So recently I’ve noticed my high fan turning on as soon as I start the car.. and when I shut it off it stays active for maybe 2 minutes! The car wasn’t overheating so I said I’ll get that checked out later .. with that the ac still ran fine blowing cold air! Now about a week ago I was driving with the air on for about 20/30 minutes and out of no where it got warm and the cabin was getting hot. Drive it the next day and the same thing happened , worked for a minute then blew out hot air. So I thought it maybe just needed a recharge, so I did that but the system was full. Now the ac is completely out won’t turn on and blowing out hot air!

Checked the ac and the clutch isn’t turning on and I got a cel code P0532 so I replaced that sensor that was located on the condenser (think it’s called the Low pressure switch) but nothing happened the clutch still wouldn’t engage. I jumped the clutch with some wires just to test and see would it engage and it did .. all fuses and relays were fine so I took it to a local shop.

After them checking it for about a hour he stated they needed more time to look at it so try back tomorrow but he said he thinks it’s a high pressure switch that needs replace .. but I was tools these cars doors t have them .. for some reason the mechanic pulled off the passenger kick panel and was looking under the dash so I’m not sure if it was a switch there or not but I haven’t took it back yet trying to figure it out myself do you guys have any knowledge as to what’s going on with it ?

 

the p0532 sets when the ac pressure sensor reads a pressure less than 1 psi. if the charge level is ok....you have a wiring, sensor or pcm problem. With the scan tool....the tech should be able to monitor live sensor data. Unplugging the switch should set a high code....jumping the 5volt to signal line should set the low code...this is a fast and easy way to verify the wiring and ecm are ok.

modern systems use one pressure sensor that read the actual pressure vs old systems that use low and high pressure cut off switches.

just make sure you verify the charge by weight not using a refilling kit with a pressure gauge...not accurate.

 

AC issues 2018 blowing hot air compressor not engaging nor fans turning on when ac is on

 

verify the refrigerant charge level by having the system recovered. the compressor will not engage if the charge level is low.