Re: [MBZ] 124 aux fan
Low speed switch is on the AC receiver/dryer, I think the ones with the long pigtail (the other is the low pressure switch). With ignition on, shorting the two wires will cause the fan to run at low speed. You can test the fan (sans relays and resistor) by connecting the two leads at the fan bracket after unplugging to a battery -- caution, small leads will get HOT, it draws some amps on high. If it runs from the battery but not the switches, the relay is bad. If the low speed doesn't work, check for a cracked resistor, it's right by the receiver/dryer. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 124 aux fan
There is also a low speed test, don't remember off the top of my head, but IIRC there is a relay in the back of the fuse box, short the appropriate pins to make the fan run on low speed. -- Max Dillon Charleston SC '87 300TD '95 E300 ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 124 aux fan
High speed test: short the two wires together in the temperature sensor mounted front top of the head. That sensor has three wires connected, a single pin connector and a two-pin connector. -- Max Dillon Charleston SC '87 300TD '95 E300 On July 20, 2015 3:58:33 PM EDT, WILTON via Mercedes wrote: >Somebody please remind me of the testing procedure for 124 aux fan. > >Wilton >___ >http://www.okiebenz.com > >To search list archives http://www.okiebenz.com/archive/ > >To Unsubscribe or change delivery options go to: >http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 124 aux fan
There is probably a fuse on the low speed relay that often blows. It's in the second half of the fuse box that you have to uncover by removing some screws. At least, this was the case in my 95 124. Jaime On Sunday, August 24, 2014, Kaleb C. Striplin via Mercedes < mercedes@okiebenz.com> wrote: > Messing with the kids 93 300D. I evacuated and recharged the AC with my > AC machine. The high side was getting way high and compressor shuts off. > Aux fans not coming on. I tried jumping the switch on the drier, they do > not come up but I can hear the relay click. if I pull the 2 pin plug that > goes to the fans and apply power from battery to 1 of the pins, the fans > run, if I apply power to the other pin, it shorts. I had thought you would > apply power to 1 pin and connect the other pin to ground. I wonder if I > got a short to ground since applying power to the 1 pin runs the fans? If I > pull the 2 pin plug off the temp sensor or whatever it is on the top of the > engine, the fans run on high. I replaced the resistor from one I had from > another car and it still did not work, but the one I pulled off the other > car seems iffy. So, I am just leaving the plug off the engine for now so > at least the fan is running. Of course it comes on as soon as the key is > turned on. > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > All posts are the result of individual contributors and as such, those > individuals are responsible for the content of the post. The list owner > has no control over the content of the messages of each contributor. > -- Jaime Kopchinski http://www.jaimekop.com/ ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 aux fan
I replaced the one on my 95 but that ended up not being the problem, so that one should be good except I cant find it! On 8/24/2014 1:57 PM, Peter Frederick wrote: The resistor (for low speed) is shot. It's by the receiver/dryer, most likely it's cracked. Common failure. Might just be broken or corroded wires, and it's possible the connection in the fuse box came apart, but not terribly likely. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
Re: [MBZ] 124 aux fan
The resistor (for low speed) is shot. It's by the receiver/dryer, most likely it's cracked. Common failure. Might just be broken or corroded wires, and it's possible the connection in the fuse box came apart, but not terribly likely. Peter ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
