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ACE
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571 Posts
Discussion Starter #1
i have a 99 1500 with auto. 4x4. i get a vacum type sound from behind the dash i think and i dont know what it could be. anyone have any suggestions?

tom
 

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vacuum line or door actuator for your A/C... figure out what's not working... defrost door, hot/cold temp adjustment, etc... if you have a cracked dash id check the defrost door first...
 

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ACE
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Discussion Starter #3
how do you check the defrost door? do i have to pull the dash? the heat and a/c are working. there are just not very powerful. Ican barely feel them on low.
 

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pull out the radio. pull the heater vent controle and look. there are diaphrams on the hvac doors for every dial placement. possibly behind the glove box too. i removed my dash for a heater core and familurized with this sytem. either a line leakes or the controle or one of the door diaphrams seeps. youll need a flash light and practice your upside-down yoga, its not easy. through the radio and glove box should be enough room for your arms
 
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