1991 c4
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3rd Gear
Joined: Mar 2017
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1991 c4
my Ac stopped working, and blows hot air. I changed the system to r34 changed the low pressure sensor and put in a new dryer. this worked for one day,then when I turned the AC on blew hot air and the code showed 09 low coolant. Where is low coolant sensor? How do I get it from turning off my compressor? The gauges show freon is full and has good presure.
Last edited by Rick Hendrick; Mar 13, 2017 at 05:09 PM.
Thread Starter
3rd Gear
Joined: Mar 2017
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hot air was blowing from the AC. The mac changed the R12 to R34 and this worked for one day. I then took my Vett to the Chevy garg and there they ran the dio test changed and recharged the system with new R34 a new low pressure switch and dryer. that worked one day I checked the code on the dash unit and still came up 09. 
Team Owner
Joined: Jul 2004
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From: Hartford WI
hot air was blowing from the AC. The mac changed the R12 to R34 and this worked for one day. I then took my Vett to the Chevy garg and there they ran the dio test changed and recharged the system with new R34 a new low pressure switch and dryer. that worked one day I checked the code on the dash unit and still came up 09.
The way to do it is to check the pressure and find out WHY it didn't work. IF the pressure is low, where is the leak? If you are converting, you have to change the O-rings and evacuate the compressor to get the R12 fluid out and change the Receiver/Dryer.
Thread Starter
3rd Gear
Joined: Mar 2017
Posts: 3
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Are you sure you can do that? Change from R12 to R134A without doing anything else? IIRC, that can be a problem.
The way to do it is to check the pressure and find out WHY it didn't work. IF the pressure is low, where is the leak? If you are converting, you have to change the O-rings and evacuate the compressor to get the R12 fluid out and change the Receiver/Dryer.
The way to do it is to check the pressure and find out WHY it didn't work. IF the pressure is low, where is the leak? If you are converting, you have to change the O-rings and evacuate the compressor to get the R12 fluid out and change the Receiver/Dryer.
Team Owner
Joined: Jul 2004
Posts: 28,463
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From: Hartford WI
https://www.corvetteforum.com/forums...hp-tuners.html
