AC From Decrost Only - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 05-21-2018, 08:21 PM Thread Starter
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AC From Decrost Only

Can anyone help clarify the order of events in order to get air out of the vents? I have checked the vacuum lines under the hod, black and white hoses look good behind the kick panel, the blue hose connected to the vacuum solenoid under the dash looks good. If I manually push the lever under the dash, the vents blow hard and stay that way until the truck is shut off. Bad vacuum module??

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #2 of 11 (permalink) Old 05-21-2018, 09:44 PM
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Re: AC From Decrost Only

you need to check for vacuum at the hose connections, a visual check of the hoses is not good enough.

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post #3 of 11 (permalink) Old 05-21-2018, 10:40 PM Thread Starter
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Re: AC From Decrost Only

Iím getting no vacuum at the solenoid under the glove box with the blue hose attached to it. When I manually push it in with my finger, it stays open and the vents work.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #4 of 11 (permalink) Old 05-21-2018, 11:11 PM Thread Starter
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Re: AC From Decrost Only

What sends vacuum to the hose that connects to the solenoid under the dash? The selector switch on the dash?

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #5 of 11 (permalink) Old 05-21-2018, 11:56 PM Thread Starter
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Re: AC From Decrost Only

Iíve been looking at diagrams and yes, I should have vacuum to the blue hose when the Max, Norm, or vent is selected. I do not have vacuum at the hose. Does this point to a bad switch? Max and norm functions properly as well as vent so I know I have vacuum elsewhere.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #6 of 11 (permalink) Old 05-22-2018, 12:16 AM
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Re: AC From Decrost Only

it could be a bad switch. do you have vacuum going into it, and then out of it? th line from switch to that dashpot may be bad.

tom
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post #7 of 11 (permalink) Old 05-22-2018, 12:20 AM Thread Starter
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Re: AC From Decrost Only

I pulled the blue hose off the actuator under the dash and Iím getting 3-4Ē of vacuum but it obviously isnít enough to move the lever. Does anyone know how much vacuum I should get at the end of the hose?

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #8 of 11 (permalink) Old 05-22-2018, 01:07 AM Thread Starter
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Re: AC From Decrost Only

I have 22Ē of vacuume at idle to the check valve near the map sensor from the vacuum pump, so that part is good.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #9 of 11 (permalink) Old 05-22-2018, 02:25 AM Thread Starter
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Re: AC From Decrost Only

I replaced all the lines after that 1 way valve and all is good again. Lines all looked good but must of had a small leak somewhere.
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1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #10 of 11 (permalink) Old 05-22-2018, 02:23 PM
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Re: AC From Decrost Only

thanks for keeping this going until you found the solution! bonus points for you :)

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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2001 Excursion 7.3, auto, 4x4, 3.73, 6" Suspension lift, 37" Dick Cepeks
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