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Oct 21, 2010 | 03:46 PM

Joe Babe

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Instructor

Joined: Oct 2009

Posts: 176

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From: queens N.Y.

hi heat

what's the highest temp for a C5 before it boils out.... I hit 225 in traffic and was worried!

Oct 21, 2010 | 04:02 PM

hotwheels57

Race Director

Joined: Jan 2006

Posts: 10,554

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From: Not on either liberal coast.

225 degrees is nothing to be worried about. It's normal for a C5 LSx motor unless your original fan settings have been modified for some reason. It's probably pretty standard for many modern emissions controlled fuel injected cars.

This was easily found in C5 Tech, using search or search this forum (in the red banner) with keywords "original fan temperature settings"...

QUOTE:

"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)."

Last edited by hotwheels57; Oct 21, 2010 at 04:05 PM.

Oct 21, 2010 | 04:21 PM

KenShores

Burning Brakes

Joined: Apr 2009

Posts: 778

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From: Chantilly VA

Quote:

Originally Posted by hotwheels57

Thanks for finding this in the search. It is at times difficult to phrase the search in such a manner to find exactly what your looking for. I did remember "if the A/C" is running, one of the fans will turn on, below a speed, but forgot the speed. I used this while stuck on an interstate backup to cool the car temps. Do you know about safe/high trans fluid temps?

Last edited by KenShores; Oct 21, 2010 at 04:43 PM.

Oct 21, 2010 | 04:38 PM

srs244

Safety Car

Joined: Sep 2005

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From: Southeast, Tennessee

St. Jude Donor '09 thru '26

if you become concerned at that temp (225) flip in your a/c and the fans will (or at least should) come right on. if not, they will come on very shortly.

Oct 21, 2010 | 04:39 PM

hotwheels57

Race Director

Joined: Jan 2006

Posts: 10,554

Likes: 33

From: Not on either liberal coast.

Quote:

Originally Posted by KenShores

Thanks for finding this in the search. It is at times difficult at times to phrase the search in such a manner to find exactly what your looking for. I did remember "if the A/C" is running, one of the fans will turn on, below a speed, but forgot the speed. I used this while stuck on an interstate backup to cool the car temps. Do you know about safe/high trans fluid temps?

Sorry I don't. I have the 6 speed w/o a gauge for it. I have (only) read that temperatures over 200 degrees will deteriorate the effectiveness of the ATF and potentially damage seals on an automatic transmission. 165 to 175 degrees seems to be the preferred range. I don't know if that's the same for a manual transmission car.

Last edited by hotwheels57; Oct 21, 2010 at 04:46 PM.