a/c continuosly blows

[rs657f]

Hello all,

My a/c keeps blowing cold and will not turn off no matter what i do. Any thoughts on what could cause this? I have no clue where to start, is it a stuck compressor?

Thanks

 

[SunlitComet]

either relay is stuck pressure is to low or a pressure switch is malfunctioning. how cold is the air?

 

[rs657f]

it blows cold. not ice cold id say high 60s. Im going through all the wires and attempting to locate the fuses. I removed the 10a fuse for the a/c from the panel inside the door/dash and it cut off. As far as low pressure, do you mean low freon? Im not familiar with a/c systems

 

[rs657f]

it blows cold. not ice cold id say high 60s. Im going through all the wires and attempting to locate the fuses. I removed the 10a fuse for the a/c from the panel inside the door/dash and it cut off. Im going to order some relays for the truck and start swapping them out. As far as low pressure, do you mean low freon? Im not familiar with a/c systems

 

[SunlitComet]

yes low refrigerant since you removed the in dash fuse and it cut off we do know that the dash unit is requesting a/c ops and that the the compressor relay works properly. i can assume that when the fuse was pulled that you actually had the head unit set to a/c on. if not that is another issue to add. before further analysis what year are we talking here?

 

[rs657f]

yes i did have the dial set to a/c on when i pulled the fuse. Just incase i am having brain farts ill go try it again. I have the 96 5.7L. I was under the hood again this morning and noticed a vacuum line is missing that connects to that black knob on the left of the green hose. Not sure if this is playing a factor. I think this is the heater valve? see pic below

 

[SunlitComet]

heater water valve yes get proper hose and connect to solenoid on firewall nearby.

 

[rs657f]

thanks i will get a hose tomorrow. It looks like a 3/4 vacuum hose or a 5/8. Hard to tell but ill head to autozone in the am. thanks

 

[SunlitComet]

now way the inner of the line is like 1/8" roughly. maybe 5/32". i forget. it just sucks on the nipple.

 

[rs657f]

oook then lol..

I added the vaccum hose. A/C still blows on high, i keep getting pointed to the heater/blower resistor? What are the symptoms when that goes bad?