Need A/C Help
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Cargo Master
Joined: Sep 2004
Posts: 2,691
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Need A/C Help
I recently purchased a 92 F150 2wd and the A/C doesn't work. When I turn the **** to A/C nothing happens. The pump doesn't engage and I only get warm air. How does one troubleshoot this problem? The fuse is good. I did notice that there's a broken vacuum line coming out of the firewall and then making a 180 degree bend back to some sort of diaphram sitting on top of what I think is the box that holds the heater core. This box is on the firewall just under the hood on the passenger side corner of the engine compartment. The vacuum line isn't broken apart. It is as though the bend created tiny cracks and over time the upper half of the bent portion of the hose crumbled off. When I touched it little pieces just fell off. Could a vacuum hose have something to do with it not working?
Senior User
Joined: Feb 2005
Posts: 242
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From: Pittstown NJ
well first off fix the broken vaccum line then check to see that the AC system has a charge in it if it has a good charge try jumping the low pressure switch and see if it engauges the compresser if it does and blows cold air then the low pressure switch is probably bad
Senior User
Joined: Feb 2004
Posts: 292
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From: Kansas City
That hose probably goes to the damper for hot cold air control, or the fresh/recirc damper.
You have to get a refrigeration gauge. Does it have r-134 in it? There should be a sticker on the compressor or the hood.
The easiest way is to take the connector off the compressor clutch and connect 12v and ground to it. The clutch will click and it will run or stop the engine.
Did you check the fuses and relays? It is fused.
You have to get a refrigeration gauge. Does it have r-134 in it? There should be a sticker on the compressor or the hood.
The easiest way is to take the connector off the compressor clutch and connect 12v and ground to it. The clutch will click and it will run or stop the engine.
Did you check the fuses and relays? It is fused.
Thread Starter
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Cargo Master
Joined: Sep 2004
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Likes: 6
I don't have a gauge but I could get one.
I don't know if it has r-134.
It seems like there was only one wire going to the compressor. Is this the connector you're talking about.
The fuse is good but I don't know about the relay. How do you check a relay?
Is one of these the drawing: https://www.ford-trucks.com/lc/lc.ph...1991Heater.gif
http://i54.photobucket.com/albums/g91/subford/Vacuum/1995ACVacuum.gif
I don't know if it has r-134.
It seems like there was only one wire going to the compressor. Is this the connector you're talking about.
The fuse is good but I don't know about the relay. How do you check a relay?
Is one of these the drawing: https://www.ford-trucks.com/lc/lc.ph...1991Heater.gif
http://i54.photobucket.com/albums/g91/subford/Vacuum/1995ACVacuum.gif
Last edited by qman; Aug 2, 2006 at 11:52 AM.
