What temp??
Thread Starter
Pro
Joined: Sep 2008
Posts: 510
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From: oceanside CA
you would think it would be set a lot lower than that... maybe its just me but with my 1970 nova i never had temps above 190 and if i did i was on the side of the road overheating... now i know their completely diff motors (old school 350 Vs. LS1) but are they ment to run that hot?
Race Director
Joined: Jul 2007
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From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
The newer cars run hotter with the emissions they have, I sent out my ECU to Chuck CoW for the Christmas mail order tune special he was running and he did a great job, I have a 160 stat and I think my fans come on now around 185-190. It wasn't uncommon for my car to run around 215-220 here in the Nevada summer.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
With the HVAC off, they will turn on at 226 in series mode or low speed. At 235, they'll turn on in parallel mode or high speed unless its been tuned in whatever way and the setpoints were changed.
Le Mans Master
Joined: Feb 2003
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From: Memphis Tennessee
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
For a 1998 automatic, the stock fan setpoints are as follows:
Fan1 on at 226.4, off at 219.2
Fan2 on at 236.4, off at 227.3
Computers have done amazing things for closely controlling things like engine temperature.
Your old-skool engine relied on the thermostat, the efficiency of the radiator, and probably a clutch-type fan bolted to the water pump. That's it...where the actual temps resided depended on the performance and combination of those 3 items.
Today, those 3 items still exist...with the exception of the computer-controlled electric fans.
The normal (moving) engine temps are still the same as old-skool...dictated by radiator efficiency, and thermostat rating.
Only the stopped/idling temps are controlled by the fan actuation. And the difference being, is you can now allow the engine to run much hotter, while still having very tight control of exactly HOW hot it gets.
On a C5 in stock form, there is no reason to be concerned about 220, even 230* temps. If you see it go over 235, then there is likely a problem with the cooling system. If not, it's still well within the range of control, and should be considered normal.
Fan1 on at 226.4, off at 219.2
Fan2 on at 236.4, off at 227.3
you would think it would be set a lot lower than that... maybe its just me but with my 1970 nova i never had temps above 190 and if i did i was on the side of the road overheating... now i know their completely diff motors (old school 350 Vs. LS1) but are they ment to run that hot?
Your old-skool engine relied on the thermostat, the efficiency of the radiator, and probably a clutch-type fan bolted to the water pump. That's it...where the actual temps resided depended on the performance and combination of those 3 items.
Today, those 3 items still exist...with the exception of the computer-controlled electric fans.
The normal (moving) engine temps are still the same as old-skool...dictated by radiator efficiency, and thermostat rating.
Only the stopped/idling temps are controlled by the fan actuation. And the difference being, is you can now allow the engine to run much hotter, while still having very tight control of exactly HOW hot it gets.
On a C5 in stock form, there is no reason to be concerned about 220, even 230* temps. If you see it go over 235, then there is likely a problem with the cooling system. If not, it's still well within the range of control, and should be considered normal.
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Thread Starter
Pro
Joined: Sep 2008
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From: oceanside CA
ok so no concern for 230* temps that i have been seeing a lot!!! but lets say i wanted to get a computer tune anyways....( to also lower the fan turn on temps) would a tune even be worth the money on a stock motor? all i have is a vararam and cat-back exhaust.
Race Director
Joined: Oct 2002
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
If you are done with it and have no plans to do any further mods, then yeah, a good tune will get you what you want.
If you are thinking about anything else down the road...headers, cam, blower.etc Then probably not worth spending the $ on a tune now.
If you are thinking about anything else down the road...headers, cam, blower.etc Then probably not worth spending the $ on a tune now.
Racer
Joined: Jan 2008
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From: New York
http://www.ls1tech.com/forums/advanc...mperature.html
Le Mans Master
Joined: Feb 2002
Posts: 6,937
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From: Waldorf MD
Here is the info:
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
Racer
Joined: Nov 2008
Posts: 484
Likes: 0
From: North Dallas area TX
Here is the info:
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
C5 Cooling Fans Operation
The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).
Racer
Joined: Jan 2008
Posts: 476
Likes: 1
From: New York
