You can have the AC on and, at the same time, have the temp. Set to HOT. So, YES, you can have them both on at the same time. In your first post, you mentioned that the AC was cycling too much. If it's cycling pretty fast, that usually means that the system is low on freon. The low pressure switch is turning it off when it gets to a low pressure condition. OR. The HIGH side could be 'pegging' out and the same thing could happen. If the orfice is stopped up, when the compressor engages, the high side will increase pressure quickly and the HIGH pressure switch will cut it off. You'll need to connect a set of AC guages to varify.
I just read up on this system. The temp. Is controlled by an electric motor. There are 3 vacuum actuators but NONE of them control the temperature. They control the floor/panel, fresh air/recirc, and panel/defrost. The blend door(temp.) Is controlled by an electric actuator.
The code 02 you mentioned is for EATC connector and blend door actuator. I think we're on to something here. It's telling you that there is a problem with the actuator and that's why you can only get heat out of the vents. Go directly to the actuator. I'm pretty confident that you'll solve your problem by replacing it. First make sure it's plugged in.
You can test it if you like. Find the wires going to the actuator. (Purple and Brown/light green) Apply battery voltage to one wire at a time. The actuator should move in one direction. Change wires and the actuator should move in the opposite direction. If it doesn't, replace it. If it does, repost and let me know and I'll walk you through further diagnosing.
Saturday, December 6th, 2008 AT 10:48 AM