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post #1 of 2 Old 07-23-2013, 12:39 PM Thread Starter Rookie
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multiple problems

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Multiple problems


I have 2007 F350 that I am having issues with. Half way through vacation my A/C decided to only come out of the defrost vents and the turn signals don't work but hazards do. I replaced the flasher relay and multifunction switch to no avail. Checked wiring in steering column and nothing seems to be broken. Pulled about every fuse and nothing blown. At a loss as what to do next with this issue. As for the a/c issue I found a gray vacuum line detached by the oil fill. Reattached line, still nothing. Checked all other lines and they seem to be good. Vacuum pump didn't seem to be coming on so replaced that. I thought I had power to the pump but now not sure. Is there a fuse controlling that as well? Sorry for the long question, but I am at a loss as to where to go from here.
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post #2 of 2 Old 07-23-2013, 01:11 PM
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Hopefully it's obvious that the two issues aren't related.

The A/C issue -- you have a vacuum leak somewhere. If your truck has electronic shift on the fly (ESOF) 4x4, try engaging it. Most likely the 4x4 light will come on but you won't actually have 4wd. Troubleshooting the vacuum leak is a royal pain in the neck. Bad hub seals are often the cause in the 4wd trucks. That grey vacuum line you found and attached blocks off the heater core so your max A/C is more effective.

Turn signals -- if you're sure that all of the fuses and relays are good, it may be time to start tracing wires and looking for chafing and/or weak connections.


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