Can anyone help with my A/C problem? i have plenty of freon, so it should engage the switch. i have a new compressor, orifice and evaporator. The blower is only blowing out hot air. i live in okc & today's high was 100.

 

Did you change the stuff? If so you may need to take it somewhere to have all the air vacuumed out then charged. If it's 134 it shouldn't cost that much. Also check the pressure switch.

 

it was all done last year. it almost froze me out a few times last summer. it has plenty of freon, my gauge read a full charge. where is the pressure switch, on the evaporator?
any help is greatly appreciated.

 

You didn't mention that your a/c clutch was engaging....so sounds like an electrical problem to me.

The low pressure switch is on the accumulator going into the evap. Definitely check that first. Sometimes it is even the connection at the switch that goes bad. Check the continuity on the switch (with truck off). I believe it resets at 50 PSI (you should be well above that). If that is good, bare some wires going into the disconnect and jumper. This tests the male plug going into the switch.

Check your coil on the compressor clutch as well. With the truck off, pull the disconnect apart and run a jumper to ground and run the other point to the pos. terminal on your battery. You should hear the clutch pull in. If that is good, jumper the male plug. I have had that go bad on my girlfriend's Neon.

Check your other switches as well.

 

Oh..sorry bout not mentioning the clutch. Going to O'Reillys at noon today for a new switch. looked at old one - looks really bad - going to go ahead and replace it, only thing left i haven't replaced yet.
thanks for your help.

 

Installed new pressure switch & that didn't work. I jumped it to the battery & that enable the clutch to engage but it was still blowing out hot air. There is an adequate supply of freon, i'm stumped!
Can anyone help?

 

Does the compressor clutch engage on its own, or only when you jump it straight to the battery?

Did you turn the a/c on while the clutch was jumped?

What were your operating pressures on your low and high sides (and what refrigerant)? Remember, static pressure does not always indicate full charge....the system has to be operating.

Typically, though may not apply, these things will keep your clutch from electrically engaging:

LP switch (by accumulator)
Evap low temp switch (by evap)
HP switch (usually on your compressor)
Fuse
Clutch (a/c) relay
Faulty wire or switch connection

 

Thanks for the reply. the motor is running & the clutch will not engage on its own, i had to jump it to the battery. the low side - pressure was 50 psi. didn't check the high side, didn't think i needed to. my ignorance.

refrigerant is r134.
i didn't know about all these switches-i'm just a stupid accountant.
i'll check them. one other question-how much pressure on the high side?

 

High side pressure varies under certain conditions such as load, outside air temp, and air flow across your condenser. Usually pressures will range from 180 to 285 PSI.

It sounds like your system is operating properly from a mechanical standpoint.

Have you checked the fuse?

Do you have a multimeter?

I don't have a schematic, otherwise I would give you a step by step check. I know my girlfriend's Neon inside and out, but haven't really had to dive into my F150 electrically too much.

If your LP switch is good, do you have power going to it?

Check continuity at the HP switch (should be on compressor) and Evap temp switch. Check for power at each as well.

 

I'll do just that and thanks!