Lil AC help needed
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Freshman User
Joined: Jun 2019
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Lil AC help needed
Got this truck couple months ago
2008 f250 5.4gas
ac blew cold only on driver side and from what I understood I needed to replace the passenger blend door, but
yesterday ac compressor stopped!!! No cold air, I only have the low side gauge but it was on 150psi in the red.
not sure what to other than get both gauges and get some better numbers, the compressor does not come on
2008 f250 5.4gas
ac blew cold only on driver side and from what I understood I needed to replace the passenger blend door, but
yesterday ac compressor stopped!!! No cold air, I only have the low side gauge but it was on 150psi in the red.
not sure what to other than get both gauges and get some better numbers, the compressor does not come on
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
I only have the low side gauge but it was on 150psi in the red.
I understood I needed to replace the passenger blend door,
Junior User
Joined: Aug 2019
Posts: 93
Likes: 1
Hello, I would first check the AC fuse, then check to see if your AC compressor is good and will kick on by jumping power across your AC relay. Your AC system has a low pressure switch in the system that will shut the compressor off to protect it until you have enough Freon in the system to run it. Unless your compressor is bad ? My guess is that your Ac system has a slow leak in it and the low level of Freon in the system is keeping the compressor from kicking on. If this is the case and your compressor is good, you will also have to have the AC compressor running when charging the system or it will not draw the Freon into the system. I am in no why an AC expert, I just know enough to keep my own AC operational. Good Luck
Last edited by 416bigbore; Aug 24, 2019 at 04:53 AM. Reason: to add more info
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
My guess is that your Ac system has a slow leak in it and the low level of Freon in the system is keeping the compressor from kicking on.
I’m not sure if it being messed up would have effects on the compressor.
Without your knowing how the PCM-controlled A/C system is supposed to work, here's a couple of simple things you can do to.
IMPORTANT: Certain engine-related faults will disable the A/C system to limit the load on the engine. Scan the PCM for faults FIRST.
Check the clutch gap (if it's excessive, it won't engage).
Check clutch connector.
Check fuses F30 & F70 under the hood.
Swap the A/C clutch relay for an identical relay that is not critical for operation of the engine.
Locate and jumper the low-pressure cycling switch to see it's failed open
Locate and jumper the two CORRECT pins of the high pressure dual function switch to see it's failed open. (Blue-green & gray wires).
Check the wire harnesses at both of those switches for damage or open circuits.
After that, you have to get serious.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
That would be highly unlikely. The diode isn't even needed for the clutch to operate. It's only there to keep other stuff from getting fried when the clutch is de-energized.
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Freshman User
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Well the ac clutch fuse #30 10amp was jumped, I put in a new one 3 times just to watch it pop. I checked the clutch diode and it was jumped, put in a new one and a new fuse and it works!!!
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