
My radiator, hoses, water pump, thermostat and coolant mixture are all about 10k miles old at this point.
My radiator, hoses, water pump, thermostat and coolant mixture are all about 10k miles old at this point.
My cooling system has about 15k miles on it currently.
#6
My 98 rides dead center on line 3.it gets as high as 1/8th inch above that when motor fan is kicked in on hot days,hard use.This web pic shows just about where Im at (Just a smidgen higher) going uphill on a hot day,otherwise I ride smack on that line
Last edited by spuds; 06-28-18 at 11:44 PM. Reason: Counted line wrong,its 2 above bottom line,or line 3,same as stroock639
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#9
I ended up taking mine out Friday evening. Sun was down, but the dashboard temp was still reading 98F.
Water temp read ~189F around town, ~194F when cruising on the highway. Needle stays dead center on the middle tick always.
Water temp read ~189F around town, ~194F when cruising on the highway. Needle stays dead center on the middle tick always.
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saleenssc (07-02-18)
#10
#12
I just had this issue in my 1998 LS400. Took it to the dealer and found out that the communication box was sending overheating signals to the gauge. The car was not overheating. It didn't even ping or pop like a hot block would. I could even place my hand on the block and not get instantly scalded. They measured the temps by three methods and confirmed that car was not overheating. Diagnosis false gauge readings. So before, spending lots of cash on radiators, sensors, water pumps, and such. Make sure the gauge is reading properly. This is a common issue.
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KC98LS (07-21-18)
#13
there are two coolant temp sensors, one for the gauge and one for the ECU. make sure you replace the right one, if replacing!
the one for the ECU is the one that affects your MPGs.
https://www.clublexus.com/forums/ls-...ange-pics.html
https://www.clublexus.com/forums/ls-...read-this.html
and the temp gauge should not be right in the middle. my car's needle always rested below middle at operating temp (just like the picture above).
the one for the ECU is the one that affects your MPGs.
https://www.clublexus.com/forums/ls-...ange-pics.html
https://www.clublexus.com/forums/ls-...read-this.html
and the temp gauge should not be right in the middle. my car's needle always rested below middle at operating temp (just like the picture above).
#14
there are two coolant temp sensors, one for the gauge and one for the ECU. make sure you replace the right one, if replacing!
the one for the ECU is the one that affects your MPGs.
https://www.clublexus.com/forums/ls-...ange-pics.html
https://www.clublexus.com/forums/ls-...read-this.html
and the temp gauge should not be right in the middle. my car's needle always rested below middle at operating temp (just like the picture above).
the one for the ECU is the one that affects your MPGs.
https://www.clublexus.com/forums/ls-...ange-pics.html
https://www.clublexus.com/forums/ls-...read-this.html
and the temp gauge should not be right in the middle. my car's needle always rested below middle at operating temp (just like the picture above).