Home » Public Forums » GMCnet » Re: [GMCnet] Inoperative Quad Airbag system
| Re: [GMCnet] Inoperative Quad Airbag system [message #360980] |
Sat, 19 December 2020 12:23  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Don't blame the bag system.
There is a great chance the solenoid valves might have a piece of rust from
the air tank .
On Sat, Dec 19, 2020 at 10:14 AM Kenneth Doyle via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My 1975 GMC has a quadbag system installed by Jim Bounds many years ago. It
> has never given me any problems except for some leakage, generally taking a
> couple of days or longer to leak down.
>
> I had some engine and other miscellaneous work performed this past week.
> Improvements included wiring the radio to the ignition switch, which had
> previously been wired to the house battery. The horn relay was also
> replaced and a new horn was installed. Also some carburetor work. But no
> work was performed on the airbag system. It was working normally.
>
> I drove it home with the bags inflated, but the next morning the bags were
> deflated on both sides. When activated, the system would not raise the
> coach. or inflate the bags. The air compressor operates to fill the air
> tank. I tried to inflate the bags, on both sides, at the air value next to
> the system shutoff valves (at the wheels). Neither side would inflate. The
> end shut-off valve was closed, the two valves leading to the bags were
> open. The airbag air gauges on both sides of the coach would register 75lbs
> of pressure, and hold that pressure, unless the end shut-off valve was
> opened.
>
> What would cause the system to totally fail in this manner? Could one of
> more sensors be out, or was electrical power severed to the system that
> during the horn and radio rewiring? Suggestions welcome.
>
> Thanks,
>
> Ken Doyle
> 1975 Glenbrook
> SE Kansas
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Inoperative Quad Airbag system [message #360981 is a reply to message #360980] |
Sat, 19 December 2020 13:26  |
Kenneth Doyle
Messages: 9
Registered: September 2020
Karma: 0
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Junior Member |
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Jim,
I'm a big fan of the airbags themselves.
I'm assuming there are two solenoid valves, one for each side. It is
certainly possible that the airtank has released rust, etc., through the
system. The tank is old and doesn't hold pressure as well as it used to. In
fact, I'm not sure it's even pumping up more than 80psi at the moment. It
may need to be replaced too. Is there a way to clean the solenoid valves,
or do they need to be replaced?
Thanks,
Ken
On Sat, Dec 19, 2020 at 12:24 PM Jim Kanomata via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Don't blame the bag system.
> There is a great chance the solenoid valves might have a piece of rust from
> the air tank .
>
> On Sat, Dec 19, 2020 at 10:14 AM Kenneth Doyle via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> My 1975 GMC has a quadbag system installed by Jim Bounds many years ago.
> It
>> has never given me any problems except for some leakage, generally
> taking a
>> couple of days or longer to leak down.
>>
>> I had some engine and other miscellaneous work performed this past week.
>> Improvements included wiring the radio to the ignition switch, which had
>> previously been wired to the house battery. The horn relay was also
>> replaced and a new horn was installed. Also some carburetor work. But no
>> work was performed on the airbag system. It was working normally.
>>
>> I drove it home with the bags inflated, but the next morning the bags
> were
>> deflated on both sides. When activated, the system would not raise the
>> coach. or inflate the bags. The air compressor operates to fill the air
>> tank. I tried to inflate the bags, on both sides, at the air value next
> to
>> the system shutoff valves (at the wheels). Neither side would inflate.
> The
>> end shut-off valve was closed, the two valves leading to the bags were
>> open. The airbag air gauges on both sides of the coach would register
> 75lbs
>> of pressure, and hold that pressure, unless the end shut-off valve was
>> opened.
>>
>> What would cause the system to totally fail in this manner? Could one of
>> more sensors be out, or was electrical power severed to the system that
>> during the horn and radio rewiring? Suggestions welcome.
>>
>> Thanks,
>>
>> Ken Doyle
>> 1975 Glenbrook
>> SE Kansas
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Inoperative Quad Airbag system [message #361006 is a reply to message #360981] |
Sun, 20 December 2020 08:25 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Kenneth Doyle wrote on Sat, 19 December 2020 14:26Jim,
I'm a big fan of the airbags themselves.
I'm assuming there are two solenoid valves, one for each side. It is certainly possible that the airtank has released rust, etc., through the system. The tank is old and doesn't hold pressure as well as it used to. In fact, I'm not sure it's even pumping up more than 80psi at the moment. It may need to be replaced too. Is there a way to clean the solenoid valves,or do they need to be replaced?
Thanks,
Ken
Ken,
The system is well described in the X7725 manual.
There are not two solenoid valves, but six and any of two per side could cause the that side to leak down. Of those I have had apart, they are serviceable, but they required a special two pin spanner. I have no reason to suspect the GM used that same supplier for all the Electro-level systems.
You will probably have to break up the valve cluster to get the access required.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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