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AC not working new condensor, orfice tube, accumulator and compressor

penningp on Tue July 03, 2012 12:40 PM User is offline

Year: 1996
Make: Chevy
Model: K3500
Engine Size: 6.5L
Refrigerant Type: R134A
Ambient Temp: 95
Pressure Low: 45
Pressure High: 300
Country of Origin: United States

Hello all,

Been a long time since I have posted - gotta new problem I need help with :

I just rebuilt my AC system in my 1996 Chevy K3500 Silverado Dually. I added a new compressor (old one blew a front seal), new condensor, new accumulator and orfice tube.

I vaccumed the system and added the required amount of freon. Conmpressor stays on but the new accumulator is not getting cold in fact the only place the tubing is getting cold is just out of the new condensor - there it gets really cold but that cold never gets to the evaparator and accumulator.

Seems to me there is a restriction in the metal line that goes from the condensor to the evaparator but I have checked it and there are no kinks.

I am at a loss - any suggestions?



mk378 on Tue July 03, 2012 2:20 PM User is offline

It appears that yhe new condenser came with an orifice tube in it. You can't run with two orifice tubes; remove one of them.

70monte on Tue July 03, 2012 4:35 PM User is offline

I would agree with mk378. When I redid the systems on both of my 98 chevy trucks, both of the replacement condensor's came with a new OT installed. I almost didn't catch this when I repaired the first truck. It's an easy thing to miss.


GM Tech on Tue July 03, 2012 6:20 PM User is offline

That would hold true IFFFF it were a suburban-- there isno place for a second OT in a Dually...

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......

penningp on Thu July 05, 2012 12:38 PM User is offline

penningp on Thu July 05, 2012 12:39 PM User is offline

Guys - I can gaurantee that there is only one orfice tube in the system. Could I have added the oil to the wrong side of the accumulator and it plugged up the evaporator upon recharge?

Dougflas on Thu July 05, 2012 8:06 PM User is offline

Did you accidentally put the orfice tube in reverse?

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