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There is low pressure on the vaccume pump - Master Heaters B155DST

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Correction- the pump is not a vacuum pump. I produces positive pressure. Follow these instructions. It's easy.

Posted on Dec 22, 2008

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when you are stoped does the car idle fine. when the rpms are low the compressor does not get the pressure up high enough. you may need to get you idel turned up a little or your vaccume advance may have a vaccume leak.

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1 Answer

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1st Thing,
Located Someone With a Set Of A/C Gauges 134A Freon,
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1] Low Freon
2] Bad Low Pressure switch
3] Blowen Fuse[s]
4] Electrical Problem[s]
[a] Digital Climate Controlled ?
Climate Control Self Diagnose From Button's On Unit, OEM Manual Explains This,
If Yor Auto Has Digital Climate Control.
5] Bad Compressor DC Coil

Note: Does The Compressor Engage, Click-On When Button Is Pressed, But Getting
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Is One Of The Compressor Aluminum Tube's Cold, Be Careful Other Is Really Warm/Hot,
If Cold and or Sweating, Dripping Water [Normal], You Are Blending Hot Air w/Cold
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If This Is So, If A Vaccum Controlled Temp Unit, Check For A Vaccum Hose Bad,
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Unit, If OK, Might Be a Bad Blend Box Diaphram, [Control's A/C air, Blocks Off
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If Your Auto Is Vaccum Controlled, Can You Changed From Bottom, Dash,
Defrost Air Flow?, Yes, No Vaccum Lost Feeding Controller, Still Might Have
Bad Diaphram Blending Hot Air w/Cold If Your Have Cold Alum-Tubing In
engine Compartment.
If Digital Climate Controlled, Might have Diaphram's, Vaccum Controlled or
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and Without The OEM Mgr's Manual[s] You/Be Would Be Lost, especially w/Electrical.
Later, God Bless

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1 Answer

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1 Answer

A/c warm low and high side pressures wrong


it could be one of 2 things.
you didn't vaccum it all the way or there is b clog in the system. next time u flush it run about 1/8 cup of rubbing alcohol through it . then push clean air through it. then refill it. if that doesnt work replace the seals on the compressorlow and high side lines/manifold.

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