Question about 2000 Ford Focus

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I want to put some r13a into the a/c system.. How do I determine the high pressure side?

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Above the front passenger wheelwell the valve sits on top of the accumulator,when you fill must do like brail.

The port is located behind the front passenger side wheel well. There is an illustrated walkthrough on focushacks.com

Posted on Jun 27, 2009

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On an ac system how do i check the high & low preasure switches and what do these switches operate and what is the purpose of them?


If your 2003 Impala had a low pressure switch it would shut off the compressor if the low side pressure got to low. This would indicate that there is not enough refrigerant in the system an therefore not enough oil flow through the compressor so the compressor is shut down.

The high pressure switch, if your impala had one, would turn on the fan once the a/c pressure on the high side reached a certain pressure.

Switches are just that, they are either on or off. A low pressure is normally on and a high pressure is normally off (this can vary greatly depending on the car).

Your impala uses a pressure sensor. The sensor reports actual pressure data to the PCM which combines info from other sensor to determine what should be turned on and when.

Hope that helps. If you have any questions let me know and I'll see if I can answer them for you.

Oct 09, 2011 | 2003 Chevrolet Impala

2 Answers

Add freon to 2003 audi A8...any special tools needed? I have gauge and equipment but system will not take freon on the high side.


NEVER attempt to add freon on the HIGH side...This is very dangerous and can result in injury and damge to the system! The correct set of AC manifold gauges are needed to monitor pressures and determine the overall condition of the system...Refrigerants should be added by trained refrigeration technicians.

Jul 16, 2011 | 2003 Audi A8

1 Answer

Where can i find the Low pressure switch on my 92 nissan pathfinder. and how can i check to see if its bad or switch it on?


The low pressure switch in an A/C system cannot be manually "switched" on or off.
most A/C systems have 2 switches. Both of these switches are "switched" by the pressure of the freon in the system.
One is located on the high side of the system, and the other is on the low side of the system. The one located on the high side is a normally closed switch that opens the A/C clutch circuit and shuts the compressor off when the high side pressure gets dangerously high - usually around 350 - 400 PSI. This keeps you from having an explosion in the event that the hoses become restricted for any number of possible reasons.
The low pressure switch opens the A/C clutch circuit and shuts the compressor off when there is not enough pressure on the low side of the system to safely operate the system. usually somewhere around 20 PSI. The compressor is oiled by oil circulating along with the freon in the system. If the freon leaks out, the pressure drops and the oil cannot circulate because there is not enough freon to push it through the system. So the low pressure switch shuts the compressor off to keep the compressor from blowing up due to oil starvation.
Failure of these switches is very rare. Almost every one that I have replaced was not because the switch didn't switch, but because it was leaking freon.
If your low pressure switch is keeping your A/C compressor from running, it is most likely that the system is either out of freon (due to a leak somewhere in the system) or because it is unplugged.
Your Nissan is equipped with a "Dual Pressure" switch. it does the job of both switches by opening under extremely high pressure as well as extremely low pressure conditions. it is located beween the front grill and the A/C condensor near the Accumulator just to the right (as you are facing the front of the car) of the right headlamp area. See picture.50e4218.gif To determine if this switch is functioning properly, you must hook-up an A/C pressure manifold gauge (to find out what the actual system pressure is) and use a volt/ohm meter to determine if the switch is opening and closing under the correct pressures.

Oct 10, 2009 | 1992 Nissan Pathfinder

1 Answer

Air condition blows hot air but it has freon


You may have created an over charged condition and at this point the a/c compressor will cut off on high head pressures. This can be verified by installing gauges to the systems high and low side service taps and reading the pressures.An overcharged system will start the compressor briefly but soon cuts off once pressure goes to 350 - 400 lbs on the high side. Acceptable pressures for this system should be no greater than 250 high and low suction should drop to 40-50 psi.You might recover the charge and evacuate the system,then try bringing the charge back to proper level.A sight glass in the reciever drier really helps determining proper fill.Once all bubbles have dissipated from the sight glass during charging ,one should stop at that point to avoid overfilling.Too much freon is worse than a low charge especially in hot ambient conditions....

Aug 26, 2009 | 2003 Saturn ION

1 Answer

AC compressor clutch is cutting on and off steadily during compressor operation.Is this clutch or clutch coil?I was pushing buttons on electronic climate control,and suddenly AC stopped working,only have...


You have to start by testing the pressure in the system. If it was cycling a lot and then quit it sounds like you developed a leak somewhere and once it fell below the low pressure switch it will not come on.

The system works with a high and low pressure switch that will cut out if the pressure is too high or low. When the system looses pressure it will fall below the low while running, turning off the compressor, When the compressor is off the high side and low side equalize out bringing the stationary pressure above the low limit, turning the system on again. This cycle will repeat until there is not enough pressure when equalized to turn the system back on.

If the pressure is good, go next to the relay, it should be located on the fire wall. if the relay is right, then you need to determine if it is high or low pressure switch shutting it off. IF it is the high, you probably have a restriction in the system, You could also have a problem with the compressor. With the car not running manually turn the clutch and see how much play, smell the area and smell if there is a burnt odor, then try to turn the armature that goes into the compressor. see if it is frozen.

Aug 16, 2009 | 1992 Cadillac DeVille

2 Answers

AC not cooling for 97 Passat TDI


A/c should be charged on the low side while engine is running. Make sure high side valve is turned off. Low side reading should be around 32-35 psi at idle high side should not go above 250. I hope this helps,good luck

Aug 01, 2009 | 1999 Volkswagen Passat

1 Answer

A/c for honda 2000 blows cold but has erratic high pressure readings very high and very low readings on low side


evacuate system and refill to proper spec for r13a refridgent may not have proper levels. check cooling fan opperation with engine running cooling fan should be opperating while a/c compressor is engaged. if all theese check out good has blockage in system

Jul 31, 2009 | 2000 Honda Civic

2 Answers

Low-pressure port I need identification


Basic AC system consists of Compressor pump (on engine), Condenser (front grill with radiator) and Evaporator (Firewall). Pump has two ports output (high pressure) and return (low pressure). Follow lines from pump. High side is usually between pump and condenser. Follow lines and find second port this will be low side (refill) port. Paint or replace port caps (red high, blue low). Also, refrigerant in system determines port size (R12 or R34).

Jun 24, 2009 | 2001 Chevrolet Malibu

1 Answer

2000 new beetle


at 20psi you only have enough refrigerant to keep it running,
1) how long ago did you last have it working as you Dont want to keep charging the system as its still a green house gas.

2) do you hear a click when you turn the a/c on and some cars the revs pic up

3)are they ok,if not seek proper help or you will cost you more in the long run

top up the gas pressure slowly up to 45 psi, let the system settle down, slowly top up to 50~60 psi

(depends on the temperure out side and in side the car as the propper gas pressure is determined by the high pressue)

the pipe should be getting cold,maybe a slight frosting, dont try and get to much ice on it as you could nacker the pump.

Dec 30, 2008 | 2001 Volkswagen Beetle

1 Answer

Air conditioning system


low pressure port is smaller than the high pressure side

Jul 16, 2008 | 1990 Toyota Camry

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