AC questions

[Claytona08]

I have a 84 C10 and the air hadn't worked since I bought the truck several months back. I bought a kit to convert it to the 134 coolant. I cranked the truck and turned the air on max. Nothing happened. When I turned the air on high it would blow hard but no cool air. I'm confused on why nothing happens when I turn the knob from off to max. Even when the knob is off and I switch it to high it blows air out.
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[pontgta]

Originally Posted by Claytona08

I have a 84 C10 and the air hadn't worked since I bought the truck several months back. I bought a kit to convert it to the 134 coolant. I cranked the truck and turned the air on max. Nothing happened. When I turned the air on high it would blow hard but no cool air. I'm confused on why nothing happens when I turn the knob from off to max. Even when the knob is off and I switch it to high it blows air out.
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Did you put the Freon in...LOL..... OK, so what are the pressures? no gauges? Take the low side pressure switch and bypass it and the compressor should cut on, if not you have to see why. of the compressor cuts on then you will probably be low on Freon.

[Claytona08]

The kit I bought has some gauges with it and showed after I put a can of freon in it to be approx. 50lb. What do you mean by bypass the low pressure switch? Thanks for your help.

[86c20]

50 may not be enough renember low presser no pump. i think these trucks take aroubd 2.5 of freeon.
also 134a will be 70psi at 70 degress. try adding one more can and i bet it will come on
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[Claytona08]

Oh ok, The instructions told me to put 50-55psi @ 90 degrees. I wasn't sure on what to do to be honest. I'll give it a try this evening.

[pontgta]

Originally Posted by Claytona08

Oh ok, The instructions told me to put 50-55psi @ 90 degrees. I wasn't sure on what to do to be honest. I'll give it a try this evening.

That is correct 50-55, but that means when the compressor is on the pressure should be about 50-55.

When i said bypass the switch....I meant taking a wire and disocnnectinng the switch form the accumulator and bypassing the plug. should have 12v at one of the wires on the connector. take volt meter and one lead to ground and the other to one of the pin on the connector and should read about 12v...

[wraprail]

Do you even know if the compressor is coming on?
The center should "click" on and spin with the pulley/belt

No compressor spin=no workie

[Claytona08]

So I got the 3 cans of freon in the AC and the compressor cuts on for a second and then cuts off. It keeps doing that over and over. The clutch on the front of the compressor kicks on and off.

[86c20]

do you know what your pressures are? got to no so you know how much more to go

[JellyBeanDriver]

Originally Posted by 86c20

do you know what your pressures are? got to no so you know how much more to go

Agreed. The cycling switch turns off the compressor when the low side pressure is too low. It can be low because it's too cold on the low side, or the pressure is too low due to insufficient fill.