ae13291

iTrader: (8)

HI GUYS I HAV A 99 Z28 and i was changin my coolent today to the green stuff cuz i jus hate dex cool it sucks and turns into chunks of brown stuff, so i flushed out my entire system and then changed my thermostat (stock temp on thermostat) and turned on the heater to flush out the heater core too and after filling up the new coolent i ran the car and added coolent then noticed my fans came on i looked at my temp it it was over 210 degees and then it went to the second white line after to 210 and then i shut it off, can u guys help me figure out wats wrong i need my car tomarow for work, im still confused i dont think i did anything wrong thanks guys

KurtRardin

iTrader: (11)

Sounds like the thermostat is stuck. Mine did the same thing when I changed the cam, but it seems like it un-stuck itself right after I reved it up for the first time. I used dexcool though. GM might have recommended dexcool for a reason.

ShevrolayZ28

iTrader: (4)

Any problems before the swap? I mean, why change from the Dex?

But ya, remove/replace the t-stat and try it. Or maybe something else has clogged it up.

ae13291

iTrader: (8)

well dex coool! i had many problems with that, if seen many gm cars with clogged radiators because of dex cool, and dex cool also causes corosion because of all the chemicals mixed inside, after a year or two dex cool will start to turn into chunks of brown stuff in your cooling system.

ae13291

iTrader: (8)

but i really appriciate your response

ae13291

iTrader: (8)

well i had no problems b 4 just got the car so i just wanted to change it because it was pretty old but i was thinking bout stuck thermostat and i also took off the upper hose that connects to the water pump and i noticed there is like no coolent in the block so im gonna fill up the block pretty sonn im gonna go buy some more coolent first tho but ill let u know how it goes thanks

BriancWS6

iTrader: (18)

You might have air in the system.

ae13291

iTrader: (8)

should i bleed the air by keeping the rad cap half way tight

BriancWS6

iTrader: (18)

I would start the car up with the surge tank open as well as the radiator cap off. Let it run a while like that and add coolant as needed. You could also hold the rpms steady around 2-2.5k to speed up the process. There is a procedure that you can follow that I have read somewhere. But, doing like I stated above has always worked in the past for me.

ae13291

iTrader: (8)

ok thanks i will try that now ill let you know how it goes

2 fast 2000

iTrader: (4)

ae13291

iTrader: (8)

ok thanks everybody i just did it, i kept the cap open and i let it run till no air bubbles and now everything is running ok, thanks everybody

BriancWS6

iTrader: (18)

That's good to hear. I'm always glad to help a fellow LS1 owner out