Generation III Internal Engine 1997-2006 LS1 | LS6
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UPDATED :) Temp won't come down no matter what

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Old 04-23-2011, 12:52 AM
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Nope shes a 66 Thanks for compliment

That big bulky seat is gone now replaced with some 2002 Ebony Trans Am seats

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Last edited by shoebox66; 04-23-2011 at 12:58 AM.
Old 04-23-2011, 11:02 AM
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awesome car man the 66 & 67 are my all time favorite car, i would love to one day build one
Old 04-23-2011, 11:08 AM
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Thanks I love the LS1 technology in these older cars. I thought my 93 Formula was mean with LT1 but these LS1 are the ticket.
Old 04-23-2011, 11:09 AM
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Originally Posted by S10xGN
Nice ride! Your system is similar to mine in that the radiator cap is the highest point. I have no trouble with mine and did nothing "special" to bleed air. I also have an A/C condenser and a huge B&M trans cooler in fornt of the radiator. That bottom hose being cold has got to mean something. I'd try running it with the t'stat out just to rule it out for sure. Maybe something is binding it up when it's in the neck...
i did not see this before
+1 on this i would definitely suspect the t'stat as well, is a factory one? i know i had a stant 180* that gave me very similar problems, i pull out the insides and they went in the trash
Old 04-23-2011, 11:12 AM
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Originally Posted by tripblackls1
i did not see this before
+1 on this i would definitely suspect the t'stat as well, is a factory one? i know i had a stant 180* that gave me very similar problems, i pull out the insides and they went in the trash
No I changed it to a Hypertech Hyperstat 160. Is there a btter one you know of? I'm still thinking about changing it even though tested on stove and opened correctly.
Old 04-23-2011, 11:18 AM
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i would not buy another one just yet, if you have the a old one i would pull the guts out of it and run it without one and see what happens or if you have a stock one i would throw that on there as i trust gm t'stat much more than anything else
Old 04-23-2011, 11:20 AM
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Originally Posted by tripblackls1
i would not buy another one just yet, if you have the a old one i would pull the guts out of it and run it without one and see what happens or if you have a stock one i would throw that on there as i trust gm t'stat much more than anything else
So you saying go back to 180 and forget 160? Does computer need to be updated again with t- stat change?
Old 04-23-2011, 11:27 AM
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the only thing the comp does is command when to turn the fans on so they will turn on early but that is not going to hurt anything,
idk i would try to run it without a stat at all, but dont want you ruining a good stat by taking it out of the housing
i can pretty much guarantee that the gm stat will work right though
Old 04-23-2011, 12:13 PM
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Originally Posted by tripblackls1
the only thing the comp does is command when to turn the fans on so they will turn on early but that is not going to hurt anything,
idk i would try to run it without a stat at all, but dont want you ruining a good stat by taking it out of the housing
i can pretty much guarantee that the gm stat will work right though
I will give this a shot.
Old 04-23-2011, 12:38 PM
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do you have LS6 coolant tubes or the LS1s on the intake?
Old 04-23-2011, 12:40 PM
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Originally Posted by sjsingle1
do you have LS6 coolant tubes or the LS1s on the intake?
This is LS6 intake, I'm not sure.
Old 04-25-2011, 05:23 PM
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did you ever get this worked out?
Old 04-25-2011, 05:29 PM
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Originally Posted by tripblackls1
did you ever get this worked out?
Not totally. It runs cool at idle soon as air conditioning is on temp starts to rise. This is sitting idling with air on going down road cool as cucumber.

I took off belt and spun water pump pulley, it makes a buzzing sound almost like a bee. When I rev engine up temp comes down, I am now thinking water pump is not pumping enough water and about to fail. It has a ATI pulley which slows down so its even worse probably if water pump is not pumping enough. Do you think Edelbrock would be good choice?
Old 04-25-2011, 07:18 PM
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LS1 coolant tubes under the intake would look like a big S shaped snake......LS6 tubes would just be in the front and blocks in the back.......if those tubes are not flowing coolant........things could get hot
Old 04-25-2011, 07:23 PM
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Are your heater hoses blocked off? I know some vintage air kits include a shut off valve. If so try allowing the coolant to flow through the shutoff valve by turning the heater on or bypassing the heater by looping the heater hoses together.

Since the thermostat is located on the inlet to the engine the heater hoses must be circulating or the thermostat will open late. Give it a try and report back.

Last edited by -Joseph-; 04-26-2011 at 12:27 AM.
Old 04-25-2011, 11:57 PM
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I had a heating problem with an Under-drive crank pulley system. I put the Stock pulley back on and worked perfect. No overheating.
Old 04-26-2011, 01:58 AM
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Certainly not on an engine with 10k miles but I've seen these exact same symptoms on a car I owned in Japan. Was a 93 mitsu GTO (3000GT VR4 here) and the issue was that the bearing had gone out in the water pump (powered by timing belt.....just dumb). This would cause coolant loss over time and it would squeal once in a while. You never saw any coolant leaking at is evaporated before it could collect. Revving it would cause cavitation but it would still flow more and cool down.
Old 04-26-2011, 10:23 AM
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Originally Posted by Exidous
Certainly not on an engine with 10k miles but I've seen these exact same symptoms on a car I owned in Japan. Was a 93 mitsu GTO (3000GT VR4 here) and the issue was that the bearing had gone out in the water pump (powered by timing belt.....just dumb). This would cause coolant loss over time and it would squeal once in a while. You never saw any coolant leaking at is evaporated before it could collect. Revving it would cause cavitation but it would still flow more and cool down.
I'm leaning more on this water pump now as your description sounds familiar. I just found out piece of **** Aluminum radiator bought from a repop dealer for Nova parts is leaking both sides at bottom.

So I'm fixing to fix that issue buying this radiator below no frigging epoxy anywhere. I noticed on my radiator at neck they did not even weld around the where it seems to tank. It leaks there to They even had nerve to tell me to add bars leaks!

This is a three row, They will make hose connection in same location as now. I will have just enough clearance before back of LS1 fan gets close to belt

[IMG][/IMG]

The other manufacture welds even around neck

[IMG][/IMG]

Last edited by shoebox66; 04-26-2011 at 12:34 PM.
Old 04-26-2011, 10:06 PM
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I'm glad you possibly have it figured out. I went through trouble shooting my whole coolant system yesterday and have it pinned down to either the radiator having a leak or being blocked. It sounds like we're going to have the same to do tasks coming up.
Old 04-26-2011, 10:39 PM
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Originally Posted by Beaflag VonRathburg
I'm glad you possibly have it figured out. I went through trouble shooting my whole coolant system yesterday and have it pinned down to either the radiator having a leak or being blocked. It sounds like we're going to have the same to do tasks coming up.
Yup I'm definitely changing radiator. I'm still deciding whether to buy Edelbrock High Flow pump or stock Delco.

I may even take that stupid ATI under-drive pulley off to.


Quick Reply: UPDATED :) Temp won't come down no matter what



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