No A/C...why?

[TrueBlue95GT]

I park my car at home while I'm at college. One weekend I came home and I have no A/C anymore. I get heat, but the Normal A/C and Max A/C don't push out cold air. Also, I noticed that the defroster doesn't take the humidity out of the air as well as they used to. What could be my problem?

 

[wytstang]

Does the compressor turn on at all? If no then pop the hood open and on the pass. side the accumilator*sp* has a pressure switch sitting on top of it( a little black container). Unplug the switch and bypass it using a paper clip or something and see if it turns on.

 

[Chronos[AsG]]

Yeah well dont bypass it too much. Mine did the same thing, just one day I had no more cold air. Turns out I had a leak in one of the a/c lines and eventually enough refrigirant leaked out to where the compressor wouldnt come on anymore because of the low pressure switch. Have a shop check your refrigirant level as you could easily have a hard-to-see leak. Running it too much without enough refrigirant will burn up the compressor because there is also oil in the a/c line to keep the compressor lubricated.

 

[ARed1995GT]

does it blow out of the defrosting vents only?

 

[juannaplay]

Easy Fix?

Check and see if your clock on the dash in still on. If it is off. You need to replace the fuse under the driver side. The clock and the A/C clutch are on the same fuse. You might have to go to a 30 amp fuse. The factory put a 15amp in.

 

[TrueBlue95GT]

The clock in the dash works, the air comes out of every duct when I want it to, so the vacuum line is not leaking. I gotta see if the compressor turns on. I do have coolant running through those two heater lines over the lower intake.

 

[wytstang]

Check and see if your clock on the dash in still on. If it is off. You need to replace the fuse under the driver side. The clock and the A/C clutch are on the same fuse. You might have to go to a 30 amp fuse. The factory put a 15amp in.

Please DO NOT do that those wires can only handle so much resistance before the wires begin to melt and expose them selves. By add a much higher fuse it may not pop the fuse in time to prevent the wires from melting and exposes/touching one another.

 

[smokediver27]

Check your freon level first, like they said, if it is too low, or too high, the pressure switch will keep your AC from coming on. If freon is ok, and compressor seems to be engaging, then bypass the switch quickly like they said. Just replaced my switch two weeks ago, 16 dollar part at autozone. Air works perfectly now.

 

[TrueBlue95GT]

I'm pretty incompetant when it comes to anything other than engine parts, so how do I check my freon level?

 

[Venom351R]

does it blow out of the defrosting vents only?

Whats that mean when it does, I cant get anything to come out of my vents that face me but they come out for the defrost for the window

 

[helix007]

dude take it to a shop

 

[wytstang]

Whats that mean when it does, I cant get anything to come out of my vents that face me but they come out for the defrost for the window

You have a vac line either disconected or broken. Check along the firewall I had a vac line break and the air would only come out of the defrost vents.

 

[wytstang]

dude take it to a shop

Why? If we can help him fix it for a fraction of the cost and he learns in the process that's what this place is for.

 

[Venom351R]

You have a vac line either disconected or broken. Check along the firewall I had a vac line break and the air would only come out of the defrost vents.

I was thinking along those lines since it dident make sense that I was just out of freon since my vents facing me were not working. I'll figure it out next spring, Im done messing w/ the car this yr.

 

[go-stang5.0]

If you know antone with a ac oressure gauge check the pressure in the system when its off...(should be around 120 psi) dont quote me on this. But if there is a good amount of pressure (around 100 or so) you have no leaks. And yes use a paper clip to jump the pressure switch on the accumulator. And dont worry when unscrewing it theres a check valve underneath so refrigerant wont leak out. Like said before dont jump for more than a second or two if the compressor comes on, keeping the comp. on like that can cause it to explode.

 

[helix007]

I really mean no offense to the original poster but reading his posts he sounds VERY inexperienced and VERY incompetent concerning Ford A/C and is going to spend a LOT more time and money than he would if he took it to someone. They don't necessarily have to fix it, just tell him what's wrong.

Then maybe he could attempt it.

The shorting of the low pressure switch is very basic electronics and it seems like even though you guys told him several times what to do and how to do it, he still didn't know what you guys were talking about.

My advice would be to buy a haynes manual, read up on the A/C section, figure out how it works, then come back and read this thread, ask a few more questions, and it will make a LOT more sense.

I was lucky because someone taught me how it works, in a hands on lesson of my old 87 5.0 some years ago.... I was able to recently fix the A/C on my 95, (after asking a few questions here about what kind of freon to use in a 95 and if anything has majorly changed between 87 and 95) by figuring out that the low pressure switch was bad....when I shorted it out, the compressor would kick on. HOWEVER, when I checked the pressure, it was reading the perfect nominal pressurization.

voila, new low pressure switch from autozone (18$) = cold A/C

good luck tho

 

[TrueBlue95GT]

It's not like I don't know anything about Mustangs, but I've never worked on the A/C system before. I've learned everything I know about cars through my mustang, and this is the first time anything has gone wrong with the A/C. I know what they're talking about, but I'm at college right now and I can't go 100 miles back home everytime a new post comes up to try and solve the problem. When I turn the A/C on, the clutch doesn't turn, but every once in a while it jerks slightly. I'm guessing I need a new pressure switch?

 

[smokediver27]

Only thing that confuses me trueblue is that when my switch was bad, the fan still blew air...just hot air. Seeing as how yours is not blowing at all,,,leads me to believe something else is the problem.
Actually,,playing mustang armchair QB, sounds like two separate problems. One is causing your fan motor not to blow. The other is causing your compressor not to kick in.. I'd guess the pressure switch is one part of the problem,,,unsure on the other.

 

[hawaiian]

Well if it just stopped working its probably not a leak they tend to slowly loose charge.
check the wire harness that goes to the compressor mine just fell out; twice. maybe thats all that happened to yours.

If you turn the AC on MAX does the idle start to go up and down?
you should here a clicking noise when the compressor clutch engages.

 

[TrueBlue95GT]

I'm not saying my blower motor is bad, it just doesnt blow cold air. Yes the idle goes up and down within a period of a second when the compressor clicks, but the compressor doesnt keep on turning. It clicks and stops.