I hope this isn't a dumb question. I drove my 2012 Prius Plug in over the July 4th weekend and left one of the lights on. The 12V battery completely died and I used a portable jump starter. Car started and still runs, but I noticed immediately that the AC no longer blew cold air (it was over 90 degree weather). I checked the AC fuse under the driver dash and in the engine compartment and they are both intact. Am I missing something? Should I check something else? I wonder now if this wasn't the cause, perhaps just a coincidence that the AC stopped working at the same time?
Could be coincidence... but also try and cycle through all the AC settings. Through hot back down to cold... recirc to air vent. It could be because of some glitch in the AC computers making it warm. Posted via the PriusChat mobile app.
And now that the battery is being jumped to start the car after the car is started. Do you have the normal 13.5 to near 14 volts just sitting there at the 12 volt battery sitting there running and ready if you've got out and put a DVOM on 12 V batt you see ??? 13.5 V ??? Or??
Before we get into diagnosis... Get a legitmate 12v battery charger of at least 8 amps and get your battery charged to 100%... Also replace or remove your cabin air filter. Then see if symptoms still occur.
Yep, get the 12VDC battery back to where it should be to see if you have an actual problem or simply a computer glitch caused by low voltage. These cars are well know for phantom trouble codes and strange operations with a low 12VDC battery. The reason your AC was blowing hot air, your system never switched the AC compressor ON. Not sure if your model has an AC "sight-glass" to verify refrigerant movement. Have a knowledgeable friend look under the hood or YouTube it. You simply follow the condenser lines to see if you have a sight-glass; Not every OEM installs these (cost reduction/savings) - but it makes troubleshooting a lot easier. Good Luck.....
My 2011 non-plug-in has it. Mendel has posted details from the service manual on how to check refrigerant level using the sight glass.
