help with temp sensor
Thread Starter
Newbie
Joined: Oct 2004
Posts: 5
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From: New York, USA
1991 190E 2.3
help with temp sensor
Someone on the forum wrote in an issue related to the electromegnetic fan not working probably:
"With the car not running and cold, I went ahead and shorted the magnetic clutch connectors with jumper wires to the battery and was met with a sweet "CLICK!" The fan clutch held very firm as well- so I can rule out the magnetic clutch itself."
I know I sound very naive but what do you connect the wires from the battery to the fan or sensor to check the clutch like he did? I mean you have the red wire positive and the black negative coming from the battery. And then there is the sensor with three poles and two wires running into the fan. One wire with a head with two hole goes on the poles that are next to each other and one wire has one head with only one wire for the pole by itself. So if I wanted to chech the clutch like that person did which wire from the battery would I run and to which head (wire) or pole would I run that into? Also I read here in the forum a lot of people talking about hard wiring the temp sensor for the electromagnetic fan to work all the time. I still don't know how would that be done. I mean do you connect the poles to each other and wich ones. The ones next to each other or the one by itself to one of the two next to each other or all three. Please help me in this chaos.
Thanks very much.
"With the car not running and cold, I went ahead and shorted the magnetic clutch connectors with jumper wires to the battery and was met with a sweet "CLICK!" The fan clutch held very firm as well- so I can rule out the magnetic clutch itself."
I know I sound very naive but what do you connect the wires from the battery to the fan or sensor to check the clutch like he did? I mean you have the red wire positive and the black negative coming from the battery. And then there is the sensor with three poles and two wires running into the fan. One wire with a head with two hole goes on the poles that are next to each other and one wire has one head with only one wire for the pole by itself. So if I wanted to chech the clutch like that person did which wire from the battery would I run and to which head (wire) or pole would I run that into? Also I read here in the forum a lot of people talking about hard wiring the temp sensor for the electromagnetic fan to work all the time. I still don't know how would that be done. I mean do you connect the poles to each other and wich ones. The ones next to each other or the one by itself to one of the two next to each other or all three. Please help me in this chaos.
Thanks very much.
Thread Starter
Newbie
Joined: Oct 2004
Posts: 5
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From: New York, USA
1991 190E 2.3
Hey guys,
thought I might add that it seems that all the fuses are fine. The problem is that both fans don't work. The magnetic, cooling fan, never engages at all, and the auxilary, AC fan, works for a few seconds then it's fuse, fuse number three in my car, breaks. I made sure that the fuse is of the right amp but it still happens. I am thinking it has to be something that controls them both. Like the relay for example. The other problem is that once it starts to overheat the antifreeze starts boiling and most of it come out on the floor through the little release hose right next to the resevior's cap. That of course decreases the amount of antifreeze and causes the car to continue to overheat past the red line. Currently I haven't even driven the car for over a week scared from that. The problem is I don't know what's wrong it might be the water bump or the relay or one of the sensors. And I definately don't trust my mechanic when it comes to these electrical issues. Although he's a good mechanic he has given me a couple of wrong diagnosis with electrical issues before and needless to say they were all pretty costly. So I really don't know what to do?
thought I might add that it seems that all the fuses are fine. The problem is that both fans don't work. The magnetic, cooling fan, never engages at all, and the auxilary, AC fan, works for a few seconds then it's fuse, fuse number three in my car, breaks. I made sure that the fuse is of the right amp but it still happens. I am thinking it has to be something that controls them both. Like the relay for example. The other problem is that once it starts to overheat the antifreeze starts boiling and most of it come out on the floor through the little release hose right next to the resevior's cap. That of course decreases the amount of antifreeze and causes the car to continue to overheat past the red line. Currently I haven't even driven the car for over a week scared from that. The problem is I don't know what's wrong it might be the water bump or the relay or one of the sensors. And I definately don't trust my mechanic when it comes to these electrical issues. Although he's a good mechanic he has given me a couple of wrong diagnosis with electrical issues before and needless to say they were all pretty costly. So I really don't know what to do?
Thread Starter
Newbie
Joined: Oct 2004
Posts: 5
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From: New York, USA
1991 190E 2.3
just an addition
Guys just so that the diagnosis is complete,
I wanted to add that I went downstairs now and connected the two poles next to each other, since I just found out that the one by itself is for the auxilary fan, on the temp sensor. I connected these two together and then turned the car on and, CLICK, the clutch got magnetized and the fan worked just perfect just for a minute though and then the fuse number 11 blew, and the fan stopped working. I replaced the fuse and the same thing happened again. Now the thing is that fuse, #11, does not control the fans at all, it says on the fuse box that it controls the mirrors, the tacometer, the temperture guage (the one that tells you the outside temperture on the dashboard). And sure enough all these things stopped working but my question is what does that mean? Sure enough there is a short, but where or rather how can I find out. And is it the same short that is causing the # 3 fuse (the auxilary fan fuse) to break all the time too. And if that's the case, if it's the same short, would that mean that it has to be the temperture sensor (the one with three poles on it) or the relay? or can it be anything else? And how can I find out if any of these things is bad?
I am sorry I ask too many questions, but I am just trying to be thorough. Hope anyone can help me out here.
Thanks.
I wanted to add that I went downstairs now and connected the two poles next to each other, since I just found out that the one by itself is for the auxilary fan, on the temp sensor. I connected these two together and then turned the car on and, CLICK, the clutch got magnetized and the fan worked just perfect just for a minute though and then the fuse number 11 blew, and the fan stopped working. I replaced the fuse and the same thing happened again. Now the thing is that fuse, #11, does not control the fans at all, it says on the fuse box that it controls the mirrors, the tacometer, the temperture guage (the one that tells you the outside temperture on the dashboard). And sure enough all these things stopped working but my question is what does that mean? Sure enough there is a short, but where or rather how can I find out. And is it the same short that is causing the # 3 fuse (the auxilary fan fuse) to break all the time too. And if that's the case, if it's the same short, would that mean that it has to be the temperture sensor (the one with three poles on it) or the relay? or can it be anything else? And how can I find out if any of these things is bad?
I am sorry I ask too many questions, but I am just trying to be thorough. Hope anyone can help me out here.
Thanks.
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Joined: Sep 2004
Posts: 67
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From: Edmonton, Ab, Canada
84 190E
I would check all your fuses with a meter, if yours have Alum type they can look good but in fact be rotten. The only thing that can cause fuses versus electrical motors to pop is a motor that is drawing to much (dragging). What you need to check is the Aux fan pre-resistor group and to do a draw test on the Aux fans themselves. Go to 190revolution.net and in the Maintenance Forum is a FAQ sticky that links to a online manual.
