Early MGBs have a mechanical sensing bulb in the cylinder head, not in the
rad.
On Tue, Mar 29, 2011 at 12:02 PM, mgbob at juno.com <mgbob at juno.com> wrote:
> Aaron, If yours is an early MGB with its temperature probe in the upper
> radiator tank, being a bit low on coolant can affect the reading as the
> probe
> must be in the liquid. Later cars have the electric sender in the head,
> so
> being a pint low is unlikely to affect the reading on the gauge.Bob
>
> ---------- Original Message ----------
> From: Aaron Whiteman <awhitema at panix.com>
> To: Paul Hunt <paul.hunt1 at blueyonder.co.uk>
> Cc: MG Mailing List <mgs at autox.team.net>
> Subject: Re: [Mgs] you know you need a proper stat when...
> Date: Mon, 28 Mar 2011 19:40:06 -0700
>
> On Mar 28, 2011, at 12:58 AM, Paul Hunt wrote:
>
> > 160 and 180 are about 1/4" apart on the temp gauge. If your gauge never
> or
> barely got off the end-stop then the stat that is in is faulty, pure and
> simple. I agree that changing to a 'summer' stat is pointless, in most
> MGBs
> the stat will be fully open anyway regardless of its value.
>
> Eep! So it's not the thermostat after all.
>
> I pulled it tonight and it says "88*" on the side. Since it's a german
> brand,
> I assumed 88C, which is 190F. Using the pan-o-water testing method, I
> verified it opened at 86C and closed correctly too.
>
> I noted that when I put the coolant back in, it wasn't quite reaching the
> top
> of the core, so I added some more. Maybe a pint, probably less. Would
> this
> be enough to cause erratic readings? I'll be doing the "drive some, stop
> and
> check temp, drive some more, repeat" process soon enough. Glad I have that
> infrared thermometer!
>
> --
> Aaron
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