I have a ls vtec freshly built with a half-size aluminum radiator and slim fan.

The thing is : the temp comes to 212 F when on highway after 20 minutes of driving and stays somewhere there. the fan works but doesnt seem to have much effect.

when I just had the LS with the same radiator, there was no such problem and the car never hit 200 F on highway driving.

What can be the problem ?

 

did you try replacing the thermostat? That's a pretty dangerous temperature to be cruising at...my car goes in to limp mode if it crosses somewhere around 205*

If the thermostat is ok, maybe try a quick compression test to see if your HG isn't leaking. I personally wouldn't drive it like that for long...might warp the head if it creeps up much higher.

 

is the bottom end block the same ls bottom end block you were running before?

I would think thermostat, water pump, or radiator and I would change them in that order. Make surefan is spinning the right Way with the blades

 

the bottom end is the same..
I changed the thermostat, it's the same..
my headgasket is from the Golden Eagle ls vtec kit, and there isnt a leak..

I'll try the water pump..
the fan also sucks..
is it OK if I put another fan from the front ?

 

my car tries to overheat too, 94integra. the car can idle in 72+degree weather and will fluctuate from 179-182(fan kicks on then goes back to 179) and never overheat, but if after letting it idle and get in it and drive it up the road for about 9 minutes itll reach 220 then i would have to bring it home and let it idle then the temps will drop?

 

The fan sucks, are you mocking it or does the fan pull air sucking it ?

Are you sure it's not wired backwards? Or the blades are backwards?

 

i was having an issue last year similar to yours. hre are the bunch of quick things i did to help( and it has too it was 86 outside today and my coolant stayed put on 194.

heatwrapped manifold and downpipe
propped the back of the hood up a bit with some washers to let some hot air out
drilled four 1/4" holes in the thermostat.

all have worked like a charm

 

put the stock fan back on with the shroud, if it doesnt call for a slim fan then put your stocker back on. a fan with a shroud will cool better than a 10-12 slim fan with out one.

 

Had the same problem, but not as hot as yours. Bought this fan and all my hot temps worries went away.

http://www.xenocron.com/maradyne-13-...c2d66717a90f68

 

For ls vtec do i use a ls thermostat or a gsr thermostat?

 

It is the same part number. 19301-PAA-306