I'm working on a 99 si with a gsr motor
pretty much stock,besides intake ,header..

The car ran fine for about 4 months,from the day
it got the gsr motor,it runs on a gsr computer by the way..

so,car idles fine drives around town fine,untill its starts to
go uphills for longer than a minute then it start to move needle
in the gauge to 3/4 of the way...a 1/4 away from the redzone.

we changed,thermostat,coolant ,flushed radiator,checked fan comes on,
checked head and block surface, changed headgasket, put fresh coolant
bleed the system and still does the same thing it didnt get better or worst..

again only going up hills,fan comes on when driving.
i pulled over when needle starts to move and it was on.
any advice or recomendations you guys have is welcomed....

 

anyone think of something i overlooked?

 

Do you think your engine is overheating? Or from what your eyes see where the temp. needle is, and you think you're overheating? If you already did the fluid changed and parts mentioned above, then it shouldn't overheat! Did you changed your temp. sensor? Mine did the same thing and I did the same thing as you did, but I didn't changed my temp. sensor. After all that, the temp. needle stays below the half-way mark.

 

bad water pump?

 

no havent changed sensor,but will try...

 

wouldnt the pump leak?it runs of the timing belt,
so its always rotating right?

 

it would but sometimes it could just start to go bad...check for any leaks...

 

head not sealing ?

 

okay figuered it out..
alumi radiator expanded
due to rad cap...
cheap knock off radiator,due to rad cap...

hopefully it will help someone down the road.

 

THATS SOME CRAZY SHYT...good thing u figured it out...

 

im not sure what you mean

 

i was gonna say check your radiator cap!!