Air conditioning not working properly

NINASMITH1

MEMBER
2001 CHEVROLET 1500
V8
2WD
AUTOMATIC
133,000 MILES

Truck listed above is a Silverado. Air conditioning has not been operated for many years. System has no Freon in it, 134A.
Attempted to push air out of system with refrigerant before charging. Slowly charged system. Ambient air at 76 F. Suction pressure at 30 pounds approximately. Discharge Pressure at 190 pounds approximately. Inlet evaporator suction line cold. Outlet evaporator suction line is warm. Discharge air at interior 70 F approximately.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

I suspect you have either a leak allowing air in/Freon out or the system or you have moisture in there. Unfortunately, trying to push air out with the Freon will just not give great performance.

Either way, we need to pull it down into a vacuum and see how long it holds. It should hold it for a long time but we need to make sure it can for at least an hour.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

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