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[GMCnet] 'Engine Water' light flickering [message #348094] Wed, 18 September 2019 12:46 Go to next message
Dave Stragand is currently offline  Dave Stragand   United States
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Registered: October 2017
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Senior Member
Hi All,



When my coach is running, the 'Engine Water' light (coolant level) will
often flicker on and off. The actual level of coolant in the radiator
is fine. My guess to the most likely cause is the coolant level sensor,
which at $10 or less seems worth trying. Does anyone have any
suggestions?



-Dave

1978 Transmode near Pittsburgh

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1978 Transmode (403) Pittsburgh, PA

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Re: [GMCnet] 'Engine Water' light flickering [message #348096 is a reply to message #348094] Wed, 18 September 2019 13:07 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
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Senior Member
The guru of Chemicals might have some input on the conductivity of various
concentrations of anti-freeze. You might have a problem with the additive
package, or, you might have a problem with the sensor electronics in the
warning light circuitry.
Jim Hupy
Salem, Oregon

On Wed, Sep 18, 2019, 10:47 AM Dave Stragand via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Hi All,
>
>
>
> When my coach is running, the 'Engine Water' light (coolant level) will
> often flicker on and off. The actual level of coolant in the radiator
> is fine. My guess to the most likely cause is the coolant level sensor,
> which at $10 or less seems worth trying. Does anyone have any
> suggestions?
>
>
>
> -Dave
>
> 1978 Transmode near Pittsburgh
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: [GMCnet] 'Engine Water' light flickering [message #348099 is a reply to message #348094] Wed, 18 September 2019 14:34 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
Senior Member
Dave Stragand wrote on Wed, 18 September 2019 13:46
Hi All,

When my coach is running, the 'Engine Water' light (coolant level) will often flicker on and off. The actual level of coolant in the radiator is fine. My guess to the most likely cause is the coolant level sensor, which at $10 or less seems worth trying. Does anyone have any suggestions?

-Dave
1978 Transmode near Pittsburgh
Dave,

I have known this to be the connection to the probe in the tank getting bad. Before you do anything rash, pull the wire off the probe and clean both.

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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Re: [GMCnet] 'Engine Water' light flickering [message #348102 is a reply to message #348094] Wed, 18 September 2019 16:56 Go to previous messageGo to next message
ljdavick is currently offline  ljdavick   United States
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Registered: March 2007
Location: Fremont, CA
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I recall that mine would also flicker on a cold start but go away after the engine warmed up. This was before I had the radiator re-cored. I have not noticed it since. This may suggest a bad connection that was inadvertently repaired when I reinstalled the radiator.

Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy

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Re: [GMCnet] 'Engine Water' light flickering [message #348113 is a reply to message #348094] Thu, 19 September 2019 02:50 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
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Registered: January 2004
Location: Hebron, Indiana
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If I remember correctly that sensor is nothing more that a brass or steel probe sitting in the water / coolant. I will go with the others here and say your problem is the wire going to it or the connection.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] 'Engine Water' light flickering [message #348124 is a reply to message #348113] Thu, 19 September 2019 10:03 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
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Registered: July 2006
Location: Belmont, CA
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Crimp the slide on socket gently.
When it flickers on senders, I say connection is the issue.

On Thu, Sep 19, 2019 at 12:50 AM Ken Burton via Gmclist <
gmclist@list.gmcnet.org> wrote:

> If I remember correctly that sensor is nothing more that a brass or steel
> probe sitting in the water / coolant. I will go with the others here and
> say your problem is the wire going to it or the connection.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.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] 'Engine Water' light flickering [message #348446 is a reply to message #348124] Mon, 23 September 2019 14:53 Go to previous message
Dave Stragand is currently offline  Dave Stragand   United States
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Registered: October 2017
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Thanks to all who replied with suggestions! It indeed was simply a
loose connection at the switch.

-Dave
1978 Transmode near Pittsburgh

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