1995 Ford Thunderbird top vents not blowing

Tiny
LUKERP77040
  • MEMBER
  • 1995 FORD THUNDERBIRD
Air Conditioning problem
1995 Ford Thunderbird V8 Two Wheel Drive Automatic 140k miles

My a/c was working fine and now the upper vents do not blow anymore. I've checked the fuses and are good but I do not know how to check the relays. If anyone has any info that could help it will be greatly appreciated.
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Friday, August 27th, 2010 AT 4:54 PM

4 Replies

Tiny
WRENCHTECH
  • EXPERT
Do you mean the air is coming out of the defrost vents instead of the center vents?
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Friday, August 27th, 2010 AT 5:20 PM
Tiny
LUKERP77040
  • MEMBER
Yes it does come out of the defrost vents.
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Friday, August 27th, 2010 AT 5:31 PM
Tiny
WRENCHTECH
  • EXPERT
The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.

Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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Friday, August 27th, 2010 AT 5:37 PM
Tiny
STEVE PERRY
  • MEMBER
I have a 1983 ford thunderbird and put in brand new blower motor ac evaperater core and heater core still no air coming out of any vents floor or defrost help me!
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Tuesday, July 12th, 2016 AT 7:12 PM

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