300D no heat anyone have an idea

johnjzjz · 02-06-2009, 08:18 PM

after the car warms up the heat starts to work than stops and goes cold, sometimes pressing defrost and back to ecom, it will get warm than it goes cold again and wont work again till the car is shut off and re started ???? anyone

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DENIS'S 300SDL · 02-07-2009, 02:04 AM

probably one of the relays. this happened to my 1982 300d, but i dont remember which relay i changed. It works ever since.

Untertürkheim · 02-07-2009, 04:37 AM

Could it be the monovalve?

240D 3.0T · 02-07-2009, 05:10 AM

Could be the monovalve or the electric coolant pump.

johnjzjz · 02-09-2009, 08:18 AM

thanks going after it today - jz

milkman.dan · 03-18-2009, 05:10 PM

Quote:

Originally Posted by johnjzjz

after the car warms up the heat starts to work than stops and goes cold, sometimes pressing defrost and back to ecom, it will get warm than it goes cold again and wont work again till the car is shut off and re started ???? anyone

I have sort of the opposite problem. I will get burning hot air when the A/C system is set to just blow outside air in with no compressor running. Sometimes it will blow ambient temperature air, other times, no matter what it blows very hot air. The monovalve is very recent, less than a year or so old. If it's a relay of some sort, any one know which one? I have a few spares from another W123 I could try.

Jakew903 · 03-23-2009, 01:11 AM

Sounds like a MonoValve to me.

tanktube67 · 05-23-2009, 03:46 PM

you could get a repaired kit.

http://www.buymbparts.com/

05-23-2009, 03:46 PM	#8
tanktube67 MBWorld Fanatic! Garage is empty, add now Join Date: Nov 2007 Location: SFV CA Posts: 4,424 Drives: 2008 Black Out C350 Saks Edition / 87 VW GTI	you could get a repaired kit. http://www.buymbparts.com/ __________________ . Powerchip ECU tune K&N Filters Black Out window & trunk molding/ by JS Design Factory Black Out side marker lamps Black Out Grill Tint tail lights "cherry red" C63 OEM wheels on Pzero tires 35% window tint H&R Spring Euroteck CF front lip DDM 6000K HID kit Custom quad exhaust by Royal Mufflers http://www.mbworld.org/forums/c-clas...quad-tips.html

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02-07-2009, 02:04 AM	#2
DENIS'S 300SDL Newbie Garage is empty, add now Join Date: Nov 2008 Location: Sacramento, CA Posts: 2 Drives: 1987 300sdl, 1993 300sd, 1993 300d 2.5 turbo, 1966 200d, 1985 300sd	probably one of the relays. this happened to my 1982 300d, but i dont remember which relay i changed. It works ever since.

02-07-2009, 04:37 AM	#3
Untertürkheim MBWorld Fanatic! Garage is empty, add now Join Date: Mar 2007 Posts: 2,408	Could it be the monovalve?

02-07-2009, 05:10 AM	#4
240D 3.0T Banned Garage is empty, add now Join Date: Apr 2006 Location: Federal Heights, CO Posts: 1,116 Drives: 1982 300D VNT, 1980 240D 3.0T, 1982 300TD	Could be the monovalve or the electric coolant pump.

02-09-2009, 08:18 AM	#5
johnjzjz Junior Member Garage is empty, add now Join Date: Jan 2009 Posts: 26 Drives: E420	thanks going after it today - jz

03-23-2009, 01:11 AM	#7
Jakew903 Member Garage is empty, add now Join Date: Mar 2009 Posts: 100 Drives: ...	Sounds like a MonoValve to me.

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