i've a 84 240d euro. The heater won't work. Many of you are familiar with this easy system. THERE IS Nothing to it. The center dial turns on the blower, and it works. The 2 outer,rt and left dials open and close the heater valve on the fire wall to allow radiator fluids into the heater. It operates by a simple wire that pulls and pushes the heater valve open and closed. They work. The 2 vent control valves are operated by wire control like the heater valve. They work.

The reason I'm in here is some jerks ripped the CD player out of my son's car and tore the console and housing to pieces. I'm replacing and rebuilding it. They ripped the speaker wires off all the way to the speakers.

I'm lost as to why the heater doesn't work. back with more pics RAY M

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I think it about has to be that valve...think it could be broken INSIDE where you can't see it?

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Mark
1983 300TD Wagon
Even a broken watch is right twice a day

http://www.peachparts.com/shopforum/showthread.php?t=209803

My apologies I mistakenly started a new post (link above) instead of posting another thread to this post. See ABOVE. I have another valve and if it's warmer that is the next thin i'll check. The radiator fluid line is cold when the valve is open on the rt or left side. the line thet leads to the back of the block that comes out of the fire wall to the drivers side is hot. Which way does the coolant flow through the lines. Does it enter at the valve or exit at the valve.

I believe it enters the heater thru the line at the back of the block on the drivers side and exits thru the valve. Seems backwards and it cause me no end of trouble when doing a similar job on my 240D.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

Was it the valve that was broken or stuck. the line is cold from the valve to the return by the thermostat.

I removed the valve and it works. Any leads on where to go next. Ray

Is coolant flowing through the heater core? Or is air being diverted around instead of through the heater core?

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

I removed the hose to the valve while the car was idleing and the valve was open and no flow. I removed the inlet hose and no flow. I decided to rev the engine up a bit and got a circulating flow and got heat. Evidently on this system there is no circulation when in idle. That is how I was testing it, at idle. I wasted a lot of time not knowing this. I have heat and learned something so not all is lost. I hope this will help others. RAY M

Seems to support Mercedes decision to install an axillary electric coolant pump for the heater.

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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

I have heat in my 84 Euro 240D at idle.

Is it possible that there is an air bubble in your cooling system and the system is not full of coolant? I had NO heat in a TR4 on a long drive once in dead of winter ... at a gas stop I opened the rad cap & topped off the coolant --- was 'way down ... on the way out of the station I had tons of heat. I interpreted this as not enough coolant to be forced up & through the heater box.

That could have been It. Because a failed water pump would cause it to overheat all the time I would think. It's not real cold in Louisiana. I did add coolant after loosing some when removing the hoses to check the flow volume. Thanks for everyones help. RAY M

IN a system so simple that could add to possible problems the didn't want on this model. I don't know why there isn't an axillary electric coolant pump for the heater. Does anyone know why there isn't one. This is a Euro. Ray

Yep, 240's didn't come with them....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John