the a/c in my 03 crown vic blows out of the defroster for 6 to 8 minutes, then defroster and floor for a minute or 2 and then to the vents where it stays until i restart.


Asked by Jul 15, 2013 at 07:37 PM about the 2003 Ford Crown Victoria LX Sport

Question type: Maintenance & Repair

i've already changed the eatc unit in the dash but it's exactly the same

8 Answers


The EATC has little to do with the vacuum supplied to the register selection. Start under the hood. There's a vacuum line that runs through the firewall at or very near the heater hoses. That vacuum line is connected to manifold vacuum at one end and a "T" at the other with a Check valve and a vacuum reservoir. The check valve and reservoir keep vacuum on the Climate Control system when pulling a long grade or at an extended WOT. The default is Defrost if the vacuum fails. Vacuum leak at reservoir, failed check valve, vacuum leak at control head. Start simple under the hood - at the source and work your way back.

8 of 8 people found this helpful.

It doesn't default to defrost, it starts out on defrost and takes about 10 minutes till it starts coming out of the vents. This is what's confusing me.

1 of 1 people found this helpful.

Pardon me. Default means that if the system is broken, it will always go to Defrost.


I work on a fleet of 800 Crown Vics and see this regularly.

7 of 7 people found this helpful.

Mark, did you know my Dad, Donald Kolb. He worked fleet.

I meant Tracy....



1 of 1 people found this helpful.

I am having a problem sim, my ac doesnt work and now with everything turned off when driving heat is coming from the front window defrost, dont have money to fix anything just wwant to stop the heat comiing out with everything off

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