'Engine Water' light flickering

[dave stragand1]

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

 

[Jim Hupy]

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 <

> 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
>

 

[Matt Colie]

> 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 - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit

 

[Larry Davick]

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

 

[Ken B]

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

 

[jim kanomata1]

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 <

> 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
>
> _______________________________________________
> 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
http://www.appliedgmc.com
1-800-752-7502

 

[dave stragand1]

Thanks to all who replied with suggestions! It indeed was simply a
loose connection at the switch.

-Dave
1978 Transmode near Pittsburgh