Date:         Fri, 6 Aug 2021 09:09:26 -0600
Reply-To:     OlRivrRat <OlRivrRat@COMCAST.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         OlRivrRat <OlRivrRat@COMCAST.NET>
Subject:      Re: Low Coolant Warning LED
Comments: To: "VW~DennisHaynes" <d23haynes57@HOTMAIL.COM>
In-Reply-To:  <CY4PR0801MB3731D742A5FBDB05E8AF54EFA0F39@CY4PR0801MB3731.namprd08.prod.outlook.com>
Content-Type: text/plain; charset=utf-8

Coolant Level Full @ all conditions

Wires to Snsr Disconnected & Jumped > Flashes

Wires from Snsr Ground Continuity > Good

Wires from Snsr to Relay 43 Continuity > Good

Wire from Relay 43 to Ins’ Cluster 14Pin Connector Continuity > Good

3 Traces to Gauge on PC Foil Continuity > Good

Swapped In ( now ?able ) used Gauge > Still Flashes

        Guessing @ this point that must have 2 Gauges with Same Symptoms &

Quite Actually Not Surprised @All if that is the case ~


> On 6 Aug , 2021, at 6:57 AM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> 
> The initial key on indicator test is part of the circuit in the gauge itself. There is a capacitor that controls the timing of this feature that tends to fail. The other possibility is that the low coolant sensor control is signaling the low coolant light. There are 2 versions of this controller. The early ones would short the temp sensor to ground causing the gauge to rise and the light to flash. The later units' "pulse" the sensor ground causing the light to operate with the gauge rising a minimal amount. This change allows an indication for coolant loss vs. over temperature.  
> 
> It is also possible that this could be indicating a true cooling system issue. If the system is low on coolant or air-combustion gas bound on a cold start the coolant will be pulled down from the tank causing the low coolant indication. Turning the engine off, especially with a non functioning pressure cap will allow the coolant to flow back so when checking the tank it appears full. During this light on condition leave the engine running while you check the coolant level in the pressure tank. 
> 
> Dennis
> 
> 
> 
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of OlRivrRat
> Sent: Friday, August 6, 2021 12:39 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Low Coolant Warning LED
> 
>        Could someone please explain what controls the initial Igni’ On Low Coolant Warning LED
> 
> Flash Duration ~ Have 1 that won’t stop blinking,, Have performed all the normal diag’s including
> 
> swapping in diff’ gauge ~ Am wondering if it might possibly be that what ever turns off that initial
> 
> Igni’ On Flash might be malfunctioning ~  
> 
>                                                                        ORR ~ DeanB