BigD383lt1

Hey I've finished my build and the pcm is tuned but I am running hot. I am running about 230° with water wetter and 50/50 water/dex. I am running the stock water pump and stock radiator. Any body else running a simular build have these issues? I live in Florida so heat is not on my side here.

96- 383 stroker motor
4 bolt splayed
Lunati crank
Oliver I beam rods
je inverted Dome pistons
comp cam 290 hr-12
comp cam promag roller rockers 1.6
AFR 210 heads
2500 stall
BBK 58mm throttle body
lt4 intake port matched
pacesetter long tube headers
off road Y-pipe
flow masters

ss.slp.ls1

iTrader: (36)

What fan settings was the pcm tuned for? Did you properly bleed the system when you filled her up? Have you verified both fans are working?

Wicked94Z

iTrader: (26)

inverted dish pistons? never heard that one before

stock water pump and radiator IN GOOD CONDITION will be fine for 99.9% of LTX builds

ss.slp.ls1

iTrader: (36)

I assume he meant domed pistons.

speed_demon24

iTrader: (6)

I get up to 200 degrees on my scanmaster in city driving with a becool radiator in the summer.

BigD383lt1

Sorry I didn't have my description exact it is inverted dome.... thanks Wicked94Z for being so noble to point that out.
http://www.jepistons.com/Catalogs/Au...ty_23_inv.aspx


Yes I have bled the system went back and double checked it several times on both bleeder screws. Both fans are working and the tuner set them at 160° and 180°... So he said.

BigD383lt1

any other ideas?

Paul Bell

iTrader: (9)

Not enough info here. Are you running the stock thermostat?

Put in the 160 degree thermo stat. Have the fans tuned to BOTH come on at 160 degrees.

I'd move to Prestone green, either the pre mix or (less money) full strength and do a 50/50 mix yourself. Use distilled water only, like 80 cents a gallon at any supermarket.

Those water wetters and such just cool off your wallet.

Park with the car inclined with the nose up. While the engine is cold, top off the radiator and half fill the overflow tank. Start engine. When the thermostat opens, the level in the radiator will drop and it'll start moving through the radiator. Top it off again. Rev the engine up a bit and hold it there, the level will suck down a bit again. Top it off again and slap on the radiator cap. Drive car. Have a beer

FASTFATBOY

iTrader: (23)

You may have an air bubble in the system, run the heater on low when you are filling to open the valve to the heater core.

Another trick is to put the front of the car up on stands when you are filling to help the air rise to the top.

Pre-fill with engine off until you get fluid out of the bleeders, shut them, top it off and crank the car with the heater on low and re-crack the bleeders one at a time to see if any air is in there. Wait till thermostat is open, top it off .

This method worked for me.

I bought a tool that pulls a vacuum on the cooling system, works good.

Paul Bell

iTrader: (9)

There is no heater valve in the heater lines. There's a flap door that directs the blower air to hot or cold.

FASTFATBOY

iTrader: (23)

Hmm, I thought it said in the service manual to turn on the heater with filling the cooling system. Maybe That was another car.

BigD383lt1

I am running a 180° and planning on getting a 160° although the tuner recommended I get a blank.

tricked94camaro

iTrader: (1)

is this at idle, city driving, or highway driving? if it is highway driving, make sure your AIR DAM is in place! i broke mine once and at highway driving, it heated to the max!

BigD383lt1

Idle it runs fine... city runs hot haven't been on the highway yet!

RamAir95TA

iTrader: (2)

Coolant flows through the heater core regardless of where the AC/heat control ***** are.

Paul Bell

iTrader: (9)

Here's a thought: Did you remove the air deflector that always rubs on parking lot stop curbs?

BigD383lt1

No deflector is still there... I may need to check to see if all the bolts are in it though I may have taken them out for something and not put them back in. Do you think it could be loose and not directing the air in the right direction???

Paul Bell

iTrader: (9)

If it's removed, you'll run hot. If it's there, even with a bolt or two missing, it's not an issue.

Just trying to cover all the bases.

Any changes in your situation?