Heater blend door dash plenum

Mike Butler

• 6674 Answers
• Posted on Dec 13, 2008

SOURCE: sometimes heater will blow cold

Clump sound is probably the blend air door inside housing moving to where it's supposed to be. Is that when you notice it heating like it should? Try to pay attention when driving to see if you hear that "clump" noise or feel different temperatures as you accelerate, and then let of the gas, which would indicate vacuum operation of blend air door, and tells you that there is a vacuum leak somewhere in the system, or a perhaps just a faulty check valve in the line somewhere. let us know.

SOURCE: have 1996 lin towncar where n how 2 fix blend door 4 heat n a/c

In order for the blend door actuator to be replaced, the dash must be removed from the vehicle.

SOURCE: My 2004 v6 lincoln ls air conditioner freezes up

One of 2 problems,either the system is low on freon or most likely the problem is a bad evap temp sensor. This vehicle does not use a cycling switch to cycle compressor on and off like a conventional system does but instead measures the temp at the evaporator core itself.

SOURCE: 1997 Lincoln Town Car; nothing but heat

check your vaccum lines behind the dash. if you find the one that goes to the blend door, put some vaccum on it and see if it opens and closes for you. if not, then yes, your blend door is broken. if it closes, check your temp control gauge.

SOURCE: 1994 lincoln town car, almost no heat, blend door

I had the same problem no heat or very little heat. my garage found the problem to be up under the dash something to do with the heatting door stock open try checking under the dash.