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Car Forum / Mercedes-Benz Cars / December 2004

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removal of the center console

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pool man - 16 Dec 2004 01:36 GMT
ON MY 300SD <82>
managed to get every thing loose
ash tray out along with the radio.
WHERE is the ONE bolt that holds down the back end of it < the rear AC
VENT end >
also does the shifter knob need to come off?

as you may have guessed i am still working on the heater <lack of heat>
most of the time.

symptom now is it blows hot then cools after a few mins.
if you turn the car off and right back on it blows hot then goes to cool
once again.
checked the servos behind the glove box and they move as they should.
to me it sounds like one of them is run not by vacuum but by a motor
hiding some where behind the console.

the last time i opened the front <another car> i bunched the console up
and do not want to do that again.

the case, minus a few cans!
Tiger - 16 Dec 2004 05:13 GMT
Dude! If you idle for a long time in your driveway, will the heater blow
hot? If yes, then your heater core is fine. When you start moving, does your
heater get colder? More details please!
The earnest one - 19 Dec 2004 05:23 GMT
> Dude! If you idle for a long time in your driveway, will the heater blow
> hot? If yes, then your heater core is fine. When you start moving, does
> your heater get colder? More details please!

I have an '81 300D which does exactly the same thing...blows warm air for
less than a minute then begins cooling down rapidly. It acts as if the hot
water circulation pump works only at startup and then almost immediately
shuts off.
I can turn the climate control off and back on and the same thing
occurs...warm air for 15-20 seconds, then cool air once again. Any serious
suggestions?
Tiger - 19 Dec 2004 13:41 GMT
Ahh... you got that dreaded servo... my suggestion is to clean all the
contacts on that servo in the engine bay... make sure clean and good
contact.

If you don't want to spend money for a rebuilt one, then you can build a
contraption that bypass that servo and put a valve so you can control the
amount of constant heat.
pool man - 19 Dec 2004 16:37 GMT
tiger your speaking of the water valve right?

the case, minus a few cans!
Tiger - 20 Dec 2004 00:43 GMT
Those older one got those monster water valve... costing a whopping $300 for
a rebuilt one... you might be able to get one for $200 or so...

They are not the simple dinky stuff we got... but durable!
Central Florida - 20 Dec 2004 02:01 GMT
What Tiger is referring to is to disconnect the water hose that comes from
the engine where it goes into the servo. Install some type of shut-off valve
at that point. Disconnect the hose that attaches to the servo and goes into
the firewall and connect it to the other side of the shut-off valve. You
just replace the servo with the shut-off, you just by-pass the servo unit.
The water comes from the engine, through the shut-off valve, then into the
heater. When it's cold outside, open the valve to allow water (hopefully
hot) to flow through the heater. When it's hot outside, turn off the valve
to keep water from flowing to the heater. You are now the cabin thermostat.

Larry
In the back yard, under the oak.
pool man - 20 Dec 2004 02:51 GMT
hate to sound dumb but the electric valve & the servo are the same
thing?

also i have the main inlet hose and 4 outlet hoses <one or 2 i believe
are the return>

2 small ones that feed the top of the fire wall & the others under the
electric valve.
i know the one to put the valve on comes from the front of the block by
the water pump.

GOD i need to find a service manual

the case, minus a few cans!
Tiger - 20 Dec 2004 21:06 GMT
His servo is not the same as our Monovalve Pool Man.
pool man - 21 Dec 2004 00:53 GMT
good  !
maybe the mono valve is cheaper

the case, minus a few cans!
pool man - 20 Dec 2004 01:38 GMT
Tiger,
god i hope not 300.00

well i now have heat, REALLY!

the water valve had a rip in the gasket.
i just pulled the little C clip off and removed the piston that the
magnet pulls up and down.
now it is open and the feet are happy
along with every one else.

the water valve  in my car has the 4 screws & the plug on the top.

the screws go into the plastic body of the valve & can be stripped so
make sure every thing is lined up good first.

the auto still runs the fan properly so its not an open window event
from to much heat.

i thought the valve could be rebuilt?

also what are the 2 small hoses for that stick out if the top of the
fire wall
they also have coolent in them as i had to remove the one on the pass
side to get one of the screws out?

the case, minus a few cans!
Karl - 16 Dec 2004 05:46 GMT
What year is your 300SD???  That will tell us your body #!

> ON MY 300SD <82>
> managed to get every thing loose
[quoted text clipped - 17 lines]
>
> the case, minus a few cans!
Tiger - 16 Dec 2004 14:31 GMT
His is 82
pool man - 16 Dec 2004 19:34 GMT
makes no difference on speed or RPM
.
i can be driving down the road turn the key off then back on. it then
blows hot once again.

i just want to see if something is moving servo wise and unless i find
that bolt i can't do that..

also what color is the vacuum line that goes through the fire wall for
the heat & AC.

AC works fine in the summer

the case, minus a few cans!
Helen - 17 Dec 2004 23:29 GMT
"Driving down the road and turn the key off..."?  WHOA!  Mine stops dead when
the key is turned off.  LOL! How do you manage this feat?   (Rhetorical question).

> makes no difference on speed or RPM
> .
[quoted text clipped - 10 lines]
>
> the case, minus a few cans!
pool man - 18 Dec 2004 04:53 GMT
the blower stops but the car keeps rolling
was told the mono valve is going bad.

unplugged it and its warmer. am waiting for one next week!

the case, minus a few cans!
pool man - 17 Dec 2004 00:33 GMT
well unplugged <electric> the mono valve and now have heat,

guess i will be getting one tomorrow.

my right foot is so happy now!!!!!

the case, minus a few cans!
 
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