Temp
Thread Starter
3rd Gear
Joined: Sep 2020
Posts: 3
Likes: 0
From: Hamlin New York
Temp
My car seems to be running unusually hot. Some days its fine and other she seems to run hot. Not really sure if i should just change the thermoustat or not just yet. I also noticed the fans dont really come on until I turn on the air.....
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Joined: Apr 2013
Posts: 5,025
Likes: 1,151
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
As said above Make sure the there is no trash blocking the air flow. Here is the factory settings for your fans
Depending on the model year...
For later model years:01-04
The low speed cooling fans are commanded on when the coolant temperature reaches 108°C (226°F). They are turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fans are commanded on when the coolant temperature reaches 113°C (235°F). They are 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 fans will be turned on at vehicle speeds less than 56 kPh (35 mph).
For early model years:97-00
Low speed fans come on at 219,high speed fans come on at 228,low speed with a/c on..
Depending on the model year...
For later model years:01-04
The low speed cooling fans are commanded on when the coolant temperature reaches 108°C (226°F). They are turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fans are commanded on when the coolant temperature reaches 113°C (235°F). They are 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 fans will be turned on at vehicle speeds less than 56 kPh (35 mph).
For early model years:97-00
Low speed fans come on at 219,high speed fans come on at 228,low speed with a/c on..
Thread Starter
3rd Gear
Joined: Sep 2020
Posts: 3
Likes: 0
From: Hamlin New York
Thank you for the quick responce. I believe it may just have been me overthinking it. If the High fan kicks in at around 236*. This would sound about right. The fans move freely with no blockage and they certainly kick on...
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Joined: May 2021
Posts: 86
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Gotta say what the coolant temp is, outside temp, standing traffic or moving, ac or no ac, air dam still installed, splitter, any mods to the car etc. “unusually hot” is too vague to help. 236 on a stock car in the winter is a lot worse than 236 in az summer 110° in standing traffic with the ac on full blast.
Last edited by Brewssard; Jun 10, 2021 at 05:10 PM.
Safety Car
Joined: Jul 2010
Posts: 3,950
Likes: 386
From: Chandler AZ
As said above Make sure the there is no trash blocking the air flow. Here is the factory settings for your fans
Depending on the model year...
For later model years:01-04
The low speed cooling fans are commanded on when the coolant temperature reaches 108°C (226°F). They are turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fans are commanded on when the coolant temperature reaches 113°C (235°F). They are 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 fans will be turned on at vehicle speeds less than 56 kPh (35 mph).
For early model years:97-00
Low speed fans come on at 219,high speed fans come on at 228,low speed with a/c on..
Depending on the model year...
For later model years:01-04
The low speed cooling fans are commanded on when the coolant temperature reaches 108°C (226°F). They are turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fans are commanded on when the coolant temperature reaches 113°C (235°F). They are 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 fans will be turned on at vehicle speeds less than 56 kPh (35 mph).
For early model years:97-00
Low speed fans come on at 219,high speed fans come on at 228,low speed with a/c on..
One time at drive thru at Culver's, with no A/C pretty miserable, said it was 125 out on ambient temp on HVAC, felt sick and my iPhone shut down and had a message about shutting down due to excessive heat, after that tried to only drive at night.
With A/C on it stays under 210, and in winter ( no A/C) it usually stays right at 198.
Last edited by 1999corvettels1; Jun 10, 2021 at 07:04 PM.
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Joined: Apr 2013
Posts: 5,025
Likes: 1,151
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
My 1999 C5 matches what you say for the later cars, at least low speed fans coming on at 226, and back off at 219. Have not had it get hot enough to have high speed on fans come on, and even in Phoenix summers, one year A/C was broken, max temp I've had was 228 and that's at long red lights or drive thru.
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Advanced
Joined: May 2021
Posts: 86
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My 1999 C5 matches what you say for the later cars, at least low speed fans coming on at 226, and back off at 219. Have not had it get hot enough to have high speed on fans come on, and even in Phoenix summers, one year A/C was broken, max temp I've had was 228 and that's at long red lights or drive thru.
One time at drive thru at Culver's, with no A/C pretty miserable, said it was 125 out on ambient temp on HVAC, felt sick and my iPhone shut down and had a message about shutting down due to excessive heat, after that tried to only drive at night.
With A/C on it stays under 210, and in winter ( no A/C) it usually stays right at 198.
One time at drive thru at Culver's, with no A/C pretty miserable, said it was 125 out on ambient temp on HVAC, felt sick and my iPhone shut down and had a message about shutting down due to excessive heat, after that tried to only drive at night.
With A/C on it stays under 210, and in winter ( no A/C) it usually stays right at 198.
Last edited by Brewssard; Jun 10, 2021 at 07:22 PM.
Safety Car
Joined: Jul 2010
Posts: 3,950
Likes: 386
From: Chandler AZ
This was the first time I have heard early years had lower settings, so I even did a search and saw Evil Twin say what you said, and he was somehow involved with C5 when they were built.
I swore the fan kicked on at 226 by watching the digital temp on DIC and see it lower to 219 and stop hearing the fan running, but it must be I was hearing the high speed of fans kick off and go to low speed, and low speed must not be as easy to hear from driver's seat.
A long time ago I noticed sitting at drive thru or long red lights with A/C there would be a surge, especially at night with headlights on, the blower motor would lower speed as the headlights dimmed then went back (for maybe a split second), it would do it every once in a while and must have been high speed in fans kicking in.
I have heard Lake Havasu is hotter than Phoenix, not sure about Las Vegas.
Safety Car
Joined: Jul 2010
Posts: 3,950
Likes: 386
From: Chandler AZ