Rpm NOT coming up with AC

[thebus]

Just tried it this evening figuring before it got really hot..well hit the good old AC button but nothing..no change in rpm no cool air..parked it and I can physically spin the front most part of the compressor. Any ideas? This was my luxury compared to the 55! Everyone have a great memorial weekend!

 

[Tools R Us]

Does it have any Freon in it?

 

[inkpot]

Is the belt tight?

 

[thebus]

Belt seems tight. I’m going to assume it has Freon in it. But I will plug in a gauge and check. Also no overheating of truck temp was at 190

 

[MDJ]

Before you check pressures, make sure the compressor clutch is engaging.

 

[thebus]

It seems it is not. Hence no rpm change

 

[ceylonfj40nut]

You can run a lead directly from the battery to see if the clutch engages. If it does it could be a wiring issue from dash to ac compressor. Low Freon could also be the cause.

 

[leonard_nemoy]

I don't know about the 80 but most vehicles have a low pressure switch on the AC system that won't allow the compressor to start if the freon is low. Like others have said start by checking the freon

 

[thebus]

Out of gas thanks guys did not know it has a low pressure switch!

 

[MDJ]

I didn't realize that either. Good to know.