Air conditioner does not blow any air

SYLVER

MEMBER
1999 FORD EXPLORER
V8
AUTOMATIC
230,000 MILES

The air conditioner in my vehicle does not blow any air at all in the front vents, it only blows air from the defrost vent. The heater still blows hot air. I checked the Freon and its at normal levels. No leaks and I even changed the air conditioner compressor to a brand new one. What could be the problem?

2 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Blend door motor has properly failed I will see if I can find a picture for you.

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Sunday, July 31st, 2016 AT 1:12 AM

WRENCHTECH

MECHANIC
20,761 POSTS

Blend doors control temperature, not air flow.

The mode selection is done through a series of air mode 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.