[00PSD1]

Hi guys

I rencently drove to Montana from San Diego CA my A/C and fan were working fine but when I arrived in MT my A/C stopped working and has not worked since what could be the problem? My truck has 60,0000 miles. Also when I turn the know from A/C to off it still makes the hissing sound. /ubbthreads/images/graemlins/shrug.gif

Thanks,
Andrew

 

[ReefBlue]

Could be a few things.

No 12v to the compressor.

A/C clutch coil shot

A/C clutch shot (just had mine replaced last week)


The hissing sound you're talking about is the vacuum. It is a normal sound whether or not the A/C works. The 'A/C switch' determines where the air comes out. It makes that hissing sound no matter what. Run your truck, turn it off and pull the key out. Keep switching the HVAC control switch and as you cycle past vent locations, you'll hear the hissing. Has nothing to do with A/C itself (unless of course the switch itself is bad and preventing 12v to go to the compressor).

 

[SuperDutyFiver]

Maybe you'll get lucky, I've seen this a few times in the spring:

Try unplugging the connector on the top of the compressor-spray it with some silicone spray and plug it back together...

 

[jimmyendicott]

You might want to hook up a set of gauges to see what kind of pressure you are running. If it is above 40 psi on the low side and above 350 on the high side, I would say it is time to have the a/c re-serviced. You could possibly have a little air in the system if you have a leak. I should run around 20 on the low side and 300 on the high side. This is just a guess. If there is a air-conditioner expert out there, lend a hand.

 

[fulltimer50]

Be sure the fuses are seated in the fuse holder tight. /ubbthreads/images/graemlins/shrug.gif