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2018 Impala NO AC!! Code P0532 HELP!!

285 Views 4 Replies 5 Participants Last post by  hatzie
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 ?
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P0532 = A/c refrigerant pressure sensor circuit low input.
You more than likely overfilled it when you recharged it. Those recharges in a can are a scam and do more harm than good. A professional AC shop with the proper tools and equipment and the knowhow to get the job done is going to have to be your next bet.
Overfilling the system can result in damage and then leakage. The AC refill cans at Walmart make it seem so easy, but it really is rather's not that DIY can't do it, but it does take some additional specialty tools most don't have....
Get a good set of manifold gauges, oil charge injector, can tap, and service port Schraeder valve tool.
Good tools are always worth the price.
You can rent the vacuum pump from O'Riley or Advance auto parts.

Yellow-Jacket-42006-Manifold-Gauge set
Yellow-Jacket-69567-Oil & Dye Injector-AC Service tool
Service port valve removal tool & replacement valve kit

I have Yellow Jacket service port adapters. They are around $70 each so almost as much as the manifold gauge set. You get what you pay for. You can probably get away with cheaper but I don't feel like fighting with my AC tools.
Yellow Jacket 41337 R134a high side service port adapter
Yellow Jacket 41338 R134a low side service port adapter. NOTE the oil/dye injector comes with this service port adapter.

If you're going to service R1234yf you'll get to buy two more adapters.

I use the side pierce tool for the 12oz cans but most folks use the tool that screws on the top. Personal preference IMHO.

This is the GM Service Training Group fundamentals of AC service textbook.

Look up the EPA 609 certification rules and exams so you don't screw up.
If the system still has a charge get the refrigerant reclaimed before you work on it.
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