Sounds like thermostat has failed open.

Ken

On Fri, Jan 21, 2022, 3:04 PM Mark McCulley <markmcculley@gmail.com> wrote:

> This is a weird one.
>
> Coolant gauge started going LOWER while driving at 65mph for 30 min.
> Pulled over to check it out, by then gauge was like it was a cold engine.
>
> -GW expansion tank is full.
> -One of the 2 hoses from engine to radiator is cold.
> -Radiator is cold.
> -No coolant leaking.
> -Oil looks good
> -I opened bleed screw on radiator and no air, just coolant.
>
> After stopping 10 minutes I started van and temp came up to normal and
> radiator got hot. Then a get running a few minutes the temp gauge went back
> down.
>
> I recently had the entire cooling system renewed, new everything.
>
> I have the rear heater core out and both hoses are plugged
>
> Ideas?
>
> -Mark
> 87 Westy
>
>
>
> Sent from my iPhone