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Old 11-19-2010, 08:33 PM
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Heater quits in 4x4

2003 F350 6L My heater starts blowing cold air everytime i put my truck in 4 wheel drive, when i take it out of 4x4 it starts blowing hot air again. Could this be due to a vacuum leak in the hubs?
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Old 11-19-2010, 08:49 PM
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Yes, you have the dash mounted 4x4 shift right? Have you rebuilt anything in the wheel hubs lately? Check the lines to the hubs as well. Sounds like you have a nasty leak.
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Old 11-20-2010, 12:22 AM
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This might help. It is for an 04.
Attached Files
File Type: pdf AC Climate Controls.pdf (60.6 KB, 59 views)
File Type: pdf ESOF Vacuum.pdf (749.9 KB, 96 views)
File Type: pdf Vacuum Control Motor Air Inlet Door.pdf (46.3 KB, 67 views)
File Type: pdf Vacuum Control Motor Panel Defrost door.pdf (45.7 KB, 54 views)
File Type: pdf Vacuum Control Motor Panel Floor door.pdf (63.7 KB, 53 views)
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Old 11-20-2010, 08:49 AM
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Yes its dash mounted shift. Thinking it must be the yellow O rings in the hub assembly but is there and easy way to check? I haven't done any work to it since about april when i changed one of the hub assembly's.
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Old 12-09-2010, 01:41 PM
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There is the smaller o-ring around the outer hub, the big o-ring around the hub, and the axle seal that can cause vacuum leaks. My vacuum leak was coming from not replacing the o-ring on the outer hub when I did my ball joints. i could hear a hissing when i turned the key on the truck and only got air from the defrost. To stop it temporarily I packed the whole area where the ring seats with grease and put the outer hub back in. That would stay until the grease dried out, so I bought a new one and no problems. So if you didn't replace those o-rings when you did your hub or removed the axle for some reason without replacing the axle seal those are places to look
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