[W126 Coupe] Thermostat R&R for 85 500 SEC

[Shayegan, Richard]

I just noticed this is about an 85 500. Isn't the 85  500 like the 380 in that the thermostat has the pin coming out of the side? My mechanic said that unless someone cuts that pin off, you're going to get the temp changing when you stop and stuff like that (and that you also get the thing where on a cold start it'll first go up to 100 and then quickly back down to 82). He said that while people will cut those pins off its not the best idea. And he was saying this when I asked him why this was happening after I replaced my thermostat, so it's not like he was covering up for his own mistake or something.

________________________________

From: mbcoupes-bounces at mbcoupes.com on behalf of David Fatovic
Sent: Tue 12/20/2005 5:18 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] Thermostat R&R for 85 500 SEC



Bob,

All good except one thing (that I found out the hard
way).  On the water pump in my 85 the thermostat does
not sit on the side of the water pump like in later
models.  It sits on top!.  All went fine except one of
my gaskets (since I pulled the side off and didn't
need to) has failed.  I have to replace that and I am
all good.

David

--- Robert Cavazos <jazzman_390 at yahoo.com> wrote:

> David, it's been a while since I replaced one, but a
> couple of things come to mind:
>   1. Go easy on the three bolts getting them
> out--wouldn't want to snap them off.
>   2. When installing the new stat, make sure the
> little hole in it is at the 12 o'clock position.
>   3. Use anti-seize on the bolts when re-installing.
>   4. Mix the coolant & water 50/50. Don't just dump
> a gallon of  coolant in the system and then top of
> with water. And use MB coolant.
>   5. Replace the radiator cap with a proper pressure
> one. Replace any  hoses that are bulged out, or
> hard. If it's been several years, you  might want to
> consider replacing them all at this time.
>   6. Tighten the hoses. I did my wife's SL t-stat
> and all hoses but  didn't tighten them enough. Found
> most all of them all leaking when I  pressure tested
> the system later. Funny thing was there were no
> visible  leaks prior to the test.
>   7. Check the radiator level daily for the next
> week.
>
> David Fatovic <coloradocroat at yahoo.com> wrote:  I
> need to replace the thermostat in my 85.  The engine
> does not ever reach any sort of operating temp, I
> believe the thermostat is stuck open. 
>
> Is there anything I need to watch out for?  Any good
> tricks?  Anything to avoid?
>
> David
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