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G-AMG G-Class DIY Host Date registered: May 2006 Location: South Texas Vehicle(s): '04 G55, '80 280GE, '99 S420, '98 E320, 2011 E350 | Radiator Aux Fan Help Greets, With temperatures on the rise, I have noticed the coolant temperature inching up to the 3/4 range, and sometimes getting close to the bottom of red with the A/C on. Yesterday, I got out to have a look, and low-and behold, the Aux fan was not on!! I bypassed the system, and hooked the fan up to 12V, and voila! the fan DOES work. My question is: I have scoured the wiring diagrams in the owners' manual, my EPC and the WIS and I can find zip about an AUX fan!! Is this an "extra" someone has added in the past? As I recall from some post way gone by, someone had a manual switch to turn it on/off ad librium. Is it a no-no to hook up a switch directly into a circut from the fuse area to the fan, or does there need to be a relay?? Thanx | ||
#72220 | |||
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DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | RE: Radiator Aux Fan Help G-AMG - 4/30/2007 8:57 PM Greets, With temperatures on the rise, I have noticed the coolant temperature inching up to the 3/4 range, and sometimes getting close to the bottom of red with the A/C on. Yesterday, I got out to have a look, and low-and behold, the Aux fan was not on!! I bypassed the system, and hooked the fan up to 12V, and voila! the fan DOES work. My question is: I have scoured the wiring diagrams in the owners' manual, my EPC and the WIS and I can find zip about an AUX fan!! Is this an "extra" someone has added in the past? As I recall from some post way gone by, someone had a manual switch to turn it on/off ad librium. Is it a no-no to hook up a switch directly into a circut from the fuse area to the fan, or does there need to be a relay?? Thanx Which G? The 280GE? As I remember, the aux fan works on a temp sensor and it's part of the A/C circuit. I don't remember where the sensor is located; but methinks it's in or around the radiator. | ||
#72225 - in reply to #72220 | |||
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DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | RE: Radiator Aux Fan Help I have found the fan to come on when the needle actually gets in the red....which is usually on a hot day with a/c running and you are stopped, or pulling a grade. Unfortunately, it will get in red when I stop to get a sodapop at a store and only works with ignition switch in "ON" mode. I have pondered wiring to a switch versus leaving the switch "ON" (which I dont) but from what I have read on the forums 3/4 on the needle is somewhat normal for the M110. You can test wiring to your fan by grounding out the wire that is connected to the thermo switch on the head. This is for a W460 which I am assuming is the G in question. I can verify wiring if you would like as I had same concerns last year and found all to be as it was suppose to. The switch is one of the two sensors in top right of the photo...I cant remember which one as I am at work and cant verify till later. Mike Edited by DesertStar 4/30/2007 11:24 PM (exh1 (600 x 450).jpg) Attachments ---------------- exh1 (600 x 450).jpg (69KB - 0 downloads) | ||
#72228 - in reply to #72220 | |||
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hus55 Expert Date registered: Apr 2006 Location: north cyprus,lapta. Vehicle(s): 300GDS, G300 LONG,300GDT CLK55 AMG CAB. Posts: 2230 | RE: Radiator Aux Fan Help shakir is the man for this topic.he has a brilliant set up on his m110 and will guide you in the right direction about switches and relays etc. you may want to pm him for a quick response. | ||
#72247 - in reply to #72220 | |||
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Ernest T Bass Date registered: Dec 1899 Location: Vehicle(s): | RE: Radiator Aux Fan Help On my old 300e the aux/ac fan failed a few times and it was the temp sensor in the refrigerant line near the ac compressor. In the end the solution suggestion of the Mercedes mechanic was to bypass the switch an let the fan run all the time – to change it means undoing the gas lines and re-gassing. It was no problem in Miami – had the ac on most of the time. I never had any other problems with it. But even in the Miami heat the water was not getting noticeably hotter with the aux fan off it was just the ac that would not cool down with out it. I would check out the cooling system thoroughly as that where the problem could well be. | ||
#72270 - in reply to #72220 | |||
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Mark G Date registered: Jul 2006 Location: Ft. Lauderdale, FL USA Vehicle(s): 1985 280GE LWB AT | RE: Radiator Aux Fan Help A good place to start is the fuse box (if we are talking the 460). Actually behind the fuse box. There is where the power comes from via a relay to the fan. The relay is activated via a negative ground from the thermo sensor on the engine head. The power wire to the fan can get hot. Many years ago I was trouble shooting the same problem and finally just dropped the fuse box down. There I discovered all sorts of issues. Mostly with crimped connections getting hot. It was obvious that previous owners and/or Federalizers had their hands in their so can not attribute some of the trouble I found to Mercedes workmanship. For these older G’s I do suggest a general maintenance of dropping the fuse box for an inspection. You will obviously see problem or hot spots (if any). The fixes are normally as simple is re-crimping new connectors. But do it right with good crimping and heat shrink insulators (a dab of dielectric grease also). Poor crimping leads to resistance (heat) and future trouble. By the way, for anybody with an electric aux fans not working. They can be opened up and serviced. | ||
#72283 - in reply to #72220 | |||
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G-AMG G-Class DIY Host Date registered: May 2006 Location: South Texas Vehicle(s): '04 G55, '80 280GE, '99 S420, '98 E320, 2011 E350 | RE: Radiator Aux Fan Help Thanx all for the input. After sifting through the "Pasta Primavera" of wiring mess, I was able to backtrack the wire back to the relay. In tracking down the various possible sources of fault, I will need to check out the relay. I'm sure this is a very basic question, but: HOW DOES ONE "TEST" A RELAY?? to see if it is faulty. Thanx again. It is such a treat to have a "brotherhood" of G-owners/lovers who are so willing to help one another out!! Cheers! | ||
#72419 - in reply to #72220 | |||
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G-AMG G-Class DIY Host Date registered: May 2006 Location: South Texas Vehicle(s): '04 G55, '80 280GE, '99 S420, '98 E320, 2011 E350 | Re: Radiator Aux Fan Help Mike, or anyone else, could you kindly identify- which of the two switches in the photo is the thermoswitch(s)? and by "grounding" the wire, is there only one wire, and I just ground it to the block? Also, Steve at Eurotruck was very kind and sent me the wiring diagragm, and it actually shows TWO thermal switches sending to the Aux Fan Relay. In Mike's photo, could BOTH the switches be the ones noted above? Thanx in advance! | ||
#72420 - in reply to #72220 | |||
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Phil Veteran Date registered: Jun 2006 Location: Newton, Massachusetts Vehicle(s): 1984 280GE Posts: 218 | Re: Radiator Aux Fan Help Don't know how relevant or helpful this is, but, when faced with the same problem (cure was to fix a small, under-dash leak in A/C system) I considered doing something similar: bypassing to a 12v and running a toggle switch to the dashboard. This would allow the driver the discretion as to when the aux fan kicked in. | ||
#72423 - in reply to #72420 | |||
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Ernest T Bass Date registered: Dec 1899 Location: Vehicle(s): | RE: Radiator Aux Fan Help Now I am very confused. The switch in Mikes photo looks like the thermo time switch for the cold start valve. Or is there a switch in the head to start the aux fan too? Isn’t the ac fan switch on or near the ac drier? It has two terminals 255 in the picture. The solution I used was to short out the two terminals with a flat fuse if that starts the fan then I would have thought the relay was ok and it’s the switch that’s the problem. Edited by Ernest T Bass 5/2/2007 11:53 AM (ac.jpg) Attachments ---------------- ac.jpg (29KB - 1 downloads) | ||
#72424 - in reply to #72220 | |||
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fourbyfourclub Extreme Veteran Date registered: Apr 2006 Location: New Jersey, USA Vehicle(s): 300G Posts: 302 | RE: Radiator Aux Fan Help Patrick, check your PM, regards, Vlad fourbyfourclub | ||
#72431 - in reply to #72220 | |||
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DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | RE: Radiator Aux Fan Help Sorry for the delay. In the workshop manual under M110 section page 060/10 shows the detail that I have photo below. I did not post the best photo so here is more detail ...starting left to right in the photo, Plug Coolant gauge pickup sensor Thermo time switch for cold start Plug 100 degree temp switch and intermediate piece M18 x 1.5 for auxilliary fan air conditioning system. The switch works in such a way that once temp is reached it completes the circuit. Right now I am having a senior moment and cant remember how I tested, but I do remember reading about how to in BWF I believe. Here is another schematic...rather crude but has parts listing. http://www.performanceproducts4benz.com/Drawings.aspx?bmid=148 I wish I knew how to save pages of EPC or Workshop Manual so I can share on occasion. Mike (switches (600 x 450).jpg) Attachments ---------------- switches (600 x 450).jpg (67KB - 2 downloads) | ||
#72461 - in reply to #72220 | |||
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sloughboy Regular Date registered: Jul 2006 Location: Edmonton, Alberta Canada Vehicle(s): 1989 280 ge swb; 1997 G320 lwb; lexus gx; Posts: 92 | RE: Radiator Aux Fan Help While we are on the "too hot" topic, what is the correct operating temperature for the 110 engine, and how does one check out to see what the temperature actually is? I could then verify if the temp gauge is reading correctly. | ||
#72494 - in reply to #72220 | |||
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Titus Pullo Elite Veteran Date registered: May 2007 Location: Ottawa, ON, Canada Vehicle(s): '90 Wolf 240GD, '06 G270 CDI. Posts: 1010 | Re: Radiator Aux Fan Help G-AMG - 5/2/2007 10:25 AM Symply grounding the wire must run the fan, if everithing else is OK. at least this works on the other cars, never tryed on my G. the thermostathic switch is the one with "100 C" stamped on the base. good luck. in the worst case you can run wires & toggle switch, dont forged relay Mike, or anyone else, could you kindly identify- which of the two switches in the photo is the thermoswitch(s)? and by "grounding" the wire, is there only one wire, and I just ground it to the block? Also, Steve at Eurotruck was very kind and sent me the wiring diagragm, and it actually shows TWO thermal switches sending to the Aux Fan Relay. In Mike's photo, could BOTH the switches be the ones noted above? Thanx in advance! | ||
#72498 - in reply to #72420 | |||
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G-AMG G-Class DIY Host Date registered: May 2006 Location: South Texas Vehicle(s): '04 G55, '80 280GE, '99 S420, '98 E320, 2011 E350 | RE: Radiator Aux Fan Help Mike, thanx a million for the extra pic/explanation. I will trouble shoot this weekend. To all who offered their expertise, I am indebted! Greets | ||
#72621 - in reply to #72220 | |||
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G-AMG G-Class DIY Host Date registered: May 2006 Location: South Texas Vehicle(s): '04 G55, '80 280GE, '99 S420, '98 E320, 2011 E350 | RE: Radiator Aux Fan Help FOLLOW-UP: Well, I tried grounding the coolant sensor, but no joy, it did not turn the Aux Fan on. Also, I noticed only 7,5 Volts at the sensor. Strange. To make a long story short, I ended up just bypassing the whole "automatic" sequence, and just hooked up the Aux Fan to the Foglamp Switch, so now I have 100% control of the Fan. I would assume the Fuse for the Foglamps should be sufficient to handle the Aux Fan. I really appreciate all your input and help. Cheers. | ||
#73260 - in reply to #72220 | |||
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