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  #1  
Old 04-01-2014, 12:24 AM
flako5rocks flako5rocks is offline
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Default Vacuum schematic?

I was wondering if any of you have a vacuum schematic for a 1997 1500 with the 3.9 non 4x4. I seem to have the ever so common air conditioning switching to the defrost vents. I sprayed all the ones i could see in the engine bay with carb cleaner and no luck. So i was wondering if there was a schematic so i could find the lines to check. Also could it be a leak behind the dash?
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Old 04-01-2014, 09:30 PM
Lazarus Truck Lazarus Truck is offline
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I have 97 FSM. I could look that up tomorrow. Cool?
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Old 04-02-2014, 07:10 PM
flako5rocks flako5rocks is offline
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Quote:
Originally Posted by Lazarus Truck View Post
I have 97 FSM. I could look that up tomorrow. Cool?
That would be perfect, as long as its there!
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Old 04-04-2014, 09:37 PM
Lazarus Truck Lazarus Truck is offline
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Sorry, been working 12's. I'll try to get it tomorrow. Exactly what is the issue? The system is designed to switch the vents to "defrost" whenever there is a large drop of vacuum. Such as heavy acceleration.
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Old 04-06-2014, 12:16 AM
flako5rocks flako5rocks is offline
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I know that it does it at heavy loss of vacuum but this is only at like a little above 1/4 throttle. There is also a miss only when the A/C is on. I replaced the IAC yesterday, helped smooth the idle and ceased the stalling bu the miss is still there. When the air conditioning is off it runs like a champ. The miss isn't constant when the A/C is on though so that is kinda confusing its only sometimes. Mainly at idle.
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Old 04-06-2014, 12:55 AM
Lazarus Truck Lazarus Truck is offline
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I went through the FSM today. I couldn't find a complete vacuum schematic. It was broken-up into different areas of the truck. I suggest you get a $10 harbor freight vacuum gauge, and actually read the manifold pressure of the truck. This is something that our grandfathers had in their toolbox. And although technology has changed, physics haven't! I'm Ol 'Skool, and the vacuum gauge is one of the most over-looked tools there are these days.
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