1999 F350 A/C problems NEED HELP PLEASE

[ngaspard]

I have a 1999 F350 and the A/C will only blow through the defrost vents and it also will not kick the compressor on but if i jump out the compressor it works fine but since the air flow will not change it freezes up can some one help me please

[DrewGerhan]

Check down on the passenger side under the glove box. There should be a set of vacuum lines that come through the firewall. Those were disconnected on mine and cause only my defrost vents to work.

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[ngaspard]

i have 2 vacuum lines there and the look to be plugged in but i will check them again but will that also cause the switch not to turn the compressor on

[lug]

Check your freon pressure level. No or very low freon will not allow the compressor to engage thanks to switches in the system which cut power to the compressor to prevent failure. The Defrost only setting means you are not getting vacuum from a source to operate the vacuum solenoids. Defrost is a default no vacuum setting. Check the fuses, vacuum pump, reservoir, hoses and finally the selector switch.

[Lawerence]

Try removing the clutch and take out the washer and put it back on. My act would not engage until i removed my washer then it worked great. All the shops said I had a bad compresor and it was that stupid spacing the whole time.