Where is the low pressure A/C port

Tiny
PACKERS27
  • MEMBER
  • 2007 PONTIAC G5
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Okay, so I know that usually the low pressure A/C port is usually near the fire wall and it is a bigger line with the new style 134A fitting. But in my case the new style 134 port is near the oil dipstick. It's on the bigger line. The one near the firewall is the old style female threaded port. Both ports have black caps. Does anyone know where to charge the system? Also, the compressor will kick on for about 3 seconds and kick off and after 10-20 seconds, it will do it again.
Tuesday, August 20th, 2019 AT 1:20 PM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good evening,

I posted a picture of the fitting. It is on the line from the compressor to the evaporator.

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

Roy
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Tuesday, August 20th, 2019 AT 3:57 PM
Tiny
PACKERS27
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That fitting is the big one and doesn't fit on my recharge gauge but AutoZone told me that the smaller is always the low port. Especially since it's a 2007.
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Tuesday, August 20th, 2019 AT 4:42 PM
Tiny
ASEMASTER6371
  • MECHANIC
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R134 is the same for all cars. The fitting is on the large line from the evaporator to the compressor. The small line is the high side.

Roy
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Tuesday, August 20th, 2019 AT 4:45 PM
Tiny
PACKERS27
  • MEMBER
  • 205 POSTS
I got ya. One more thing, the compressor kicks on for a quick second and goes off. It does this every 10 or so seconds. I checked the codes and the other code that was popping up is a faulty engine coolant temperature sensor (P0117). Could that be causing the compressor to do that?
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Tuesday, August 20th, 2019 AT 5:12 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
No, codes are for fuel control issues. A/C system is not fuel control.

That may be the coolant sensor but has nothing to do with the A/C issue.

You need a set of gauges that will read both the high and low sides to monitor the pressure.

It may be low in Freon or the pressures may be off not allowing the compressor to stay activated.

Roy
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Tuesday, August 20th, 2019 AT 5:16 PM
Tiny
PACKERS27
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  • 205 POSTS
I want to change out the ECT. Is there more than one ECT? When I look at the diagram, it shows 7. Where is the p0117?
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Wednesday, August 21st, 2019 AT 12:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
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There is only one coolant sensor. I attached a picture for you to view the location.

Roy
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Wednesday, August 21st, 2019 AT 1:02 PM
Tiny
PACKERS27
  • MEMBER
  • 205 POSTS
I don't see it Roy.
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Wednesday, August 21st, 2019 AT 1:38 PM
Tiny
ASEMASTER6371
  • MECHANIC
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It is at the very back of the motor by the firewall by the diagram.

If not, please give me the complete VIN number.

Roy
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Wednesday, August 21st, 2019 AT 1:39 PM
Tiny
PACKERS27
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I found it. It wasn't on the thermostat housing but it was nearby.
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Wednesday, August 21st, 2019 AT 5:16 PM
Tiny
ASEMASTER6371
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Good deal.

Roy
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Thursday, August 22nd, 2019 AT 2:12 AM

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