i got a 99 teg. it is a LS. recently when i am driving, i saw my temp gauge needle drop down to almost the beginning. then i found out when i put my running and sitting there. the temp will go to normal. but when i drive on the freeway and past 80 mph. the temp drops. and when it drops, i have to pull over 3500 rpm to reach 80. when it is on normal temp. it just need around 3200 rpm to reach 80. what's wrong? anyone knows?

 

I don't know what you mean by you need 3200 to reach 80...but your thermostat is stuck open - therefore, overcooling the motor.

 

will that damage my engine? do i need to replace the thermostat right away?

 

short-term...its fine. however, eventually the coolant will become heatsoaked and start doing damage.

do not wait any longer than 2 weeks.

 

it has been always a year that i had this cooling problem. my teg has only 47k. is my thermostat really stuck open?

 

if it is that low, then yes, GO TO A MECHANIC !!!

 

i did it myself...i can post a how-to that i created?

 

many people have the same problem with the temp guage... even on my car its not always in the middle... my buddy's RS is like a qurter up when the car has been running all day... go figure.. I heard its a common thing for integras, is that true ???

 

Well, even with the new thermostat, my temp gauge will sit maybe 6mm from the middle. But that is where it should be.