> 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!