HVAC / Climate Control Problem
Thread Starter
Heel & Toe
Joined: Jul 2002
Posts: 16
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From: Oak Ridge TN
HVAC / Climate Control Problem
I have a 97 coupe with an interesting HVAC problem. When the temp gets hot outside, The AC stops working (never a problem with the heater). When I press the AC button, the led in it flashes three times, then goes off; the AC will not stay on. When this happens, it throws an HVAC code, and will not operate again until a) the code is cleared, and b) the temp outside is <75 degrees (who needs ac then?). Is this the control unit, a bad sensor, or what? Any and all recommendations are appreciated. Thanks.
Safety Car
Joined: Jan 2005
Posts: 3,896
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From: Manchester - Political correctness is tyranny with manners.
Originally Posted by RaserX
I have a 97 coupe with an interesting HVAC problem. When the temp gets hot outside, The AC stops working (never a problem with the heater). When I press the AC button, the led in it flashes three times, then goes off; the AC will not stay on. When this happens, it throws an HVAC code, and will not operate again until a) the code is cleared, and b) the temp outside is <75 degrees (who needs ac then?). Is this the control unit, a bad sensor, or what? Any and all recommendations are appreciated. Thanks.
Safety Car
Joined: Nov 2001
Posts: 3,753
Likes: 191
From: Orange County California
I dont know if you have auto climate control but on mine i have had this problem lately in the spring here.
What my issue is is that i guess under 40 degrees the A/C won't come on. My car was reading that it was under 40 on the ext temp display when it was really 60-70. Now that it is 80-90 it is reading that it is like 50-55 out so it works. I need to get it fixed but probably not anytime soon as it works for the summer so i am good to go.
What my issue is is that i guess under 40 degrees the A/C won't come on. My car was reading that it was under 40 on the ext temp display when it was really 60-70. Now that it is 80-90 it is reading that it is like 50-55 out so it works. I need to get it fixed but probably not anytime soon as it works for the summer so i am good to go.
Melting Slicks
Joined: Aug 2003
Posts: 2,009
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From: gainesville fl
As was mentioned previously, it sounds like low refrigerant. There is a low pressure sensor that shuts the system down to save the compressor. If I remember correctly, the blinking LED is an indicator of low pressure.
Thread Starter
Heel & Toe
Joined: Jul 2002
Posts: 16
Likes: 0
From: Oak Ridge TN
I just found another post (http://forums.corvetteforum.com/show...738&forum_id=1) where the problem sounds the same, and his problem was low freon. I'll get it checked asap. Thanks for all the replys! 
