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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 07-04-2011, 02:41 PM
Alfisto Steve Alfisto Steve is offline
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Default Where is vacuum tank for a/c doors?

Dash A/C doors close under acceleration. Must have a bad connection or check valve for vac tank.

Where is vac tank is it under dash?

2000 Dodge Ram 1500 SLT 5.2L

Last edited by Alfisto Steve; 07-05-2011 at 07:01 AM.
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Old 07-04-2011, 02:57 PM
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Mine is located under the drivers side of the dash behind the ABS control box just to the right of the gas pedal and up. Silver barrel looking thing with an accutator hooked to the flap. My plastic connector broke so i need to figure a way to fix that. But thats where it is at........
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Old 07-04-2011, 09:54 PM
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Here it is,I assume this is what you are looking for?, I need the plastic thing the accutator goes to if anyone knows the part number/name and where to get one?
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Old 07-05-2011, 07:07 AM
Alfisto Steve Alfisto Steve is offline
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Thanks but, that is vacuum actuator for doors not vac storage tank and check valve which keep it open (retracted) so when under engine acceleration when engine vac falls off and that spring loaded actuator will not slam a/c air flow doors shut.

Maybe there isn't a vac tank and just check valve in vac line near firewall is bad?

TURNS OUT VAC CHECK VALVE INSTALLED BACKWARDS NEAR ENGINE FIRE WALL. Easy fix just reversed it!

Last edited by Alfisto Steve; 07-05-2011 at 07:44 AM.
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Old 07-07-2011, 11:17 AM
Alfisto Steve Alfisto Steve is offline
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Default Replaced Check Valve by buying Hose and Valve assembly

Had to just spend 15.93 to get the check valve by buying new 55055705AB vac hose and valve assembly.

BUT now the a/c doors in dash stay open under heavier engine accelerations.

Cheap fix!
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Old 08-07-2011, 10:39 AM
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Default 55055705ab

Dealer says this is for Cruise control, does it control both? Also was it located in the engine compartment?
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Old 08-30-2011, 10:35 PM
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I would like to know the answer to those questions as well. Thanks
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Old 09-15-2011, 04:12 PM
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I have this same problem, what was the fix? can you post pictures of the location?
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Old 09-16-2011, 04:52 AM
Alfisto Steve Alfisto Steve is offline
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OK, guys sorry for not reading your questions sooner. As for check valve and hose assembly I listed part number above. It is hanging off front of firewall just to right of centerline over right head area.

Tubing may also go to cruise control and check valve may help crusie control actuator maintain vac under engine accel but it also hold vac on dash vents.
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Old 09-16-2011, 04:16 PM
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found this...


there are two check valves
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