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Old 10-07-2011, 07:18 AM   #1
OH vette
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AC light comes on when i select DEFROST!

does anyone know whats going on when I have heat on and want to turn it to defrost or a combination of defrost and when i do, the AC light comes on...as if the ac is now turning on!!

when i hit the ac , as to turn it off...it just blinks...

i have to get out of any defost mode to turn off the blinking or solid AC light.

I know i have been in defrost before with out the ac on...so i dont know if it is a new issue...or, it is just a sequence that i have gone though that is resulting in both the ac and defrost trying to come on

anyone got any ideas?

also does anyone know what the reserve gas capacity is on a 2000 corvette? I went lower than i ever have this past weekend..and put in 16.8 gallons of gass.....

thanks


OH
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Old 10-07-2011, 07:31 AM   #2
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If memory serves correctly, the gas tanks hold a total of 18 gallons of gas- check your owners manual to make sure.

Let me go look something up and I will get back to you on the A/C light.
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Old 10-07-2011, 07:33 AM   #3
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Two questions.

Does the display on your HVAC unit work? If so, is the correct outside temperature being displayed?
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Old 10-07-2011, 08:28 AM   #4
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The AC is supposed to come on. Air conditioning removes moisture from the air. This is how defrosting works. You can have warm conditioned air, not just cool conditioned air.
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Old 10-07-2011, 08:29 AM   #5
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Quote:
Originally Posted by WildKarrde View Post
The AC is supposed to come on. Air conditioning removes moisture from the air. This is how defrosting works. You can have warm conditioned air, not just cool conditioned air.
That is what I thought, I was just trying to find it in writing somewhere.
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Old 10-07-2011, 09:21 AM   #6
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Quote:
Originally Posted by Junkman2008 View Post
Two questions.

Does the display on your HVAC unit work? If so, is the correct outside temperature being displayed?
for sure there have been times when the reading was way off!!!....

then one day it looks like its reading pretty close to what it really is..

does that tie into the ac light blinking when i try to turn it off..??

I think i remember in the winter, that the ac light DIDNT come on when I tried to turn the defrost on...

I think there was also a time when I just hit the defreost BUTTON, and circumvented the MODE SELECTION .

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Old 10-07-2011, 12:51 PM   #7
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Quote:
Originally Posted by WildKarrde View Post
The AC is supposed to come on. Air conditioning removes moisture from the air. This is how defrosting works. You can have warm conditioned air, not just cool conditioned air.


Yep thats the way it works. Unless the A/C compressor is on it wont be able to remove the moisure from the air and clear the windshield. Same in just about all cars.
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Old 10-07-2011, 05:49 PM   #8
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Quote:
Originally Posted by OH vette View Post
for sure there have been times when the reading was way off!!!....

then one day it looks like its reading pretty close to what it really is..

does that tie into the ac light blinking when i try to turn it off..??

I think i remember in the winter, that the ac light DIDNT come on when I tried to turn the defrost on...

I think there was also a time when I just hit the defreost BUTTON, and circumvented the MODE SELECTION .

OH
Well one thing that will create havoc is if the outside temperature is reading incorrect (for example, it reading too low), the AC won't come on because the system thinks that it is winter outside. The way a HVAC system works is it will default to heat if it ever breaks because you can drive a car in the summer with no AC, but you can't drive a car in the winter with no defrost.

If the outside temperature is reading incorrectly, then your outside temperature thermostat is bad. It is a cheap part and a easy fix. It is located on the front skid, on the passenger's side. Try unplugging it and plugging it in again just to make sure that it is not just loosely connected before you buy a new one.

This fix will only work if the digital display is showing the wrong outside temperature.

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Old 10-08-2011, 03:07 AM   #9
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I too have noticed this now that's is getting cooler up here in the north east and I figured something was wrong. My outside temp is reading correctly.
Thanks for bringing this up OH Vette.
As far as I'm concerned my question has been answered as well.
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Old 10-08-2011, 07:45 PM   #10
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If I remember correctly, the owners manual states the a/c compressor will not come on when the outside temp is something like 35deg and below.....to protect the system from freeze up. Other than that, the a/c comp. will operate with in the defrost mode to remove humid air...as stated earlier.

Read the manual for details.
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Old 10-10-2011, 08:18 AM   #11
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thanks for the tip Junkman.... Ill check it today, but I am thinking SOMETIMES thew temps dont seem right...reading too low....but other times it seems right... gonna be 80 today....nice convertible day!!!

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