Low side ac cap

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How To Find a Low Side Service Port

low side service port

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So your vehicle’s AC system is blowing hot air and you are ready to add some refrigerant, but where do you begin?

The first step in recharging your system is to locate the low side service port (or low-pressure port). Every auto air conditioning system has two service ports: one on the high pressure and one on the low pressure side. When recharging with AC Avalanche refrigerant, for safety, you will charge through the low side service port.  Never charge through the high side port.

 

 

 

ac compressor

So, how do you find the low side service port?

Well, it’s usually located between the compressor and the evaporator on the larger diameter a/c line. First, find the compressor. It is driven by the fan belt near the radiator at the front of the vehicle. Here is what a typical auto a/c compressor looks like:

 

 

If you are having trouble identifying your compressor, you might want to try visiting this page and entering your vehicle information to see a list of compatible compressors for your engine:

http://www.autozone.com/cooling-heating-and-climate-control/a-c-compressor?filterByKeyWord=compressor&fromString=search&isIgnoreVehicle=false&newYmme=true

 

Next, follow the line from the compressor towards the evaporator. The evaporator is located near the firewall behind the dash, and directly under the windshield. The low side service port is usually in this line and will have a black or blue plastic cap that needs to be removed.  On some vehicles, the service port is directly on the compressor.   To make things easier, this is the only port to which the Avalanche quick coupler will connect.

Now that you know where your low-side service port is located, you can begin recharging your systems refrigerant according to the instructions on the packaging. To summarize:

  • Every A/C System has two service ports: A high side and a low side.
  • When recharging with AC Avalanche, you will only use the low side service port.
  • The low side line of the system will have a larger diameter metal pipe than the high-side.
  • The low side service port is usually located between the AC compressor and evaporator.
  • The low side service port will have a black or blue plastic cap that needs to be removed.
  • The low side service port is the only port to which the AC Avalanche coupler will connect.
  • Never charge through the high side port.
Sours: https://www.acavalanche.com/low-side-service-port/

PT Cruiser Forum

DefaultRe: AC low pressure port: missing cap?

I'm no expert but have worked on my wife's AC with my brother, the mechanic's, help.

Yes it should have a cap. They're really just to keep dirt out of the system. Replacement caps should be available at auto parts stores. The high pressure and low pressure ports are different sizes to prevent mix-ups in connection.

If the system has no pressure in it at all, I wouldn't bother recharging. It needs the leak fixed, system evacuated to remove any air & moisture, and then recharged. The system probably has pressure in it if it blows cool air at some point.

If the system has some pressure in it, you could try a recharge. My PT is an '01. I never had the AC system serviced and it still works fine. So, if your system's low on pressure, it has a leak. The question becomes how long a recharge will last.

DO NOT use AC system sealers. AC systems have lots of small passages that the sealer gunks up. My brother explained that the sealers either cause the system to fail or work poorly. I've read that shops will not service systems that have been loaded with sealer as the sealer messes up the shop's very expensive AC equipment. Only put refrigerant, pure R134, in the system.


Last edited by RickinPA; 25 May 2018 at 07:39 pm.

Sours: http://www.ptcruiserlinks.com/forum/
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Although many techs know (or suspect) this, it may surprise DIYers to know that service port caps are THE primary seal for  a  vehicle’s  A/C system’s service ports.   Many erroneously believe the Schrader valve provides the seal for the ports, but in fact the valve merely provides access to the system and still requires the cap to provide the seal.

When diagnosing a system, the first and most important step should always be to ensure that the service port caps are in place and properly installed (with O-ring inside and tightly screwed on).  Likewise, it is imperative the cap is properly replaced after servicing the system to ensure the charge is held (assuming there are no other system leaks).

This needn’t only be checked when performing A/C service.  Routine inspections to confirm the service port caps are in place is good practice.  If one or both is missing in a customer’s vehicle or your own, you should install new caps.  This will help to prevent refrigerant leakage and also help keep the A/C system performing at optimal performance by preventing debris and rain entering and damaging the system.

FJC offers high and low side service port caps—Part #s 2614 and 2615.  Every shop should have an adequate supply on hand.

LMK 2019

 

Tagged on: high side    low side    seal    service port caps

Lynne KlosowskiBlog

Sours: https://fjcinc.com/service-port-caps-small-but-powerful/

Ac cap side low

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GM AC high pressure valve failure

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