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AC CLUTCH NOT ENGAGING

Tiny
H T MILAN
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 3.1L
  • 6 CYL
  • FWD
  • AUTOMATIC
Where is ac low pressure switch?
Monday, June 9th, 2014 AT 4:41 PM

12 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Those switches dont fail that often more then likely your low on ac charge what is your low side pressure reading?

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

and

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Here are the pressure switch for the air conditioner system.

Check out the diagrams (Below)

Please run some tests and get back to us.

Cheers
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Monday, June 9th, 2014 AT 4:56 PM
Tiny
H T MILAN
  • MEMBER
  • 5 POSTS
Its low and cannot get ac clutch to engage wanted to bypass it
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Monday, June 9th, 2014 AT 5:00 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Two problems with that it still wont blow cold air and its dangerous to do that because thats a safety device. Why would you want to do that?
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Monday, June 9th, 2014 AT 5:27 PM
Tiny
H T MILAN
  • MEMBER
  • 5 POSTS
I want to get clutch engaged to refill refrigerant
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Monday, June 9th, 2014 AT 5:39 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
You shouldnt have to jump it to refill it I have never had to do that to refill it start it up with the ac on when there is enough charge in the system the ac clutch will kick on and suck the rest in. Trust me you especially dont want to charge the system with the switch bypassed with a can of ac charge in your hand. If for some reason the pressure rose too high and ac was able to kick off. That can could kill or injury you.
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Monday, June 9th, 2014 AT 6:05 PM
Tiny
H T MILAN
  • MEMBER
  • 5 POSTS
Will try that and see if it kicks on, thanks and will let everyone know.
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Monday, June 9th, 2014 AT 6:14 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Your welcome also make sure your only charging on the low side. Keep me posted on how it goes.
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Monday, June 9th, 2014 AT 6:31 PM
Tiny
H T MILAN
  • MEMBER
  • 5 POSTS
Sorry for delay but had dental work and u know bu t got system charge without needing to jump low press switch. Thanks again.
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Friday, July 4th, 2014 AT 6:16 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Your welcome glad I could help have a safe and happy fourth of july.
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Friday, July 4th, 2014 AT 6:37 AM
Tiny
OLDDAWG99
  • MEMBER
  • 1 POST
If I understand your advice correctly, if I attempt to add refrigerant to this AC system while the compressor is not running, it will actually take the freon into the system and bring the pressure up until it is in the proper range for the compressor to kick in? I was under the impression that you had to jump the low pressure switch (which is different on these models) to cause the compressor to run so that the low side would create the suction necessary to pull the freon in.

If my clarification question is accurate, what is the minimum pressure required for these compressors to kick in?
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Saturday, August 23rd, 2014 AT 2:57 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
You should never have to bypass the pressure switch thats a safety device and wouldnt want that not working while charging the system. If you put enough charge in the pressure will turn the compressor on to help suck the reset of the charge in. Iam not sure of the exact pressure to turn it on I would say around 60psi.
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Saturday, August 23rd, 2014 AT 8:40 PM
Tiny
OLDDAWG99
  • MEMBER
  • 1 POST
Yep got it, it was low on freeon ;)
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Monday, August 25th, 2014 AT 8:45 PM

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