A/C doesn't work on idle

[NiWhat]

The A/C on my 1998 doesn't work on a idle, we tried bypassing both the high pressure and low pressure, but it still won't kick on when idling, it works fine when i'm driving it and on the road, any ideas?

 

[97__Z71]

My guess is the fan isn't moving enough air.

 

[Mysilvi]

Check your Batt voltage at Idle could be dropping below acceptable level and cuts out the compressor Or get an E-fan and clean the coil of any debri that may be stuck in there. Need to pull the heat out of the coil for effective cooling + have enough of a charge in the system. Good luck.

 

[Pierced]

Does it kick on if you give it some gas while its parked?

If the clutch is not engaging then its not an airflow issue and if its a voltage issue adding E-fans wont help.

My girlfirends trailblazer is doing the same thing at idle (like 900rpm) it disengages but if I idle it up to about 1500 rpm it kicks on and will freeze you out. Hers does it while driving or sitting still.

 

[NiWhat]

No it doesn't kick on in park, we brought the rpm up to 2000 and it still wouldn't, however i got someone to watch it while testing a few things, and it starts for about 2 seconds and then stops, and now i have zero idea why it is doing this.

 

[shelbyt.67]

To ask a stupid question. Have u checked yer fluid pressure. Everthing u described sounds like low pressure.

 

[Pierced]

That would be my next step as well to check the freon level.

 

[Mysilvi]

A common leak is right at the schrader cap. When you remove the low pressure side cap take and tighten the schader valve before you charge the system. I did have this problem and my compressor cut out on low charge/pressure. Good luck.