cooler refrigerant

Old car was filled with refrigerant 134a+ by DIY to save cost. However, it did not work ever the pressure is 45 psi. Last year, body shop did for me. It worked.
I read the instructions of th refrigerant. It said that shake of the can is necesasry before filling. But, I did not do shaking. Is this a reason for the problem. Thanks

所有跟帖： 

• 吃多了撐的,normal pressure should be 回複：cooler refrigerant -fixanycars- ♀ (68 bytes) () 06/24/2009 postreply 11:59:01

• RE: cooler refrigerant -biglow- ♂ (392 bytes) () 06/24/2009 postreply 12:10:39

• 回複：Suggestions -changjing- ♀ (208 bytes) () 06/24/2009 postreply 16:14:50

• Release R134a or R12 on purpose is Federal violation -biglow- ♂ (0 bytes) () 06/24/2009 postreply 20:27:47

• 壓力是正常範圍，看看壓縮機是否engage。如果你的壓縮機是單獨 -修volvo- ♂ (30 bytes) () 06/25/2009 postreply 12:27:37

• 回複：Thanks for your instructions -changjing- ♀ (0 bytes) () 06/26/2009 postreply 10:35:17