SMFletcher91
New member
I have an automatic 2014 Chevy Sonic LT 1.8l with approximately 133,000 miles. My AC is blowing warm air out. No codes are appearing on OBDII scans. I'm thinking it's the pressure switch or the thermostat, but I'm not sure how to test either. I'll note some important things and then cover some of the troubleshooting already performed.
First thing to note, the car was overheating at one point, turns out the cooling fan connector had blown. Replaced the connector, everything was fine, then blew again about three weeks later. This time, I replaced the connector and the cooling fan, but it was during this second cooling fan/fan connector problem that the AC also quit working (after it failed the second time, but before replacing the fan and connector). The cooling fan is now kicking on around approximately 220 degrees and cooling as expected, BUT, it will not kick on if forced anymore by turning on max AC. I could be wrong, but it seems like I could force the fan to kick on for troubleshooting before the second cooling fan failure.
Also to note, the air delivery mode control on the climate control is extremely difficult to turn, and I have to force it almost to what the extent of breaking it to get it to change, but once it starts moving, it moves freely until it settles again for a few minutes.
Troubleshooting done so far:
1. Checked refrigerant levels, they are good.
2. Checked all fuses and relays. No blown fuses, resistance is good on relays, swapping them around does not change anything.
3. Clutch is not engaging, but after checking, is not getting any voltage to it.
4. Unplugging the battery for at least five minutes is not fixing my AC problem.
I've read similar problems on here, and although the common fixes seem to be the pressure switch or the thermostat, I'm trying to determine if there's a way to test either before replacing. Also, looking for other troubleshooting techniques or suggestions as to what else may be wrong.
Sent from my Pixel 3 XL using Tapatalk
First thing to note, the car was overheating at one point, turns out the cooling fan connector had blown. Replaced the connector, everything was fine, then blew again about three weeks later. This time, I replaced the connector and the cooling fan, but it was during this second cooling fan/fan connector problem that the AC also quit working (after it failed the second time, but before replacing the fan and connector). The cooling fan is now kicking on around approximately 220 degrees and cooling as expected, BUT, it will not kick on if forced anymore by turning on max AC. I could be wrong, but it seems like I could force the fan to kick on for troubleshooting before the second cooling fan failure.
Also to note, the air delivery mode control on the climate control is extremely difficult to turn, and I have to force it almost to what the extent of breaking it to get it to change, but once it starts moving, it moves freely until it settles again for a few minutes.
Troubleshooting done so far:
1. Checked refrigerant levels, they are good.
2. Checked all fuses and relays. No blown fuses, resistance is good on relays, swapping them around does not change anything.
3. Clutch is not engaging, but after checking, is not getting any voltage to it.
4. Unplugging the battery for at least five minutes is not fixing my AC problem.
I've read similar problems on here, and although the common fixes seem to be the pressure switch or the thermostat, I'm trying to determine if there's a way to test either before replacing. Also, looking for other troubleshooting techniques or suggestions as to what else may be wrong.
Sent from my Pixel 3 XL using Tapatalk