A/C Problem

I have a 1998 1500 Silverado with 5.0 liter. When I push the a/c button the light on the recycle comes on also, even when its not pressed. The
compressor comes on for a few seconds then shuts off. It does it repeatedly with no cold air coming from the vents. The compressor does the same thing when I use any setting past the floor setting.
Sid
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Sounds like you have a leak / need a charge. The compressor has a pressure switch which keeps the A/C compressor clutch from engaging when pressure is low, to prevent compressor damage. The main symptom is just as you noted - or, in the case of *really* low pressure, the clutch won't engage at all.
- Larry A.

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I bought some 134a as recommended. I just want to make sure I'm doing this right. There are 2 connectors on the top, close to the compressor, is one of them where I recharge system?
Sid
wrote: | | >I have a 1998 1500 Silverado with 5.0 liter. When I push the a/c button the | >light on the recycle comes on also, even when its not pressed. The | >compressor comes on for a few seconds then shuts off. It does it repeatedly | >with no cold air coming from the vents. The compressor does the same thing | >when I use any setting past the floor setting. | > | > | >Sid | > |
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Not familiar with your model, but you want to charge the LOW pressure fitting. Buy a Haynes manual if you're not sure. Run the A/C while you are doing it; if this is indeed the problem, after a can or so, the clutch should start picking up and the A/C pipes under the hood should get cold/frosty.
Bear in mind that this does not address the issue of why your 134a leaked out. Typically this is dried-up seals in the compressor, from not being run enough in northern climates. This would require a compressor replacement. Just adding refrigerant is only a temporary fix, and will be satisfactory only in the event of a VERY slow leak. But you may get lucky!
- Larry A.

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I will give it a try. Thanks Sid
wrote: | >| | >| >I have a 1998 1500 Silverado with 5.0 liter. When I push the a/c button | >the | >| >light on the recycle comes on also, even when its not pressed. The | >| >compressor comes on for a few seconds then shuts off. It does it | >repeatedly | >| >with no cold air coming from the vents. The compressor does the same | >thing | >| >when I use any setting past the floor setting. | >| > | >| > | >| >Sid | >| > | >| | > | |
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I believe the low side is the side that goes from the condenser to the evaporator, for non techies. the thing in front of the radiator into the firewall.
wrote:

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The line going from the condensor outlet to the evaporator inlet is the high side of the system. The evaporator outlet to the dryer/accumulator, then to the compressor is the low side.
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What are the 2 inlets near the compressor?
| >I believe the low side is the side that goes from the condenser to the | >evaporator, for non techies. the thing in front of the radiator into the | >firewall. | | The line going from the condensor outlet to the evaporator inlet is the high | side of the system. The evaporator outlet to the dryer/accumulator, then to | the compressor is the low side. | |
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Sid, if you mean the inlets connected to the lines going to the compressor, one is the low pressure freon coming in from the evaporator. The other is hot high pressure freon going out to the condensor in front of your radiator. Best I can do without seeing your car.
Garrett Fulton
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