A/C PRESSURE SWITCH ???

[MIDNIGHT RIDER]

Is there any way to check the pressure-switch on my A/C??

When I turn on the A/C, the clutch will not click in.

I can unplug the wires at the pressure-switch, jump across the plug, and the clutch will click.

I may have caused a leak in the system when changing engines; or, hopefully, the pressure-switch has gone bad.

I have searched NAPA and ADVANCE for a part number for the switch and had no success.

Does anyone know a part number/price for the switch??

Thanks.

 

[ramon f350]

I will have to get home and look in my records and pull the ticket on my switch.

Ramon

 

[patternman]

I'd like to know the answer to this also. My AC system was recharged and AC stilll
doesn't work clutch doesn't kick in, though it will if I jump the lead with 12v.
Does system have to be recharged after replacing pressure switch?

 

[82fordtruck]

There are two switches, one on the compressor, and one on the drier. Both can be bypassed by simply shorting the wires together, but I have had substantial trouble with the pigtails going into these. They are both available at Ford, for about $15 per. The switches are also available.

Try hotwiring these switches, and if it works, you need to get a set of guages on it. If it's all OK, then replace the switch. But, look at the wiring a little better first. This is where all my problems were.

 

[ramon f350]

no you just unscrew it from the dryer. I will look when I get home I would imagine that your switch is bad it is only about ten bucks

Ramon

 

[towcat]

bite the bullet and have your system pressure checked. if the clutch is engaging when the switch is bypassed, there is a very good chance your system is low on freon. prolonged running with low freon will result in a burned up compressor. the switches do fail but not as often as you want to think.

 

[patternman]

There are two switches, one on the compressor, and one on the drier.

I don't see a switch on the compressor only a single wire to clutch coil. Thats the one I can hit with 12v and the clutch will kick in.
The system was recharged but don't know if it was checked for leaks. I just ASSumed it was. You know how that goes!

 

[82fordtruck]

it's screwed into the manifold on the back of the pump, with two wires going to it.

 

[patternman]

it's screwed into the manifold on the back of the pump, with two wires going to it.

There is definitely only one wire that goes to my compressor. I can't find any terminals that may have come unplugged nor do I see any loose wires.

 

[82fordtruck]

There should be two wires going to the pigtail that plug into the clutch at least. Maybe they didn't put this switch on the older trucks, or yours was modified.

 

[patternman]

Maybe they didn't put this switch on the older trucks, or yours was modified.

Maybe AC was dealer installed, doesn't really look like a mod job. Doesn't look
like factory harness either.

 

[82fordtruck]

wow, that looks nothing like any ford compressor I've seen.

 

[patternman]

The control panel is Ford.

 

[The Warden]

That's definitely not an FS-6, nor does it use the same bracketing (at least from the pics I can see). Do you have any overall shots of the engine compartment? I'd love to see a shot of the heater box assembly on the engine side...that'll help determine whether your setup is a factory one with a different compressor (something a previous owner did, maybe?) or if it's dealer-installed.

I thought that most dealer-installed setups either used the FS-6 or a York compressor...that one in the pics doesn't look like either...

 

[sassyrel]

that was dealer installed air--done a few--and thats the comp they used--you only have the switch on the drier--