chevy 350 getting to hot

[GnArKiLl]

Well my 86 3/4 ton 350sb has been running pretty warm since i got it.. So i replaced the waterpump, tryed another radiator,bypassed the heatercore(might be blocking coolent flow?) changed the thermostat from a 195 deg to a 160 deg.. And with the 160 it runs realy cool for a while but still gets warm after a bit of driving about to 230 deg.. Also when i come up to a stop light and the temp is at say, 215 deg it cools right down to about 190.. But when i take off its right back up to 215-220 befor im across the street.. I do have an aftermarket temp gauge along side my stocker to see if the stock gauge was just messed up... So iv done about everything i can think of... OH and there is no coolent in the oil or anything

[Parker]

... cooling fan

[GnArKiLl]

i have the stock metal fan

[zbrown]

when it is hot are the radiator hoses + rad super hot or not??

if i the whole system isn't getting that hot it could be air in the heads or T-stat, but you said you covered that

[GnArKiLl]

oh yea you cant leave your hand on the radiator hose.

[zbrown]

does it run well? there isn't any crazy timming or something going on??

[GnArKiLl]

no it runs realy well.. has a stumble here and there but that a carb for ya

[zbrown]

Id pull the thermostat and see what it did..... if the whole system overheats still i would have to think it is a rad problem..

and you are not pushing any air into the coolant?? and not loosing any coolant?

[GnArKiLl]

no im not losing any coolent

[weshole]

It sounds like the fan clutch is slipping to me.

[GnArKiLl]

ok ill switch fans.. i have a few sitting around.. but what one do you think is better the 6 blade or the 3 blade? the 3 blade looks like the blades have more of a scoup to them..

[weshole]

are they solid mounts or do they have a clutch they mount to?

Like this.http://www.haydenauto.com/products/fan-clutches-and-fan-blades.htm

[GnArKiLl]

they have a clutch... but i did change fans and it still gets hot

[94civicex]

check the timing and look for a vaccume leak. thats what was happining with my camaro a couple years ago and it was because the timing was advanced and it had a small vaccume leak, it ran fine too.

[GnArKiLl]

the timing is dead on..

[Bookem]

What kind of shroud is around the fan? Make sure you have the right fan, s-10 fans and water pumps will bolt right up but have opposite rotation. Also make sure there's no restriction in the exhaust.

[Parker]

it still sounds like a bad cooling fan clutch....

[generation_xxx]

id chech the fan clutch, also fan shroud and is it getting the air flow directed thru the core properly

[zbrown]

traveling at speed down the highway the fan should be irrelevant

there should be way more than adequate airflow across the rad. even if the fan was taken off, when traveling down the highway

[GnArKiLl]

its not the fan thats for sure.. i tryed 2 other fans and i know both of thase work because i pulled them off running trucks.. i think the radiator might be cloged, so ill see what i can come up with