Question about 2001 Pontiac Sunfire

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01 sunfire ac. low side max out, and high side max out in pressure. What's wrong. No cold air inside. changed out orfice valve. vaccumed sys. down. recharged, but still does it.

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6ya6ya
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Posted on Jan 02, 2017

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  • 397 Answers

SOURCE: How can I charge the AC system is possible to install a low pressure valve?

This website has all the information you need including videos:
http://www.id-usa.com/how_to.asp
I just sorted out the aircon on my wifes Pontiac using the info here.

Posted on Aug 28, 2008

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SOURCE: Looking To Recharge The AC in a 2002 Pontiac Montana

the low port is between the engine and the radiator support and the high pressure port is by the cruise controll module

Posted on Sep 10, 2008

  • 1 Answer

SOURCE: 97 grand am low pressure port to recharge

The low pressure port is on the compressor on the bottom side. It should have a black cap on it.

Posted on Nov 03, 2008

tebot
  • 15 Answers

SOURCE: Locating low pressure valve on 96 explorer for ac recharge

The largest diameter line is the suction which is low. The small one that runs to a coil by radiator is high pressure. If there is no cooling then you may have air in the system which means a leak must be fixed first. Are you sure the compressor is engaging? You should hear it click and the engine bog down a little.

Posted on Mar 30, 2009

VWdan
  • 114 Answers

SOURCE: Where is the AC Low pressure valve on a 1999 Pontiac Grand Prix?

sometimes its behind the alternator real close to the firewall. Find the bigger of the two hoses and pipes the low side is always bigger. Also the cap is blue and the fitting for the charging can will only fit on the right valve.

Posted on Apr 24, 2009

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1 Answer

I am having problem with the A/C on my 2000 BMW 323i. I just Changed the Compressor, Drier, Expansion valve. In march I changed all the lines high/low pressure lines and also changed the Drier as well....


The pressure sw. on the dryer maybe weak but the way you explain it I think the sys is low on Freon. The reason for this is you said it did not get that cold. I would add a half can or one to the sys and see if the compressor cycles longer. Hope this helps.

Apr 26, 2017 | 2000 BMW 3 Series

1 Answer

98 expedition with dual air. pressures were 50 and 225 at idle at 90 - 95 deg outside. Compressor cycled and air got warm when driving. Added 12 OZ of freon. pressures went 60 and 250. added another can...


sounds like the expansion valve or the orfice may be clogged is your compressor making noise like a clinging inside if it isyou'l need to change the accumlator dryer as well as expansion or orfice along with the compressor. you could try what are the pressures with a fan in front of the vehicle if they go to 35-40 psi on low side and 200-250 psi on high side these are close to where they should be.

Jul 07, 2012 | 1998 Ford Expedition

1 Answer

The blower works on my 1998 Ford Escort but the air conditioning does not get cold. How do I know if it just need freon or if it is the compressor?


does the a/c get cool but not cold? if so then may just need some freon. check the low pressure side with the engine idling and blower set to high and on MAX a/c. the low pressure side should read between 35-45 psi , if it is lower than 35 then add 1 can of freon to see if pressure comes up , if it doesn't then you may have a weak compressor or a clogged orfice tube. but if the air is hot and not even cool the you may have a bad comprossor clutch, check to see if it is coming on.

Jul 27, 2011 | 1998 Ford Escort

1 Answer

Air Condition not very cold.


The pressure on the low side it not very meaningful by itself.
What matters is the difference between the high and low.
The low normally can be up to 120 psi or so, and the high side can be twice that.
But when the AC is running, the low side should drop to less than when it is off.
But there could be lots of reasons for it not being very cold.
The pump clutch could be failing to engage. The release valve should be not opening. The air flaps could be letting heater air in instead of cold. The AC condenser fan fan or relay could be bad.
Etc.

Jul 10, 2010 | 2002 Pontiac Sunfire

2 Answers

AC not cooling


You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

Sep 03, 2009 | 1995 Geo Prizm

1 Answer

Check engine light and air conditioning


I Think I Can,
You Might Be Blending Hot Air With A/C Cold Air And Being 100Deg Outside, Your Getting
Really Warm/Hot Air Inside,
Your System Is Charged w/Freon, The A/C Compressor Is On/Engaged,
There Are 2-Aluminum Tubes Comming From The Compressor, [In & Out Pressure]
1 Tube Will Goto The Front Condensor, Infront Of The Raidator,
The OTHER Tube Comming Out Of The Condensor Will Goto A Dryer,
[Aluminum Looking Cylinder] Bigger Aluminum Tube[s]
The DRYER Will Then Feed Freon To Your Evap-Coil Inside Your Car [Cool-Air],

OK, The Dryer Tube's, 1 Of Them Should Be Cool/Cold, Locate That Tube, A Thermometer
wrapped w/Alum-Foil Around This Tube,
A/C ON, [A/C Compressor Engaged]
If You See The Temp Is Around 50-55 Degree's Or Lower, You Have Cold Air,
If Not, Above That, Low Freon, Or A restriction In The System. [Comes Later]
You Have Cold Air, You Have Warm/Hot Air Inside Car/Vents?
You Are Blending Hot Air w/Cold A/C Air, Problem Is With Heater-A/C Blend Box
Under Dash. There Are 2 Seperate Coils Under The Dash,
1 For Winter/Heat, Other [Evaporator Coil] For A/C, There Is a Diverter/Flapper door
That, For A/C, Closes Off The Heater Coil, Or It Should, To Prevent Engine Hot Water/Heat
From Blending w/ Cold A/C Air.
Most Are Controlled By A Diaphram, Vaccum Controlled From The Heater-A/C Controller
On The Dash.
If You Can Select From Defrost Vent To Dash and Floor Vents, Most Likely you Have
a Bad Diaphram That Controls The Heat-A/C Flapper Valve.
Most Time's You Can Open/Remove The Glove Box And See It,
A Temp Fix, For Cold Air, Would Be Remove The Vaccum Line From That Diaphram,
And Plug It, Pull The Metal Rod Back On The Diaphram with a Needle Nose Pliers,
If you Get Cold Air, Take a Ty-Wrap, Around The Shaft, Secure It, To Keep The
Vent In The Cold Air Position.
Then You Will Have To Get A New Diaphram Installed, Most Time's, Can Be Done
Through The Glove Box Opening.

Now About The Restriction In A System,
You Will Need A Set Of A/C Gauges, Car-Off, A/C Off, Connect Gauges.
IMPORTANT: The Gauges Before Connecting Should Show Pressure In Them [Freon]
Either The Gauges Have Freon In Them Or They Are In A Vaccum.
Otherwise They Have Air In Them, Air w/Freon=BAD Things.
OK, Gauges Show Pressure, Gauges Not Connected To Anything,
Open Up Both Knob's, Blue [Low-Side], Red [High-Side]
Gauges Needles will Move/Equal Out pressure,
BOTH Gauges Should Read Same Pressure, If Not, Quick Fix, Remove Gauge Glass
Covers, Need Little Screwdriver, If Gauges Off By ie: 4 psig,
Adjsut Low-Side [Blue] By 2psig and other, by 2psig, [Split The Difference]
So Now Both Gauges Read IDENTICAL Pressure.
Close Both Valves, Blue & Red
Connect Gauges To Car, Car=Off, A-C=Off
You Will See Pressure On Both Gauges,
Low Side Shuld Be Around 75-95psig, Depending on Outside Temp, If Around 60 or less
need freon.
OK, BOTH Gauges Should Show SAME Pressure reading,
If There Is MORE Than a 4psig Difference Between Them,
There Is A restriction In The System,
a Plugged "Orfice Tube" [Filter] Part Cost $3.00, Servicing The Filter, Alot More.
Restriction Causing Might Be , Moisture/Air in System [Improper Vaccum On System During Last Repairs], Compressor Breaking Down [Metal, Black Goo Bul-up]

Hope You Get Some Cold Air Soon.

Jun 25, 2009 | 1999 Mazda Millenia

1 Answer

Air conditioning low pressure sensor


find the sensor that is plugged into the accumulator on passenger side normally it Will have two wires the dryer will be silver or aluminum colored unhook the connector put a paper clip in the connector if the compressor comes on then you have it, Warning if low on refrigerant you can damage the compressor if on for a long period of time, check to see if AC gets cold turn it on to Max AC fan full blast and see it it's cold, if it is the switch is bad, if it does not get cold then it needs to be serviced.

Jun 25, 2009 | 2001 Chevrolet Malibu

1 Answer

A/c problem


Why did you change compressor? If for failure, or even just changed because not cold, did you flush out entire system? Compressor failure can lead to a clog in the high pressure line. The low pressure line will usually become very cold-may even ice up- but the receiver/dryer will not be very cold to touch. Monitor your head pressure and make sure your pulling less than 25 lbs. on low side 75 F ambient. High side should not exceed 300 lbs.
Charge weights should also be exact as overcharge has same results as undercharge-hot air. If all is good under hood and head pressures o.k., look for debris build up on evaporator core in air box under dash, clean as required. Also make sure blend door is closing properly and heat is not staying on.

Hope this helps.

Jun 12, 2008 | 2001 Ford Windstar

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