Stimmel1647545512 Posted July 28, 2011 Report Share Posted July 28, 2011 99 c5 new water pump fresh coolant flush new stock thermostat coolant is full car has 100k on the clock car runs at 198-204 all day long sit in trafffic temp starts to climb i let it idle on the street after dinner while moving the 73 for a few , got in temp said 228 kinda high for my likings any way to make sure the fans are working? the temp drops pretty well when i turn the heat on but thats works in everything.... just wondering if im missing something Quote Link to comment Share on other sites More sharing options...
Browning Posted July 28, 2011 Report Share Posted July 28, 2011 sounds like it needs burped Quote Link to comment Share on other sites More sharing options...
acklac7 Posted July 28, 2011 Report Share Posted July 28, 2011 Perhaps the coolant/water ratio is off? Back when I had my Cadillac (northstar) I would get crazy temp readings if the mixture wasn't 50/50 on the dot. And the caddy needed burped like no other, however it would overheat whenever it had an air pocket, as opposed to just run hot. Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted July 28, 2011 Report Share Posted July 28, 2011 Does it have the stock temp Thermostat? If it does it's a 205 temp. Quote Link to comment Share on other sites More sharing options...
AJ Posted July 28, 2011 Report Share Posted July 28, 2011 those run 220* normally. every LSx engine does until you install a lower temp stat and change the fan on temp. Quote Link to comment Share on other sites More sharing options...
hpfiend Posted July 28, 2011 Report Share Posted July 28, 2011 those run 220* normally. every LSx engine does until you install a lower temp stat and change the fan on temp. +1 I was a little unsettled as well when I noticed this... Quote Link to comment Share on other sites More sharing options...
acklac7 Posted July 28, 2011 Report Share Posted July 28, 2011 (edited) those run 220* normally. every LSx engine does until you install a lower temp stat and change the fan on temp. We had a GM powertrain engineer on Caddyinfo for years who gave us all sorts of insight on GM engines. One of the things he kept repeating over and over again was the fact that the Northstar/LSx engines were designed to run hot (220's - 230's) and they would live longer routinely operating at those temps. One thing he always stressed was NOT to change the thermostat/fuck with the fans - those Engines are designed to run @ high temps, decreasing the operating temp decreased the life of the engine. Should also add temperature concerns from "old timers" was one of the main reasons GM phased-out the digital temp readings on Cadillacs...I guess they got sick of people complaining that there car was running hot when it was simply running as designed. Edited July 28, 2011 by acklac7 Quote Link to comment Share on other sites More sharing options...
AJ Posted July 28, 2011 Report Share Posted July 28, 2011 We had a GM powertrain engineer on Caddyinfo for years who gave us all sorts of insight on GM engines. One of the things he kept repeating over and over again was the fact that the Northstar/LSx engines were designed to run hot (220's - 230's) and they would live longer routinely operating at those temps. One thing he always stressed was NOT to change the thermostat/fuck with the fans - those Engines are designed to run @ high temps, decreasing the operating temp decreased the life of the engine. Should also add temperature concerns from "old timers" was one of the main reasons GM phased-out the digital temp readings on Cadillacs...I guess they got sick of people complaining that there car was running hot when it was simply running as designed. for as many miles these cars are going to see i don't even see them failing because they were run cooler. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted July 28, 2011 Report Share Posted July 28, 2011 (edited) for as many miles these cars are going to see i don't even see them failing because they were run cooler. don't shoot the messenger. Trust me this guy would argue with TONS of people about the temp issues and he always won the argument because he would literally provide pages of evidence as to why it was beneficial for those high-performance engines to periodically run hot. Sadly GM found out about all of this and sued the board(s) and had all of his posts removed...bullshit. *removed most of his posts* If anyones interested some of his write-ups can still be found on cadillacowners under the screen name "chevelle", however most of his best posts under another user name have been removed. Edited July 28, 2011 by acklac7 Quote Link to comment Share on other sites More sharing options...
Linn1647545492 Posted July 28, 2011 Report Share Posted July 28, 2011 They make more power when they run cooler. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted July 28, 2011 Report Share Posted July 28, 2011 They make more power when they run cooler. Yea im by no means an expert, just repeating what I heard. As I recall there were issues with carbon build-up,gas mileage,and oil contaminants that were solved (or lessened) if the engines were allowed to periodically run in the 220's-230's. Quote Link to comment Share on other sites More sharing options...
Nitrousbird Posted July 28, 2011 Report Share Posted July 28, 2011 My bone stock LS1 runs around 165 fully warmed up. Quote Link to comment Share on other sites More sharing options...
BrianZ06 Posted July 28, 2011 Report Share Posted July 28, 2011 I have a 180 t stat and that is where it goes on these hot days. Cooler is better. I can feel a difference. What temp t stat do you have ? Quote Link to comment Share on other sites More sharing options...
Stimmel1647545512 Posted July 29, 2011 Author Report Share Posted July 29, 2011 its has a stock thermostat in it bought the whole housing and thermostat as one maybe a 180 will go in it here soon Quote Link to comment Share on other sites More sharing options...
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