I have a low mileage '99 LS400; just passed 60K miles. I will be doing the 60K mile maintenance this weekend, including cooling flush and fill. I couldn't find anything in the Lexus recommended maintenance regarding the thermostat. Is there a recommended mileage/age interval to do so?
Recommended Interval For Tstat Replacement?
Started by AZ Mike, Jun 09 2008 10:24 AM
5 replies to this topic
#1
AZ Mike
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Model: 1999 LS400
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Posted 09 June 2008 - 10:24 AM
#2
wwest
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Model: 1992 LS400, 2001 RX300, 2001 911 C4
Posted 09 June 2008 - 12:23 PM
I have a low mileage '99 LS400; just passed 60K miles. I will be doing the 60K mile maintenance this weekend, including cooling flush and fill. I couldn't find anything in the Lexus recommended maintenance regarding the thermostat. Is there a recommended mileage/age interval to do so?
No.
Engine cooling control thermostats are reliable enough that most cars arrive at the wrecking yard with the factory originals.
But I suppose that you might as well if you get to 250,000 miles and want to finally change the original timing belt and maybe even the water pump.
#3
SW03ES
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Posted 09 June 2008 - 03:30 PM
Agreed, no reason to replace the thermostat.
#4
chilkoot
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Model: 1993 LS 400
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Posted 10 June 2008 - 02:25 AM
if it makes you feel any better, the 1st gen thermostats fail open, so if it does go south the temp gauge sticks at the second needle and not the red one.
I can only assume that a '99 would be the same.
I can only assume that a '99 would be the same.
#5
1990LS400
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Model: LS400
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Posted 10 June 2008 - 05:39 AM
All thermotstats are in the open position when they fail -- that's just how they work. That's why the first sign of thermostat failure is usually the lack of heat from the heater.if it makes you feel any better, the 1st gen thermostats fail open, so if it does go south the temp gauge sticks at the second needle and not the red one.
I can only assume that a '99 would be the same.
#6
eatingupblacktop
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Model: All stock all original 91 ls400
Posted 11 June 2008 - 10:21 PM
I would replace the stat with every timing belt service.
