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high pressure side reading very high, low pressure side reading is low/normalish

camosilver on Fri July 23, 2010 3:47 PM User is offline

Year: 2001
Make: oldsmobile
Model: alero
Engine Size: 2.4
Refrigerant Type: r134
Ambient Temp: 90
Pressure Low: 30
Pressure High: 400
Country of Origin: United States

i just bought an 01 alero with the 2.4l twin cam motor. the ac compressor was not coming on so i hooked up my gauges and the low side was around 20 and the high side was around 350 or so (just going from memory, this was a few days ago). ambient temp was around 90. i added some r134a from my 30lb tank and the compressor clicked on and i stopped charging it at around 30 on the low side because the high side was around 400, way too high. it wasn't blowing cold/cool at all at this point either.

what type of problem does this indicate?

Dave in Texas on Fri July 23, 2010 7:49 PM User is offlineView users profile

Could be a sign of air or moisture in the system. I'd evacuate and make sure it holds vacuum before recharging.

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At 2, I went home with a 10. At 10 I woke up with a 2 !!

1stbscout on Sat July 24, 2010 2:49 PM User is offlineView users profile

If you have pressure in the system as you stated before you started something is plugged and holding the pressure in the high side. I would start by recovering the refrigerant and removing the expansion tube and inspecting it for trash.

camosilver on Mon July 26, 2010 6:08 PM User is offline

Quote
Originally posted by: 1stbscout
If you have pressure in the system as you stated before you started something is plugged and holding the pressure in the high side. I would start by recovering the refrigerant and removing the expansion tube and inspecting it for trash.

i feel kinda stupid, but the problem was my gauges. i must have dropped my gauges or something because with no pressure in the high pressure side line of the gauges, i was reading around 350. so when it was reading 400, in reality it was only 50. i fiddled with the needle and set it to zero again, charged the system and everything is working perfectly.

GM Tech on Mon July 26, 2010 6:31 PM User is offline

Except for your original problem--- yo have a leak- that needs to be found fixed and evacuated and recharged to factory spec.

Would you fix your flat tire by adding air? Some people don't mind adding air (or refrigerant) every other week---so be it- if you think it's fixed you in your own mind are happy....Many a mechanic tries to do the same as you-- but they get caught and told to fix it right! by an unhappy owner.

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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 Tue July 27, 2010 7:42 AM User is offlineView users profile

As GM Tech stated, find and fix your leak, then recharge the system properly, you need to pull a good vacuum, make sure it holds and then charge the exact amount back into the vacuum..Do it right and you'll do it once...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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