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Low Side VERY High, High side kinda high

JimXtreme on Wed June 09, 2010 9:48 AM User is offlineView users profile

Year: 2007
Make: Ford
Model: Fusion
Engine Size: 2.3
Refrigerant Type: R-134
Pressure Low: 350 psi
Pressure High: 125 psi
Country of Origin: United States

Sitting Static or Car running, A/C turned on, compressor NOT engaged and low side reading 350 psi with 125 psi on the High Side.

Nothing was done to the A/C system, ever...this is the first time there has been a problem.

Any ideas why?

GM Tech on Wed June 09, 2010 9:55 AM User is offline

Impossible!!! Your low side gage only goes up to 140 or so-even when pegged--plus it would normally equalize when static readings are taken.

Re- evaluate your readings....you probably have 125 on both sides--statically

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

HVargas on Wed June 09, 2010 12:03 PM User is offlineView users profile

As GM Tech stated, it is impossible to read that high of a low side pressure. What was the reason for initially installing the gauges onto the system? Depending on ambient temperature, 125 is a good static pressure and I would suspect the system is full or very close to. Is the A/C not functioning or were you just putting the gauges on to check the pressures. What are the pressures with the compressor engaged?

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JimXtreme on Wed June 09, 2010 12:56 PM User is offlineView users profile

Do you see the 350 right after the 120 on the Gauge below?






Edited: Wed June 09, 2010 at 12:57 PM by JimXtreme

JimXtreme on Wed June 09, 2010 12:57 PM User is offlineView users profile

Quote
Originally posted by: [email protected]
As GM Tech stated, it is impossible to read that high of a low side pressure. What was the reason for initially installing the gauges onto the system? Depending on ambient temperature, 125 is a good static pressure and I would suspect the system is full or very close to. Is the A/C not functioning or were you just putting the gauges on to check the pressures. What are the pressures with the compressor engaged?


and as I stated above....Quote
Sitting Static or Car running, A/C turned on, compressor NOT engaged
The A/C won't come on so I hooked the gauges up and got the reading I mentioned.

Edited: Wed June 09, 2010 at 12:59 PM by JimXtreme

bohica2xo on Wed June 09, 2010 2:33 PM User is offline

Well, if in fact you have 350 psi stacked up in the low side - just wait for a warm day. The evaporator will burst shortly. Must have welded the suction line shut someplace. Has the vehicle been in an accident?

That area of the gauge used to be marked "Retard" but I guess the PC police did not understand that meant to retard the gauge from striking the stop. The pressure range past 120 on that gauge is in no way meaningful.

Best guess is you have some refrigerant in the system, and the compressor is not turning on because of the ECM. Try resetting things by removing the battery ground for a half hour.

B.


-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

GM Tech on Wed June 09, 2010 3:21 PM User is offline

Bottom line is, you can't create that high of suction pressure- and like bohica said- the retard was always printed on the gage face- yours is missing it-- it means this is not linear in this area and it is there for those who accidently open both gage valves and discharge pressure flows into suction gage and it keeps the gage from destroying itself up against the stop. In no way is it meaniful past 120psi.

Do some electrical diagnosis and find out why your compressor is not engaging.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

JimXtreme on Wed June 09, 2010 10:36 PM User is offlineView users profile

I'll get it back soon... the owners manual was missing so I had no legend for the fuse box. I wanted to check the fuses, relay, etc.

I'll check, do some trouble shooting andf post agin as soon as i have something...Thanks everyone

Denniswpb on Sun June 20, 2010 10:51 PM User is offline

Jim,

Please help me out!!! I'm having basically the same problem with my daughters 1998 Saturn SC2. No cold air, with vehicle running 155 PSI High Side and 50 PSI Low Side. With vehicle turned off, High Side remains at 155 PSI but the Low Side rapidly climbs and pegs out the gauge. I turn the car back on, and the Low Side goes back to 50 PSI and still no cold air.

Looks like the compressor is working, but I'm thinking now the expansion valve is clogged or bad. What did you find on your vehicle that caused the Low Side to peg out?

Edited: Sun June 20, 2010 at 10:55 PM by Denniswpb

Denniswpb on Wed June 23, 2010 11:10 PM User is offline

I replaced the expansion valve and the a/c is blowing really cold...

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