Running Hot ?
Thread Starter
Instructor
Joined: Dec 2006
Posts: 109
Likes: 1
From: Jacksonville Fl
Running Hot ?
When I'm cruising the coolant tenp is 190-195 when I stop
for something then start up it goes to 220. When I get in stop and go traffic the same thing. Coolant is full,30000 miles. Had to put in about a gallon of water last yr because top of tank came loose. Any help on what to do would be appreciated.
for something then start up it goes to 220. When I get in stop and go traffic the same thing. Coolant is full,30000 miles. Had to put in about a gallon of water last yr because top of tank came loose. Any help on what to do would be appreciated.
Team Owner
Joined: Sep 2007
Posts: 21,915
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From: Miami Beach FL
Just went through mine last week. BTW, there's a fan controller on the parts board if that's an avenue you'd like to travel.
Pro
Joined: May 2004
Posts: 656
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From: Midwest
St. Jude Donor '08
My guess is that you have a sticking thermostat. I recently ran into the same symptoms as you're having in my WS6 LS1 Trans-Am. Changed out the stat, now all is good.
Here is my (NON-EXPERT) view.
When the stat doesn't open all the way, it restricts coolant flow to the radiator. At higher rpms (highway speeds), enough coolant volume is pumping through the system to cool the temps. At lower RPM not enough coolant is getting through the rad becuase on the partially closed stat to cool efficeintly.
Good luck.
Silverbird
Here is my (NON-EXPERT) view.
When the stat doesn't open all the way, it restricts coolant flow to the radiator. At higher rpms (highway speeds), enough coolant volume is pumping through the system to cool the temps. At lower RPM not enough coolant is getting through the rad becuase on the partially closed stat to cool efficeintly.
Good luck.
Silverbird
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From: Bel Air (by way of Fort Worth, TX) Maryland
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When I'm cruising the coolant tenp is 190-195 when I stop
for something then start up it goes to 220. When I get in stop and go traffic the same thing. Coolant is full,30000 miles. Had to put in about a gallon of water last yr because top of tank came loose. Any help on what to do would be appreciated.
for something then start up it goes to 220. When I get in stop and go traffic the same thing. Coolant is full,30000 miles. Had to put in about a gallon of water last yr because top of tank came loose. Any help on what to do would be appreciated.
Last edited by Chemdawg99; Apr 9, 2008 at 06:16 PM.
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Those really aren't bad temps. But I do agree with checking to make sure that the radiator area is clear of debris.
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Drifting
Joined: Apr 2007
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From: LEBANON PA.
Running Hot?
Hi there,
Those temperatures are in the normal range for the ls1 engine.Thermostats made today either work or they don't. Yours appears to be working.If your radiator is clean you might want to consider adding 2 bottles of water wetter available from auto zone.Note: When you add water to the surge tank it should be distilled water.If your radiator is full of debris (leaves etc.) you may want to consider installing a radiator screen from eliteengineeeringusa.com custom fit easy to install. I did & it keeps most of the junk & damaging rocks out of the front of my radiator about 100 dollars.
Hopes this helps you retired guy.
robsc501
Those temperatures are in the normal range for the ls1 engine.Thermostats made today either work or they don't. Yours appears to be working.If your radiator is clean you might want to consider adding 2 bottles of water wetter available from auto zone.Note: When you add water to the surge tank it should be distilled water.If your radiator is full of debris (leaves etc.) you may want to consider installing a radiator screen from eliteengineeeringusa.com custom fit easy to install. I did & it keeps most of the junk & damaging rocks out of the front of my radiator about 100 dollars.
Hopes this helps you retired guy.
robsc501
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Pro
Joined: Sep 2006
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From: Raymore, i.e., Kansas City MO
I read...
I remember reading somewhere that 254 degrees was the "danger" point. If the coolant temperature in the LS1 reaches that point, the engine starts firing on only 4 cylinders (I know that sounds strange, but I don't think I dreamed it.) I don't know what the purpose of that is other than to possibly decrease the friction that's taking place in the engine overall and allow the coolant to cool down.
Correct me if I'm wrong. I don't mind.
Michael in KC
Correct me if I'm wrong. I don't mind.
Michael in KC
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