External Temp reading

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Jan 17, 2005 | 10:06 AM

sempi

Thread Starter

Racer

Joined: Mar 2004

Posts: 271

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From: Stockton CA

External Temp reading

Can anyone confirm that the external temp reading on a C5 will read negative numbers? Realizing that most of you don't let your Vettes see this, but mine is a dd, and this morning, pulling out of the garage, I was reading 3 degrees, and within a mile I was reading zero for the rest of the 12 miles to work. It could have been correct at zero degrees, but I kept waiting to see -1, and it never happened.

TIA

Sempi

Jan 17, 2005 | 11:20 AM

roscoe118

Safety Car

Joined: Apr 2004

Posts: 3,737

Likes: 10

From: Austin, Texas

Can't help you there, and MAN I hope I never find out

Jan 17, 2005 | 02:04 PM

Wolfmanjohn

Melting Slicks

Joined: Jan 2004

Posts: 3,225

Likes: 0

From: Currently living in and loving... Chico, CA

Hope this helps somewhat, although it will not directly answer your question.

From the HVAC section of the factory service manual published by Helm: "The sensor operates within a temperature range between -40 degrees C (-40 degrees F) to 101 degrees C (215 degrees F). The sensor signal varies between 0-5 volts."

Later on in the same section: "The Driver Information Center (DIC) displays the ambient air temperature value that it receives from the HVAC control module through a class 2 message. (say WHAT?) The scan tool has the ability to update the displayed ambient air temperature. The ambient air temperature value is displayed or updated under the following conditions:

At start up with the engine off more than 3 hours - displays real-time temperature

At start up with the engine off less than 3 hours - displays last stored temperature

Vehicle moving above 26 km/h (16 mph) for 1.5 minutes - displays real time temperature

Vehicle moving above 72 km/h (45 mph) for 1 minute - displays real-time temperature"

But nowhere in this diatribe does it specifically state that the HVAC module will display negative ambient temperature readings. One can only conclude.

Jan 17, 2005 | 03:03 PM

sempi

Thread Starter

Racer

Joined: Mar 2004

Posts: 271

Likes: 0

From: Stockton CA

Thanks for the info, WolfManJ-,
That's good, but would still be interesting to find out. I was also wondering if I was going to have trouble with the throttle bypass I did while I was in Calif. last year. So far, no ill effects.
Someone on this forum has to know the answer to this, as I be hoping I don't have to find out.

Sempi
Stuck in the Siberian mid-West.
Lenore (my '98 Coupe) hates this weather as much as I do, having
grown up in Arizona.

Jan 17, 2005 | 04:59 PM

Dan_the_C5_Man

Le Mans Master

Joined: Dec 2003

Posts: 5,561

Likes: 448

From: Atlanta metro Ga.

I'll ***-u-me yes, since I saw -1 degree Centigrade last night (31 degrees F.) The next time you are in sub-32 degree F weather, just flip the DIC over to metric, and you'll see negative numbers (in Centigrade anyway). No reason to believe it would not read below 0 degrees F.

Jan 17, 2005 | 06:50 PM

ICUALL

Drifting

Joined: Jul 2002

Posts: 1,329

Likes: 8

From: Corpus Christi Tx.

Yes

Every time I wash the car my goes in steps down to -32 degrees, after the connector has time to dry it works fine. So YES it will display negative numbers.

Jan 17, 2005 | 08:42 PM

sempi

Thread Starter

Racer

Joined: Mar 2004

Posts: 271

Likes: 0

From: Stockton CA

Thanks

Thanks for the info, guys. Just found that out as I did switch it over to centigrade.
It's still too cold, no matter how you read it.

Sempi

Last edited by sempi; Jan 17, 2005 at 08:44 PM.

Jan 17, 2005 | 08:44 PM

Y2Kvert4me

Race Director

Joined: Oct 2002

Posts: 16,477

Likes: 26

From: Gone

CI 6-7-8-9-10 Veteran

St. Jude Donor '03

Yes, it will. I saw -5f on it this past Friday. The roads were clean and not salty, so I took it to work. First time I drove it in 2005 actually.

Lowest I ever saw on it was -12.