Max Air Vacuum Motor for 72

pjconn72 · Posted: Tue Oct 30, 2007 8:58 pm Post subject: Max Air Vacuum Motor for 72

I am repairing the A/C on my 72 el Camino. The new setup works well, but does not kick into high cool in the HI switch position. The relay has been replaced. I am told I need to replace the Max Air Vacuum Motor, which has the effect of recirculating cooler air within the cab.

Has anyone experienced this problem before? Where can I obtain a replacement motor?

Thanks - I am new to this impressive site.
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Paul Connealy

CANTED · Posted: Sat Nov 03, 2007 11:09 am Post subject: hi fan

What happens when you put it on high? Does the fan go off? If so it is still a electrical problem. If the fan runs on high but the desired airflow is the problem, then the vacuum pod could be at fault.
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Jim
70 ElCamino 461 solid M20 331eaton
http://elcaminocentral.com/gallery-album_album346.html

pjconn72 · Posted: Sat Nov 03, 2007 2:31 pm Post subject: Max Air Vacuum Motor

Thanks for the response. As I understand the problem, on MAX, the inside air (recirculated air) is directed around the heater core and through the A/C outlets. Whatever mechanism closes out the outside air to allow the inside air to recirculate is not functioning properly. The A/C and fan work on MAX, but recirculation is not occuring. Again, I have been informed that a motor called the MAX air vacuum motor is the culprit. Is anyone familiar with this problem and is there a GM part number for it?

Also, if there is another cause, I will appreciate any and all advice.

Thanks,
Paul
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Paul Connealy

CANTED · Posted: Sat Nov 03, 2007 8:40 pm Post subject: a/c

I worked on mine not too long ago, Paul. This is what appears to happen on mine. When you move the selector to max, the pod that you can see in the cowl near the right wiper closes off the cowl area. There is also one behind the right kick panel that opens to draw air from that area. There is also a blend door in the air box that is vacuum operated. This door changes position with different selections and it has seperate position when max is selected. Hope that helps.
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Jim
70 ElCamino 461 solid M20 331eaton
http://elcaminocentral.com/gallery-album_album346.html

dougs85 · Posted: Sat Nov 03, 2007 10:24 pm Post subject:

A vacuum motor is not a motor in the real sense. It works more like a solenoid but is vacuum operated. You might even be able to buy one at a GM dealer. Take your old one in and see if they have one that will replace it. The other option might be a junk yard. The one you need is probably under the dash of several GM models.....Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
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Bowtie70SS · Posted: Thu Nov 08, 2007 8:00 pm Post subject:

Try www.oldairproducts.com they have lots of stuff for old air conditioning systems. They are reasonable and in some cases the only game in town.

Dave
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70 Chevelle SS (clone)
70 Elcamino SS396 (for real)
03 Silverado SS

What can I say I like Super Sports!