There's no real way to test the thermostat while it's still installed. You could remove it, visually inspect it to make sure it's closed all the way, then put it and one of those candy thermometers in a pan of water on a stove, and set the burner to get the water boiling. See at what temperature it begins to open.
OR, just save all that trouble and install a new thermostat.
Mark in Lakewood, CO
From: "CaitlinDean" <tinymachine@gmail.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Monday, December 5, 2011 7:17:40 PM
Subject: [diesel_mercedes] Re: Cold Startin'...glow plug relay "clunk"
From: "CaitlinDean" <tinymachine@gmail.com>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Monday, December 5, 2011 7:17:40 PM
Subject: [diesel_mercedes] Re: Cold Startin'...glow plug relay "clunk"
--- In diesel_mercedes@yahoogroups.com, "Mark in Lakewood, CO" <beeser750@...> wrote:
> Valve adjustment won't help the warm-up time. Of all the cars I've owned, the dozen or so MB's distinguished themselves for being fast warmer-uppers, so, something is amiss here. Has the thermostat been checked/changed recently?
Coolant is dirty and tired...desperately needs a flush...could that have anything to do with it? No idea on the thermostat itself, is there a way for me to check it? I know those are fairly inexpensive...it's on my list of things to do just so I KNOW when it's "new", but it's farther down the list.
Caitlin, Santa Fe
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