Color coded HVAC lines, who does what? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-01-2007, 10:59 AM   #1
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Default Color coded HVAC lines, who does what?

"95 Olds 88 without EEC. AC quit cooling. Through check shows everthing under the hood is up to snuff. Suspect vacuum issue with controller. I checked air mix acuator and it is moveing smoothly. Even disconnect arm and moved door manually. Traced vacuum feed from engine to vac tubing manifold plug inside car and its getting vacuum. Now I suspect one of the vacuum acuated valves inside car is not functioning. Would any of you guys know the color coding of the vac lines going to and from the dash control and what they operate? Does the air mix acuator move more than the external arm? Acuator looks like it might be connected to another door thru a square drive lookin thing. I have most of the dash out now and am chasin vac lines but knowin what works what would sure help. Thanks again.
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Old 09-04-2007, 01:06 PM   #2
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Just for our information, what makes you sure that it is a vacuum issue? Have you already checked the refrigerant level, compressor, and pressure switches to make sure they are functioning correctly.

From your post, it looks as iff you have read one or more of the threads having to do with the ECC and vacuum connections. Have you checked for collapsed nipples on the vacuum programmer?
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Old 09-04-2007, 02:23 PM   #3
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Agreed with Lash here.

If the compressor is running then you should have AC and the problem is probably not vac related.

If you don't get airflow..that'* usually vac related if you hear the fan and don't get flow where expected.
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Old 09-05-2007, 09:27 AM   #4
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I did find some crimped vac lines at the controller and fixed them. Unfortunatly, while troubleshooting the vac system, my ac clutch went up in smoke, literally. I don't know if the compressor locked down or the 160000 miles on the clutch finally caught up with it. It was a mechanical meltdown, not electrical. The car is still drivable, but the compressor is howling now. I am going to replace the compressor/clutch assembly, accumalator, dryer,oriface tube. All the AC stuff is orginial equipment. I really have grown to like this car and a dead AC is just something you have to deal with in a 12 year old car.
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Old 09-05-2007, 09:47 AM   #5
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I would be inclined to think that was the cause of your no AC issue.

The vac lines and internals shouldn't keep the AC from working. Only keep it from reaching the intended vents.
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Old 09-05-2007, 10:23 AM   #6
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I highly recommend that you not try and use your A/C until you get a new compressor in there! A mechanical compressor failure will usually load your lines with junk, bits of metal, etc. These can and will clog your condensor passages in a New York minute.
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Old 09-05-2007, 04:52 PM   #7
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Thanks for the tip. I unpluged the compressor leads and pulled the fuse just in case someone else in the house drove the car.
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