Red97Formula

iTrader: (1)

I have had cooling issues with a lt1 for the past month off and on, it runs good for a week after i replace one thing, next week its running hot again. Ive replaced the water pump, radiator, all the hoses, bled the radiator a few times. After about a week of running good today it took a **** on me again.. The coolant is leaking from the reservoir. I replaced the cracked reservoir about two weeks ago. i am honestly looking for a shop in the pasadena / deer park area that could figure out the problem for me so i can get this over with.

TWS

iTrader: (63)

Have you taken a hose and sprayed (moderately) high pressure water all up and down the fins? Many LT1's have seen so much use that the spaces between the fins might be gunked up.

tmichelli

iTrader: (1)

let me take a look at it ill figure it out in 2 seconds. PM me

slow96z

iTrader: (12)

I didn't see a t-stat in the list of things you replaced. That is likely the issue. make sure you get an LT1 specific replacement, not just SBC. Take yours in with you if it's original for comparison. If you have bled the system right (not bagging on you, but most likely you have not) and still are having issues that's the first place I would start. Takes about 10 minutes and less than $20 to check. I'd do that before I took it to a shop.

Fun-Formula98

iTrader: (3)

I had a 94 z28 that had similar problems... I replaced **** like crazy... Nothing worked... UNTIL i bled the system. I bet that's going to be the issue.
PM me. Im in Pasadena.

Cowboy97

iTrader: (3)

Yeah i'm with slow96 change the thermostat and make sure to bleed the system. Also check your fans and the wires going to them maybe a wire is loose or a motor is out.

the man

iTrader: (3)

not to steal your thread but a buddy of mine has hade the same issue and we've literally replaced everything...i have no freakin clue what to do...so im taking it to a shop

gcodetx

iTrader: (2)

cheapo get on the ball!!! we need to bleed your system it looks like... and i dont think youve done that yet, or have you?

Red97Formula

iTrader: (1)

Thanks for the input guys. I just bought the 160 t-stat and will be putting that in. Also the whole bleeding situation, ive been having it done by a mechanic so i figured he would be doing it right but who knows .. checked it out today again and it seems to be losing coolant from somewhere and i think its a small hose leak because i very very slowly lose coolant and then it eventually over heats from the lack of enough coolant, im not a mechanic or anything though. hoping to replace ALL the hoses this weekend and hopefully figuring out the problem. then of course bleeding it. any more input that you guys think would help would be apreciated.

gcodetx

iTrader: (2)

put an ls1 in it

GreatWhiteZ28

iTrader: (15)

I'm Whilling to bet it wasn't bled properly, my 95 started over heating like crazy last summer and I thought I had bled it properly since I had done it a million times before, after replaceing the water pump and t-stat....

Nasty99TA

iTrader: (1)

Port and polish your water pump

gcodetx

iTrader: (2)

And then get the attena delete mod!

FIREHAWK #07

iTrader: (1)

Waterpump went out on me last year... I changed it out along with t-stat... worked fine for a day, got hot again the next day. I bled it and still didnt work,,, ended up being the radiator cap.... im serious.

BizZzatch350

iTrader: (33)

Happens, my LT1 had a coolant leak before I did H/C, could smell it but was dripping on some thing hot so you could never really find it. When I did the heads and cam, we replaced every single hose in the engine bay along with the radiator. I'm pretty sure it ended up being the heater hoses that go in to the heater core.

ex-SS-ve

iTrader: (9)

nah its impossible. will not work!!! lol then again what do i know about ls1 swaps?

got that too. 20 rwhp&10+mph in the 1/4

another possibilty is the steam tube connected to the backside of the heads. the rubber gaskets usually dry out and seep out the coolant slowly. not the easiest location to get to however not impossible.

Steel185

iTrader: (2)

I've ran across that situation also, it sounds too easy, but if the cap is worn then it won't hold the correct amount of pressure, causing heating issues. We switched the motor on my sister's Camaro, completely rebuilt new everything, pump, radiator, hoses...working on the heat issue looking around i noticed the cap was older looking than the rest, and realized we re-used it cause the new radiator didn't ship with one, $6 later, no problems for 9 months...then she wrecked it. so i guess still no heat issues...

Red97Formula

iTrader: (1)

yeah thats what i was hoping the problem was about a monthh ago, replaced the cap, still overheating. lol seems like the only thing i have not replaced is the all the hoses and?... whatever ex-ss-ve said.. lol hoping the replace all the hoses today and bleed it out then go from there

that_guy_02SS

i got the same damn problem on my 94 z28. how in the hell do you "bleed" it properly?

slow96z

iTrader: (12)

the way I do it is:

take off the cap and make usre it's full
open both bleeder valves
start the car
wait until thermostat opens and coolant level drops, fill again
watch bleeder screws for stream on water

If it burps any bubbles or air pockets then wait and let it go. Water is cheap! It will **** out a constant stream from both bleeders when there is no air left in the system.