Possible vacuum Leak under dash?
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From: pittsburgh,pa
Possible vacuum Leak under dash?
The truck in question is an 03 Excursion 7.3L.
I went through all the vacuum lines today trying to find out if I have a leak. The truck has always defaulted to defrost when in 4x4. Last week we got hit with two snow storms so I have had to use the 4x4 a lot. I don't recall hearing the vacuum pump run, but since using the 4x4 so much in the last two weeks it runs all the time.
To I got a vacuum tester and when through all the lines under the hood. I replaced the line to the hubs, which took care of the heater defaulting to defrost. The vacuum solenoid checked out ok also.
The other issue I noticed is when I switch the heater from defroster to floor and defrost the A/C light turns on. It has never done this before until this past week. All the setting change and work, but I don't understand why the A/C would turn on like this.
I disconnected the black line running to the behind the glove box and hooked up the vacuum tester it held vacuum, but would slowly return back to 0. Is there a possible leak under the dash with one of the vacuum lines. It appears there are 6 different vacuum lines under there.
Has anyone else experienced this?
I went through all the vacuum lines today trying to find out if I have a leak. The truck has always defaulted to defrost when in 4x4. Last week we got hit with two snow storms so I have had to use the 4x4 a lot. I don't recall hearing the vacuum pump run, but since using the 4x4 so much in the last two weeks it runs all the time.
To I got a vacuum tester and when through all the lines under the hood. I replaced the line to the hubs, which took care of the heater defaulting to defrost. The vacuum solenoid checked out ok also.
The other issue I noticed is when I switch the heater from defroster to floor and defrost the A/C light turns on. It has never done this before until this past week. All the setting change and work, but I don't understand why the A/C would turn on like this.
I disconnected the black line running to the behind the glove box and hooked up the vacuum tester it held vacuum, but would slowly return back to 0. Is there a possible leak under the dash with one of the vacuum lines. It appears there are 6 different vacuum lines under there.
Has anyone else experienced this?
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