A/C imput.

[Slyclone]

Air is not working. Have not used it at all since owned truck. There are 2 wires attached to compressor housing. With system on, MAX AC, BI level, Does not power up. I tried to probe the area as well for 12v or any type of signal and nothing. Also traced the wire back to the rear of engine. The black is a Ground. where does the green migrate to the ECM?

Looked for what I thought was the relay and its on the pass side furthest side fire wall? 2 cubes this one is a BOSCH unit.? COuld that be bad? how do we test out. I tested the 4 wires comming in and 2 supplied 12v

 

[spooldup]

Re: A/C imput.

Does the sytem have freon in it? If not the high side switch will not close therfore the ac system will not operate. If there is no freon and you have never opened the system to let it out then you have a leak wich will need to be fixed.

 

[T-Bone]

Re: A/C imput.

Disconnect the battery and wait 2-3 minutes (Resets the ECU). Reconnect and then try your AC on the MAX setting. If the compressor clutches engage, shut it off and add freon (hope you are R134a and no longer R-22). If you permit it to continue to run w/o the proper freon level, it will lock up OR go back into permanent shut down mode to prevent the compressor from burning up. Hope it is an easy fix for you.

Otherwise, you need to test the switch sensors on the Lo and High pressure sides to ensure they are functioning as designed to send the proper signals to engage and disengage the compressor.

 

[Slyclone]

Re: A/C imput.

I have paper work on the system it was updated not too long ago and charged up with the 134a, I did see it was converted. Its been approx a year and some change. It was recently done. Told not to remove or crack any lines becasue it was a real treat to look forward too.

Suggestions are freon is too low I notice some green oooze on the little blue fitting that looks like a fill site. Removed the cap and looks like a small amount could have leaked out the schrader?

Pretty sure there is freon inside the system. I heard it click 1 time real fast and thats it other than that it blows hot air.

Maby the Clutch or what ever mechanical is already seized up.

 

[T-Bone]

Re: A/C imput.

The click you hear is most likely the clutch engaging and then it disengages due to low R134a. As a result, you are getting hot air. Add 1-2 12 ounce cans and you should be good for a while. Connect the fill line before engaging the AC unit because the R134a will only be drawn into the line while the compressor is working. The area you see some liquid is the fill location and if you tapped the valve accidentally, some will ooze out.

 

[Slyclone]

Re: A/C imput.

Thank you again. I spent last night trying to pump whats left of a Can inside the system. My bro had a can laying around he said I could use. funny it was like Empty. I ran out and got a new can last night.

Truck was too hot to monkey with last night and I just prepared. (kenne bell Intercooler charge pipe) has to be removed or unbolted, Not enough room for the fitting to clip on. Well started her up, pulled trigger a few times. looked @ where I was at, and BAM click, click, No more looking anyfurther

 

[Brassmonkey]

Re: A/C imput.

Take it to some one that knows something about a/c, or you will mess it up further. There is a very good reason why people are certified to use refrigerant.

 

[Slyclone]

Re: A/C imput.

The Click Click was the compressor engaging

 

[Mobile22]

Re: A/C imput.

Do you hear the relay on the drivers side firewall click on and off repeatedly when you turn on the a/c?

 

[Slyclone]

Re: A/C imput.

negative. false alarm, pumped the stuff in. capped it. went for a ride poped hood, showed my dad, took cap off and last few threads it blew off. some type of small leake at schrader.

would explain the green ooze/slime first time i removed.I did think i had a tool for hvac and schrader valve removal, but its not long enough. A small snap on pocket screwdriver worked for now to get the thing to stop hissing. Im pretty sure it was low the 1st due to this problem. Some one messed with it before.