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Stuck Thermostat


mywong23

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01 LS430, 107K

WP & TB changed at 90K,

****************************

on freeway, wife spotted temp guage climbing towards H...

I test drive with same symptoms, both fans spinning, radiator full of coolant.

turn on heater on HOT; to help lower coolant temp.

*************************

bought new thermostat from Lexus Concord, they even matched Toyota's price ($4 less) :)

swapped in new gasket & t-stat.

temp back to normal (halfway) :D

**************************

put old t-stat in hot water, heated to boiling.

did NOT open....

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  • 2 months later...

01 LS430, 107K

WP & TB changed at 90K,

****************************

on freeway, wife spotted temp guage climbing towards H...

I test drive with same symptoms, both fans spinning, radiator full of coolant.

turn on heater on HOT; to help lower coolant temp.

*************************

bought new thermostat from Lexus Concord, they even matched Toyota's price ($4 less) :)

swapped in new gasket & t-stat.

temp back to normal (halfway) :D

**************************

put old t-stat in hot water, heated to boiling.

did NOT open....

is this a replacement you made yourself?

i'm doing some routine maintainance on my 1993 ls400 but can't locate the thermostat.

any help would be appriciated

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I changed the thermostat on my 94LS with a cheapie simply because at the time, I had several other problems, and wanted to be sure the 'stat wasn't a problem. So I left it in, and have had no problems. I think Paris Hilton could change it out-top hose at the engine block. The only thing I can think of is that it might be installed backwards, or it's the wrong one. Best of luck.

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Good to hear that your wife has an observing eye. On a car that new- many people would never even think to look at the gauge for overheating. I do catch myself occasionally glancing at mine from time to time.

Does that car have a chime that sounds when the engine overheats, or when a warning light illuminates?

01 LS430, 107K

WP & TB changed at 90K,

****************************

on freeway, wife spotted temp guage climbing towards H...

I test drive with same symptoms, both fans spinning, radiator full of coolant.

turn on heater on HOT; to help lower coolant temp.

*************************

bought new thermostat from Lexus Concord, they even matched Toyota's price ($4 less) :)

swapped in new gasket & t-stat.

temp back to normal (halfway) :D

**************************

put old t-stat in hot water, heated to boiling.

did NOT open....

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