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My 03 ZO6 has a good A/C but yesterday it started blowing hot air out of the center and drivers side A/C vents. The other vents blew out cold air, that is the passenger, and lower vents. Can anyone tell me why, and suggest a fix. I've never had this happed to me in any car I've ever owned.
x2. Had to replace mine. It worked for about six months and now when it’s hot everything fine. When cold out, drivers side and center blows hot and passenger blows cold. Gets hot out again then all goes back to normal ???
It could very well be an actuator, but try adding a can of Freon first. The AC systems don't work the way you think. When system gets a little low on Freon, it will just cool the passenger side, and drivers side will feel almost warm. There are a lot of threads on this, check it out before taking things apart. Let's us know how it goes.
You should check your codes before dismantling anything. As mentioned above, it might be an actuator-related problem, or simply that the system is a little low on refrigerant (since the cold side is the passenger's and not the other way around).
In any case, don't add refrigerant blindly. You could end up overcharging the system and creating additional problems.
Check both pressures to have an idea of how things are. Take a look at this Post. It has detailed instructions to check/add refrigerant.
-These are the CliffsNotes:
Check your pressures against the chart below (you'll need to determine ambient temperature and humidity first). Make sure you take your readings with:
Engine @ 2000 rpm
A/C in coldest setting
Fan at maximum speed
Both windows down
Thermometer in center air vent
When adding refrigerant, pay attention to both pressures, otherwise you might end up with the high side sky-high trying to get the low side to the chart's value.
you need the refrigerant not the coolant and the DIC will set a code for the actuator if it is bad. you can also clear the code if it is showing and the actuator will try to reset itself
Thank you for the information. I think I'll just take it to the shop and have them check the coolant and actuator..
As already mentioned, it's the A/C refrigerant pressures what needs to be checked, not the coolant.
If you can follow simple directions, checking the pressures is perfectly doable as a DIY. Major auto parts stores have a Tools Loaner Program, so you can get free A/C gauges for the job and return them when you're done.
A/C question?
