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It is on the drivers side, near the top, a little bit forward of the linkage.
It is on above of right vent the button is there on the top of middle vent console
On an A/T it is the check/fill dipstick. On a manual, it is located on the top of the trans.
The vent hose is for either the transfer case breather or the transmission breather. A light amount of oil residue is normal. If there is a lot of fluid coming out of the hose then it is most likely caused from the transmission getting too hot.
Assuming you mean transmission vent: 1) Excessively high fluid level. 2) Tube has hose incorrectly located.
Use a funnel and put the fluid in the same hole as the the dipstick where you check it... This is for automaitc of course. If i goes in slow or not at all the vent is plugged on the top of the transmission....This can also cause the trasnmission to "blow off" fluid through the seals.
It depends on the year, for Cougars made from '99 till '02, the Automatic Transmission Breather hose is located on the drivers side of the engine, underneath the battery tray.
Check that the switch that moves from cool to hot (Is like a sliding switch on a 1990 Corolla I think) is actually opening the vent that controls flow of hot air
The Automatic transmission breather tube is on the drivers side of the vehicle and is under the air filter box under the hood, it often reaches up near the battery tray.
Allow pressurized gases to vent from the crankcase.
Trouble code P0446 means: Evaporative Emission System Vent Control Circuit
Sounds like a vent problem. Check the breather on top of the case to see if it's blocked.