Mercedes w124 300d help
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Mercedes w124 300d 1989
Mercedes w124 300d help
Cant find anywhere my problem
so i have a w124 300d 1989 and there is absolute no climate control working nothing on the center console(non A/C version)i tested the fan and it works great i changed the relay/resistor what ever it is under the windshield and nothing when i put the multimeter says 0 volts on all 4 fan speeds?what can i do im going crazy iv been trying to fix it the last 2 weeks...(i checked all fuse good)and sorry if i made mistakes in writing im trying my best
so i have a w124 300d 1989 and there is absolute no climate control working nothing on the center console(non A/C version)i tested the fan and it works great i changed the relay/resistor what ever it is under the windshield and nothing when i put the multimeter says 0 volts on all 4 fan speeds?what can i do im going crazy iv been trying to fix it the last 2 weeks...(i checked all fuse good)and sorry if i made mistakes in writing im trying my best
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Joined: Jan 2015
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From: Worcestershire UK
W124 260E
Ivan can you post a picture of your console for the heater control .I dont understand weather you have air con or not . Or do you have the normal heater as standard in most models .
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Mercedes w124 300d 1989
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Mercedes w124 300d 1989
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Super Member
Joined: Jan 2015
Posts: 920
Likes: 46
From: Worcestershire UK
W124 260E
Looks like only fuse is in the fuse box ,,and you know about that one . I will see if the heater runs through a relay .
You could switch it on and chech if the heater blower moter is receiving the 12 volts . If it is then the brushes in the cage motor is toast also - No relay involved .
You could switch it on and chech if the heater blower moter is receiving the 12 volts . If it is then the brushes in the cage motor is toast also - No relay involved .
Last edited by optimusprime m1; Apr 27, 2020 at 04:55 AM.
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Super Member
Joined: Jan 2015
Posts: 920
Likes: 46
From: Worcestershire UK
W124 260E
...The power to the havc is taken right from the ignition switch .So switch the heater on and waggle the key see if it starts the heater motor . Do check the fuse in the fuse box again and as a secondry change heater fuse over for another .If these are white metal type they all need thrownig away and changing for copper and ceramic like they sell in the boat chandelers .Check the power at the number 7 fuse in the fuse box for heater motor .
Last edited by optimusprime m1; Apr 27, 2020 at 05:46 AM.
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Mercedes w124 300d 1989
Gonna try
...The power to the havc is taken right from the ignition switch .So switch the heater on and waggle the key see if it starts the heater motor . Do check the fuse in the fuse box again and as a secondry change heater fuse over for another .If these are white metal type they all need thrownig away and changing for copper and ceramic like they sell in the boat chandelers .Check the power at the number 7 fuse in the fuse box for heater motor .
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Mercedes w124 300d 1989
Super Member
Joined: Jan 2015
Posts: 920
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From: Worcestershire UK
W124 260E
The ignition switch as a lot of contacts inside . And it is used for the heater system hot wire . You will have to trace back to find the problem.. Ask the chap who you had the car off if he did anything .Ave you a wiring diagram ? If not i can take a picture of diagram from my manual and post it up on hear for you.
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Mercedes w124 300d 1989
The ignition switch as a lot of contacts inside . And it is used for the heater system hot wire . You will have to trace back to find the problem.. Ask the chap who you had the car off if he did anything .Ave you a wiring diagram ? If not i can take a picture of diagram from my manual and post it up on hear for you.
Super Member
Joined: Jan 2015
Posts: 920
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From: Worcestershire UK
W124 260E
Ivan can tou see that plug thing above the duovalve open it up see whats inside it .I dont think this will help you ,,,i am searching
Last edited by optimusprime m1; Apr 30, 2020 at 04:50 AM.
Super Member
Joined: Jan 2015
Posts: 920
Likes: 46
From: Worcestershire UK
W124 260E
Ivan save a lot of time and get in and check out that ignition awitch. To rule out that you just might have a wire off or a birds nest of wires under there , A few guys on the forum have had ignition switches go down after finding heater is no longer working . Your sure that you put voltage to the squirrel cage and it did work .. auto electric fitters use the ignition switch to fit the alarm to the car and might have knocked a wire off .
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Mercedes w124 300d 1989
Ivan save a lot of time and get in and check out that ignition awitch. To rule out that you just might have a wire off or a birds nest of wires under there , A few guys on the forum have had ignition switches go down after finding heater is no longer working . Your sure that you put voltage to the squirrel cage and it did work .. auto electric fitters use the ignition switch to fit the alarm to the car and might have knocked a wire off .
Super Member
Joined: Jan 2015
Posts: 920
Likes: 46
From: Worcestershire UK
W124 260E
Why do you need to fit the speedo cable ,,,whats wrong ewith the one you have,,, or is it that it is missing ? Well this is fitted to the rear of the speedo clock console you pull the whole lot out from the dash with the help of a pair of hooks the other end of the cable screws to the spigot on the gearbox . And yes the bottom of the dash needs removing to get in to the switch from the below Lot of info on how to do both these jobs will be on youtube in video form to help you see how it is done.
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Mercedes w124 300d 1989
Why do you need to fit the speedo cable ,,,whats wrong ewith the one you have,,, or is it that it is missing ? Well this is fitted to the rear of the speedo clock console you pull the whole lot out from the dash with the help of a pair of hooks the other end of the cable screws to the spigot on the gearbox . And yes the bottom of the dash needs removing to get in to the switch from the below Lot of info on how to do both these jobs will be on youtube in video form to help you see how it is done.
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Mercedes w124 300d 1989
What a mess
Wires hanging and lead to nowhere
There is a cable going as well nowhere on left that with a head cable
So bouch of electrial tape thats the connector to the igniton switch whats next do i have to drop the stering to be able to disconect it?
And here is someones rust repair but more importat again wires splited and 2 wires going to the back of the car dont know where hoprfully not important.And there is a dashlight bulb with a blue wire going nowhere just hanging cable cut off cant find where its suppose to go
Thread Starter
Newbie
Joined: Apr 2020
Posts: 13
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Mercedes w124 300d 1989
Wires hanging and lead to nowhere
There is a cable going as well nowhere on left that with a head cable
So bouch of electrial tape thats the connector to the igniton switch whats next do i have to drop the stering to be able to disconect it?
And here is someones rust repair but more importat again wires splited and 2 wires going to the back of the car dont know where hoprfully not important.And there is a dashlight bulb with a blue wire going nowhere just hanging cable cut off cant find where its suppose to go
Super Member
Joined: Jan 2015
Posts: 920
Likes: 46
From: Worcestershire UK
W124 260E
Ivan you need the help of god to sort that out . Whats the rest of the car like ? I wouild say some one was playing in there and damaged most of the wires .Where they go is any ones guess .It will need a good elecronics guy to sort it out if you dont sort it will be a fire hazard . Or spend and get a good schematic diagram on the wire layout . Wish i could help you in some way .
Thread Starter
Newbie
Joined: Apr 2020
Posts: 13
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Mercedes w124 300d 1989
Ivan you need the help of god to sort that out . Whats the rest of the car like ? I wouild say some one was playing in there and damaged most of the wires .Where they go is any ones guess .It will need a good elecronics guy to sort it out if you dont sort it will be a fire hazard . Or spend and get a good schematic diagram on the wire layout . Wish i could help you in some way .
