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bad expansion valve??

lonnys on Tue June 23, 2009 11:05 PM User is offline

Year: 1196
Make: Saturn
Model: SL1
Engine Size: 1.9
Refrigerant Type: 134a
Ambient Temp: 87
Pressure Low: 80
Pressure High: 110

no cooling at idle Great at about 3000rpm and higher.

at idle low is 80 high side is 110 at 3000 rpm low comes down to 60 high up to 150.

Would bad expansion valve cause this.

Chick on Wed June 24, 2009 6:46 AM User is offlineView users profile

More likely a low charge, or bad refrigerant control valve in the compressor, I would try having the system evacuated and properly recharged before going any further.. You won't get cooling with a 80psi low side....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Wed June 24, 2009 9:27 AM User is offline

Uhm-Errrr Sorry Chick--- must be too early.. I don't think Rotary Vanes used control valves, since they are not variable stroke compressors....

Gotta love those rotary vanes-- try the recharge to spec method- then pray it works better........

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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......

Chick on Wed June 24, 2009 10:11 AM User is offlineView users profile

GM Tech, I need four cups of coffee in the morning just to get my heart started... anyway, I have a couple on the shelf, and you are (as always) correct, that year did not have a control valve, the one on the shelf from 2000 to 02 does (has two of them) I must have answered that one on my first or second cup... The recharge does stand though...
thanks for the catch....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

lonnys on Wed June 24, 2009 12:18 PM User is offline

Did recharge last night. Can't tell any differance.


Repalced compressor last month with one from salvage yard. Old one blew a seal. And New rec.dry and expansion valve from oreillys.

bohica2xo on Wed June 24, 2009 4:00 PM User is offline

Saturn manual calls for 2000 engine RPM during pressure test.

@ 80f ambient:

180 to 215 psi High side

24 to 28 psi Low side


Hard to say with a junkyard compressor, but the high side is low for that temp. If you have a full charge, it should be closer to twice what you are showing...

GM Tech advises overcharging to "start" the pump, but I have never had this problem. You can try adding a 20% overcharge to see if it will work, but I suspect the pump should have stayed in the scrap car.

B.

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"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.

lonnys on Thu June 25, 2009 8:29 PM User is offline

added some more tonight. High went to 245 low was at 90. and its a cool 95 out.

Chick on Thu June 25, 2009 9:10 PM User is offlineView users profile

you didn't mention it so I'll ask, was a deep vacuum pulled and rehcarged into the vacuum??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

lonnys on Thu June 25, 2009 10:24 PM User is offline

yes pulled to 30 by my guage for bout 45 minutes

lonnys on Fri June 26, 2009 8:36 AM User is offline

What would be the best nex step? Should i evacuate and try to recharge. Or replace anything? As I should be off sunday I can put my full attention on this mater. Thanks.

Voyager97 on Fri June 26, 2009 9:24 AM User is offlineView users profile

I'm not familiar with the Saturn system (it's probably called something else here in the UK, if we have it) but,

IF it has an EPR (evaporator pressure regulator) AND the evap outlet pipe is warm, those pressures suggest the EPR is stuck closed.


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Vic @ Pennine AutoChill

lonnys on Thu July 02, 2009 10:22 PM User is offline

Since I already had it swapped out expansion valve today. Vacuumed for 1.5 hrs and recharged. Guess what. It didnt help. But figured that. Will be changing compressor and flushing this weekend I hope.

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