Heater
Thread Starter
Newbie
Joined: Dec 2002
Posts: 6
Likes: 0
From: UK
260e
Heater
Newbie here.
I have a 1987 260e here in the UK which happens to be LHD. It also has the optional A/C on it.
My problem is that I cannot get any heat out of the heater & its freezing in the UK at the moment.
The fan is working but only cold air comes out.
If I press the A/C button, the air gets even cooler, if I press the ECO button, the light on it is very dim & then goes out.
I don't mind if the A/C doesn't work as long as I can warm the interior of the car up !
Pls help
I have a 1987 260e here in the UK which happens to be LHD. It also has the optional A/C on it.
My problem is that I cannot get any heat out of the heater & its freezing in the UK at the moment.
The fan is working but only cold air comes out.
If I press the A/C button, the air gets even cooler, if I press the ECO button, the light on it is very dim & then goes out.
I don't mind if the A/C doesn't work as long as I can warm the interior of the car up !
Pls help
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,005
Likes: 33
From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
Hi MMARKS,
try this: pull the 3-prong plug from the so called Duo Valve under the hood. You'll find it in front of the battery, it has 2 silvery little domes. It's a valve that switches the coolant into the right and left radiator circuit of the heater. If you pull the electric plug, the valve opens completely and the heater stays on and you dont freeze but you may sweat. The problem here is that the closing mechanism gets stuck and may remain "close" position. In order to find out whethter this valve is switching just cranck the heating to full and let the car idle. Then plug and unplug 3-prong connector and listen to the switching noise of the valve. Sometime just this prodedure may solve the problem. If this does not work its either the Duo valve or the central control unit in the dash which is faulty.
Good luck and happy holidays.
try this: pull the 3-prong plug from the so called Duo Valve under the hood. You'll find it in front of the battery, it has 2 silvery little domes. It's a valve that switches the coolant into the right and left radiator circuit of the heater. If you pull the electric plug, the valve opens completely and the heater stays on and you dont freeze but you may sweat. The problem here is that the closing mechanism gets stuck and may remain "close" position. In order to find out whethter this valve is switching just cranck the heating to full and let the car idle. Then plug and unplug 3-prong connector and listen to the switching noise of the valve. Sometime just this prodedure may solve the problem. If this does not work its either the Duo valve or the central control unit in the dash which is faulty.
Good luck and happy holidays.
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,005
Likes: 33
From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
forgot one more possible cause for you freezing. I may also be the little coolant pump attached to the inside of the right fendor which feeds the Duo valve. If this is not working while burnt than no coolant arrives in the heater. This pump shall run as soon as the temperature dials in the control unit are "asking" for heating.
Thread Starter
Newbie
Joined: Dec 2002
Posts: 6
Likes: 0
From: UK
260e
Thnaks for the help, I located the "Duo-valve" and tried removing & refitting the plug a few times. The situation is now that the passenger side gets hot, the drivers side does not. When I touch the duo-valve, one side is too hot to touch, the other is warm.
The haynes manual I own is vary basic when it comes to the heating system & doesn't have any information regarding the A/C system.
Mike
The haynes manual I own is vary basic when it comes to the heating system & doesn't have any information regarding the A/C system.
Mike
