A/C thru defroster only
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A/C thru defroster only
I have read and troubleshooter for vacuum leaks but this has me even more confused!!!
2006 Harley Edition F250 6.0 Diesel
When temp outside is around 75 degrees or cooler blows and switches between different settings as normal. A/C will blow hard thru dash vents and freeze you out. When it gets hot outside it will only blow thru defrost!!!! So on wat to work in morning everything is perfect - driving home from work when it is 100 outside it only blows thru defrost (cold cold air though).
Confusing the heck out of me because a vacuum leak doesn't care about the outside temperature....... any ideas???
2006 Harley Edition F250 6.0 Diesel
When temp outside is around 75 degrees or cooler blows and switches between different settings as normal. A/C will blow hard thru dash vents and freeze you out. When it gets hot outside it will only blow thru defrost!!!! So on wat to work in morning everything is perfect - driving home from work when it is 100 outside it only blows thru defrost (cold cold air though).
Confusing the heck out of me because a vacuum leak doesn't care about the outside temperature....... any ideas???
Fleet Owner
Joined: Apr 2008
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From: 0,0,1
If you have EATC and not manual controls it could be the EATC unit acting up when it's hot. When it only blows through the defrost run the built in self test described here: Ford EATC Self Diagnostics
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
You have a vacuum leak or weak vacuum pump. Your heating/AC system and probably your 4x4 system are controlled by vacuum. If the heating system doesn't have enough vacuum to power the system, the default is blow through the defrost vents.
The 4x4 hubs won't engage if the vacuum isn't working on trucks with ESOF.
The 4x4 hubs won't engage if the vacuum isn't working on trucks with ESOF.
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bulletpruf
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Aug 1, 2013 11:08 PM
