Hi everyone,
I have 1990 Merc Cougar, v6 3.8 auto. AC have been kind of cycling for a while, meaning that it will blow, then stop blowing but I still heard the motor/compressor, I guess. Then it became nessesary to adjust the blowing speed to higher to achive same effect in cooling while all the same it will stop temporaly blowing air. Now nothing comes out of the vents at all, with the exeption of the defoggers (right under windshield) wich doesn't do much to cool the car in the FL heat. What's going on? I checked the vacuum hoses, one was damaged and I fixed that. It feels like it's clogged, but I keep it clean from debris. The air that comes out from defoggers is very cool and strong. Please, help.
Irina

 

most of the time its due to a bad vac line or disconnected vacum line under the hood double check all smaller vacum lines coming from the firewall to make sure they are hooked up might also pull them off and make sure there is vacum there with the engine running.
it could also be a vacum switch problem in the control head or a bad actuator but vacum operated actuators rarely fail.

 

Some vac lines do not have vacuum. There is one, for instance, that's connected to some round part, I don't know what it is, but it's next to MAF sensor. There is also a double vac line, and the upper line has vacuum in it and the lower doesn't. what should I do here?
Thanks

 

im not sure what your reffering to but suspect it might be the egr and egr solenoid wich would be normal for it to not have vacum going to it most of the time, you really should just find the vacum line coming through the firewall at the back of engine compartment as it goes from the engine compartment to under the dash and is used to operate your vents this is the only vacum line you should be concerned about.