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New Compressor, not cooling as well after 3 days

knightgang on Sun August 02, 2009 2:50 PM User is offline

Year: 1997
Make: Olds
Model: Cutlass Supreme
Engine Size: 3.1
Refrigerant Type: 134a
Ambient Temp: 88
Pressure Low: 43
Pressure High: 225

Okay, this past Thursday night I installed a Remaned V-5 Compressor, new accumulator and a new OT on this car. Flushed, Pulled a vacuum and recharged with 2.5 12 oz cans of 134a. System calls for 8oz oil and 30 oz 134. Ambient temp once repairs were complete was about 75 deg and after charging pressures were roughly 37low/210 high. That night I was pulling vents temps as low as 35 deg while driving.

Today, the lowest vent temps pulled were about 55deg and when I got home, pressure were as posted above. The only other thing I can say is that most times upon deceleration I hear a sound under the dash that sounds like something is spitting into the blower fan. It almost sounds like when the evap backpressure builds on the low side due to the slowing of the compressor, that there is a blowby somewhere.

I have dye in my system and cannot find a leak anywhere (now that the compressor has been changed). Is it possible that this lack of cooling could be due to an inadequate vacuum and that there is air in the system. Could that cause the blowby/spitting sounds that I hear? Should I evacuate, revacuum and recharge or could there be another issue that I am overlooking.

Chick on Sun August 02, 2009 9:37 PM User is offlineView users profile

Check the evaporator drain, sounds like it was humid and the water draining off the evap is hitting the fan, does the vent temp drop when you lower the fan stetting? on max air? Only you know if you pulled a deep enough vacuum or got air in the system.. If unsure, do it again....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

knightgang on Sun August 02, 2009 9:41 PM User is offline

We are in South GA. Humid here all of the time. I will check the drain. This car did sit for about 18 months (although) and it is quite possible that the dust and dirt that settled has clogged the drain. I guess fixing the A/C during the hottest time if the year after such a long sit it was bound to have a clogged drain. Going to try to see about it tomorrow.

GM Tech on Mon August 03, 2009 9:01 AM User is offline

I've seen mud dobbers build nest in thedrains before--- also W cars use a nipple on end of drain tube-- I cut them all off to avoid your exact complaint-- no other GM cars use the nipple- and most all the condensate drain complaints I get are off of W cars-- you do the math.....

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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......

knightgang on Mon August 03, 2009 10:45 AM User is offline

I have not had a chance to get to that drain tube yet, but I will this afternoon. I assume that the build up of condensation in the airbox will affect the cooling ability. Is this correct?

knightgang on Mon August 03, 2009 6:42 PM User is offline

Pulled the Elbow on the Airbox drainand it was clogged with dirt. As mentioned, probably dirt dobbers having their fun. What seemed like about a gallon of water came pouring out of the evaporator box. Went for a test drive, vent temps got down to about 44 deg and when I pulled back in the drive, it only rose to about 48-50 deg sitting still in the drive.

It still seems like it should be a bit colder than that. My 2001 Chevy Silverado blows 35 deg while driving, and once it starts blowing that cold, it will stay below about 45-48 no matter the driving conditions.

I did check to be sure that both fans were running and they were, however the primary fan seemed to be pulling harder than the aux a/c fan.

I did not recheck the pressures. I guess now that the water is out of the evap box, I proably should because that may make a difference since it will be blowing cooler air back through the evap and not trying to cool the standing water in the box as well. It this thinking correct.

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