gentlemen,
love this forum, lots of good practical info. thank you.
concerning an '82 300td, w/ fresh ac recharge, i count 5 vacuum operated doors; all working properly, electric water valve; working,
here's my question: why does my ac work fine until the climate control shuts it down. once it shuts down, it just gets warmer and warmer. the condensor (isn't that what they call the thing in the heater box that gets cold?) is still extremelly cold. is there another door that i can't find or does the air run through the heater core and condensor all the time?
thank you, db (ben's dad)

I don't think there are any simple ac questions myself...

The thing inside the box is the evaporator... where liquid refrigerant is let out in a spray and changes to vapor... adsorbing heat.... thus cooling fins...

It sounds like maybe the sensor on the dash,,,if you have one,,, might be dirty... and thus not responding quickly enough...

There are other things which can be going on ...so you may have to do more describing for us to be able to narrow it down...

The problem may very well be that the foam hose behind the glove box that draws air across the temp sensor in the middle of the dash has disintegrated. Pull the glove box and look. If it is gone, get a section of foam hose from home depot. It is what is used to insulate pipes in the winter time.

Good luck,

evaporator? cool!!, hose was replaced, i observed that my heat never really stops even with it off or in economy, maybe that electric valve isn't as good as i thought?

Or maybe the vacuum regulated flap which is supposed to change your airflow from heater core to evaporator core is defective ?

Sounds like the mono valve is a problem. Get a rebuild kit and replace it.

dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

dmorrison is right here. It sounds like your monovalve diaphragm is torn/leaking. It's a common occurance and is inexpensive to fix. Just go to Fastlane at the top of the page and Phil can hook you up.

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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ah, 12 is nowhere near 80.00/lb.
more like 10 or 15 max.
get it online.
John

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

unfortunately, that is the price quoted to me today at an ac service facility. if I remember correctly, dont you need a special permit to purchase r-12?

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Fantom71 aka Dale
Madison, AL

91 190E 2.6 5 speed 220k miles and this car still scoots!

you are supposed to have one, but online they do not request it. if you need one, just go online and get certified, it costs 15.00 and it's an open book test.
John

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

if the facility is trying to charge 80.00/lb, they don't want to do the work.
John

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks for the info on the freon, but do you have any suggestions about if the mono-valve failure could cause the ac to act the way that I reported?

Thanks again,
Dale

__________________
Fantom71 aka Dale
Madison, AL

91 190E 2.6 5 speed 220k miles and this car still scoots!