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AC problems

Tiny
BETTY JO TURNER
  • MEMBER
  • 2015 VOLKSWAGEN PASSAT
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 73,000 MILES
AC was working, sometimes when turned off it would continue to blow cold air like it was not turned off. A couple of times there was this loud noise sounded like a hose come loose, but could not find any hose loose. AC continued working. Now it is blowing hot air and when AC turned off it stays engaged. Help please.

Can you post an diagram of the relay? Trying to find location of that and the thingy that is supposed to turn when going from hot to cool. (Actuator?)
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Thursday, August 23rd, 2018 AT 2:24 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like the temperature blend door actuator is having an issue. Here is a guide the show you step by step what you are in for with diagrams below to help you see the location of the temperature blend door below:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are all the blend door actuators for you car (below). Please let us know what happens.

Cheers, Ken
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Friday, August 24th, 2018 AT 7:24 PM
Tiny
BETTY JO TURNER
  • MEMBER
  • 5 POSTS
Thank you. Fixing to check this out, but wanted to say earlier that when I put it on heat it works and when I put it on cool it stops blowing hot, but it does not blow cold. FYI
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Saturday, August 25th, 2018 AT 10:27 AM
Tiny
KEN L
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  • 48,363 POSTS
Okay, lets check the large refrigerant line going into the firewall with the engine running and the AC on give it about two minutes and then feel the line it should be cold. Please let me know what you find.

Cheers, Ken
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Saturday, August 25th, 2018 AT 1:20 PM
Tiny
BETTY JO TURNER
  • MEMBER
  • 5 POSTS
It is not cold.
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Sunday, August 26th, 2018 AT 11:21 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Okay, we are getting closer, lets check the systems refrigerant level is sounds, like it is low. Here is a video to help you:

https://youtu.be/uZrQCGwXfek

Please run down this guide and report back.

Cheers, Ken
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Sunday, August 26th, 2018 AT 11:51 AM
Tiny
BETTY JO TURNER
  • MEMBER
  • 5 POSTS
It is not low, in fact it shows it is full and even had to release some because it was going to the red.
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Sunday, August 26th, 2018 AT 11:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Good find! An over charged system will not work as well. I would install a set of gauges to check the high side and to make sure the compressor is pumping refrigerant. Here is a guide to help you see what I am talking about:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Please run down this guide and report back.

Cheers, Ken
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Monday, August 27th, 2018 AT 9:49 AM
Tiny
BETTY JO TURNER
  • MEMBER
  • 5 POSTS
The pressure is reading 20 on both gauges with car running or not.
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Tuesday, September 4th, 2018 AT 1:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yes, way too low. The system must have a leak. This guide will help us find it.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Please run down this guide and report back.
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Wednesday, September 5th, 2018 AT 9:56 AM

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