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Suddenly after the A/C was cold it started blowing hot air?

Tiny
BHAMDOC1973
  • MEMBER
  • 2012 MINI COOPER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 106,000 MILES
It was fine till one day I lose cold air for a little, then turned it off and on and it was fine. Today all of a sudden after it was cold became hot. Fan runs, checked Freon level but with compressor being off can't really measure much. Checked fuses they okay. Turned the compressor by hand and it turned. Not sure what to look for.
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Friday, August 19th, 2022 AT 12:33 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
So, if you have a refrigerant leak and the system is empty the compressor will not come on, this leak can occur when a rock hits the condenser just right it can cause a leak. You will need to connect a charge kit or A/C gauges with a bottle to add some to see if the compressor kicks on. Let me know, here are two videos to help us get started:

https://youtu.be/uZrQCGwXfek

and

https://youtu.be/4EqdrBVb0sY

Please run down these guides and report back.
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Friday, August 19th, 2022 AT 4:14 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
I tried but it is very difficult adding when the compressor is off. Where is the relay so I can at least jump it to see if it comes on and maybe add a bit or at least check how low it is. But this happened before once and then it came back freezing cold, so this sudden loss. I am sure it is the same as last time. And if I had a leak that big I would have seen it because I was in my driveway, heard no hissing and saw nothing leaking out.
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Friday, August 19th, 2022 AT 4:49 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Also, checked the power to compressor and it's there. Trying to find relay but these under the hood I trued jumping 87 and 30 nothing happened.
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Saturday, August 20th, 2022 AT 6:01 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Well dang, was checking relays and I removed the front one from the under-hood box, the car turned off, when I turned it back I got these codes and now no throttle response.
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Saturday, August 20th, 2022 AT 6:10 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Here and the battery volts are 12 not charging.
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Saturday, August 20th, 2022 AT 6:12 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Also, when I received the second relay to test it I jumped 87 and 30 and the wire got hot so I removed it. Then I removed the first relay and the car shut off.
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Saturday, August 20th, 2022 AT 6:19 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Also, power steering is hard and engine running rough, dang it. Not sure if the first relay is different than the rest but the numbers are on that specific one, even though all are interchangeable.
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Saturday, August 20th, 2022 AT 6:22 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
No won't start but for 1/2 a second then shuts off. Man what did I do?
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Saturday, August 20th, 2022 AT 4:34 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Found the issue because it won't run, fuse 5 was blown. Now the ac issue. I have another mini so I swapped the relays and still nothing. Swapped the relay in the kick panel on passenger which I think is the one for the compressor still nothing.
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Saturday, August 20th, 2022 AT 4:58 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,657 POSTS
Can you tell me if you know where the relay is for the compressor? And where is the low pressure switch and how to test it?
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Sunday, August 21st, 2022 AT 7:46 AM

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