I'm starting to think a (still) dirty connection. Car sits for a week, temp 
gauge skyrockets, car gets driven 4 days in a row, temp gauge moderates but is 
still high.

I'll clean it better tonight, if Fred provides another temp sensor and I try my 
spare gauge cluster that should give me an idea.

-Curt

Date: Mon, 13 Aug 2012 14:40:28 -0500
From: Fmiser <fmi...@gmail.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] High temp, bad sender?
Message-ID: <20120813144028.378ccc72.fmi...@gmail.com>
Content-Type: text/plain; charset=US-ASCII

> Curt Raymond wrote:

> Rats, I was hoping for an easy answer.

I would be quite surprised if the metal next to the temp sensor
was a different temperature than the sensor.  So using your IR
thermometer you should be able to prove the accuracy of the
in-car measurement.

> Its a resistance device? I should be able to take a reading
> there. It'd be awesome if the FSM had a chart. I'll need to
> find my copy of the FSM.

Most likely it's just resistance. Here it can get tricky.  Is it
a ground?  The gauge?  The sender? 

Do you have a parts car?   Without a manual that documents the
values it becomes a parts swap process.

--   Philip

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