This is topic ventilation system problems: stuck on de-frost? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 89saleen (Member # 3083) on :
 
Im a heck of a good wrench- but what the hell is the deal with the climate controll selector switch not functioning? Im stuck on defrost mode. The A/C compressor comes on cold when you select it, but it still blows out the windshield vent. Select to max A/C- still blows out windshield. (should blow out dash panel vents) I checked the climate controlls, and in back of it, but everything looks intact- Anyone know how to test this? I know that there is vacuum involved with those little tubes, but anyone know the basics on fixin?

Thanks
 
Posted by slidewayz94 (Member # 3101) on :
 
Help anybody??? Mine does the same on occasion
 
Posted by 67aquafastback (Member # 3090) on :
 
For safty reasons your system will default to the defrosters when the system looses vacuum. First place to check is the vacuum lines under the hood ( the ones that go into the firewall ) Alot of times they will get hard and brake in half. If this all checks ok then check the vacuum lines under the dash If I remember it is the yellow line you want to check I could be wrong on the color. 9 out of 10 times it will be under the hood on the back side of the motor check it out first.
 
Posted by slidewayz94 (Member # 3101) on :
 
67fastback- thanks for the help, I found my problem a cracked line. The line cracked near the heater core hoses, although my line was black. I did a temp. fix job of duct tape. At least it works, and ordered a new line from ford.
 
Posted by 67aquafastback (Member # 3090) on :
 
quote:
Originally posted by slidewayz94:
67fastback- thanks for the help, I found my problem a cracked line. The line cracked near the heater core hoses, although my line was black. I did a temp. fix job of duct tape. At least it works, and ordered a new line from ford.
You can also use a small section of rubber vacuum hose to splice together the broken section. This works very well and will be much easier than replacing the complete hose assembly. As for the yellow vac hose it is located under the dash not in the engine compartment. Ford color coats the under dash vac lines for diag reasons.
 




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