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  #61  
Old 06-25-2018, 11:31 PM
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And they said colder thermostat wouldn't work. If you still have your old Tstat, pop it in a pot of hot water and see where it actually opens. I tried it with my old and new om603 thermostats with surprising results


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  #62  
Old 06-26-2018, 12:45 AM
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Excellent. Those are about where my temps are at with similar ambient outside temps. Now, if you really want to put the icing on the cake, wire up your aux wp to come on at 91C and to continue to run during shut off until temps are back at about 85-87C. You won't regret it. I've already posted several videos of this in action. This will keep your engine from heatsoaking and peaking at 120C during start up after driving and parking the car for a bit.
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  #63  
Old 06-26-2018, 01:03 AM
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Hate to say it, but that's what my temps look like now with ambient in the 90s. Glad it is an improvement, but I still want it running cooler. Going to have some time to ventilate one of these thermostats this weekend. Will report back.

lsmalley, I'd like to know more about wiring the fans to run cooler and run on after shut off. My Volvos had fans that ran after shutoff and I always thought it was a great idea.
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  #64  
Old 06-26-2018, 02:26 AM
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Originally Posted by lsmalley View Post
Excellent. Those are about where my temps are at with similar ambient outside temps. Now, if you really want to put the icing on the cake, wire up your aux wp to come on at 91C and to continue to run during shut off until temps are back at about 85-87C. You won't regret it. I've already posted several videos of this in action. This will keep your engine from heatsoaking and peaking at 120C during start up after driving and parking the car for a bit.
Any links on how to wire that in?
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  #65  
Old 06-26-2018, 11:15 AM
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Interesting!

I am not opposed to going back to the 79C on my end, I wonder if my fan clutch will work well with that. May try it. Worst case, it is a 10 min swap.

Do you have a PN for it? Ordering some maintenance stuff for the 560 here anyway.
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  #66  
Old 06-26-2018, 02:00 PM
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Interesting!

I am not opposed to going back to the 79C on my end, I wonder if my fan clutch will work well with that. May try it. Worst case, it is a 10 min swap.

Do you have a PN for it? Ordering some maintenance stuff for the 560 here anyway.
79C Thermostat (MB p/n 1102000615)
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  #67  
Old 06-26-2018, 03:02 PM
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Any links on how to wire that in?
Attached is a photo. It's the same as the electric fan installation (Electric fan install)
Just make sure that you wire #86 on the relay to a constant power source whether or not the key is in the ignition. This will ensure that the water pump will circulate the coolant after you shut the engine down. Once you get everything wired in, Take it out to get the temps up and then park it and shut the engine off. You should still here the water pump running. Go and put the key back in and with key on/engine off look at the temp gauge and you will be able to see the temps drop.
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M103 running warm on freeway, water pump?-water-pump.jpg  
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  #68  
Old 06-29-2018, 03:10 AM
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Here are 2 photos. One photo shows the car idling for 10 minutes with a/c on. Don't pay attention to the ambient temp at 136f, the actual temp was about 113 I believe. The heat from the asphalt and engine bay causes the ambient sensor to give a false reading after the car has sat idling for a while. The other photo shows temp at stop and go traffic with a/c on. 90C is usually where its at when I'm not stuck sitting longer than 5 mins. At highway speeds with the ac on I'm usually about 85C with ambient temp being 110 or so. With ac off at high speed it drops to about 82c or 80c. Stop and go traffic with ac off I'm about 85C and idling with ac off it takes about 20+ minutes to hit 105c for the high speed fans to kick on, but the aux water pump turns on at about 91c so that could account for the prolonging of the temp reaching 105.
Attached Thumbnails
M103 running warm on freeway, water pump?-img_20180628_165608.jpg   M103 running warm on freeway, water pump?-img_20180628_150905.jpg  
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  #69  
Old 07-07-2018, 09:36 PM
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Well, had a MAJOR issue today. Stopped at Wally World, headed home and temp started climbing, as usual. Kept climbing... kept climbing. Luckily, I had just bought two gallons of distilled water. Managed to cool it down twice and limp home. Doesn't appear to have blown the head gasket, so it could have been worse. Small hole in the lower hose right at a clamp on the water pump had drained the coolant. Had enough to cut the hose above the hole and re-clamp until I can get a new hose (probably the original 1992 hose). While I was at it, I took out the thermostat and drilled six 1/4" holes around the top ring. On the highway, never saw over 90C. Drove for about 10 mins and then stopped for about three minutes. Temp barely climbed above 100C and INSTANTLY started back down as soon as I started moving again.

Going to hit Pull A Part this week and see if I can find a big Volvo electric fan. Have already estimated that I can get it in by looking at the one on my 960. That will put an end to depending on the clutch fan at low rpms.
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  #70  
Old 07-08-2018, 12:36 AM
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Going to hit Pull A Part this week and see if I can find a big Volvo electric fan. Have already estimated that I can get it in by looking at the one on my 960. That will put an end to depending on the clutch fan at low rpms.
If you have an inline 6 Benz, the Volvo fan is not going to fit. Not enough room between the radiator and engine.
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  #71  
Old 07-08-2018, 10:10 AM
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Going to hit Pull A Part this week and see if I can find a big Volvo electric fan. Have already estimated that I can get it in by looking at the one on my 960. That will put an end to depending on the clutch fan at low rpms.
The 16" Spal fan p/n 30101516, will fit the m103 with maybe 2mm of room to spare. I had that fan on for a bit, but recently went back to the clutch fan, the stock 11 blade for the 201 since my 124 nine blade ended up breaking off into the radiator after an accident. I will admit that the viscous fan has thus far been the best. I am running the 79C thermostat and have the aux water pump circulating coolant at 91C during and after shut off. I am still attempting to fit the massive 600 watt fan from the newer MB. I have one from a W220 and I actually think I will get it to fit. Removing the aux fans and moving radiator forward about 1cm gives some clearance. I had to remove the large plastic bracket/shroud, but we'll see. I have been at it with this fan for maybe 2 years. A fan bearing bracket delete in the m103 will allow us to mount much larger fans, but my only problem is finding out how to manage the pulleys so the belt doesn't rub against itself. I mock removed the bearing bracket and the large fan went in with no issue. Unfortunately, I got too lazy to figure out a way to manage the pulley/belt set up, so I've opted to move the radiator forward. I was at it until about 3:00am, gonna head back out in the garage later today and try again.
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  #72  
Old 07-08-2018, 12:19 PM
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The first gen Prius dual puller fans bit between the om603 and radiator and I suspect other inline 6 benzes. It's more than powerful enough for the job. This was the thinnest factory fan setup I know of. I ditched the aux fan a long time ago. The more surface area you can expose to the inclonibg aur the more efficient the statement becomes.
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  #73  
Old 07-08-2018, 12:43 PM
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I think it may be good enough for any place other than socal/az desert. Out here almost every car sounds like a jet engine
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  #74  
Old 07-08-2018, 01:32 PM
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"If you have an inline 6 Benz, the Volvo fan is not going to fit. Not enough room between the radiator and engine."

I measured the fan on my 960 and it certainly appears that it will fit with the clutch fan removed. Not driving the 960 right now, so may just pull it out and see if I can fit it in the parts car, then transfer the works to the wagon.
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  #75  
Old 07-08-2018, 01:42 PM
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"If you have an inline 6 Benz, the Volvo fan is not going to fit. Not enough room between the radiator and engine."

I measured the fan on my 960 and it certainly appears that it will fit with the clutch fan removed. Not driving the 960 right now, so may just pull it out and see if I can fit it in the parts car, then transfer the works to the wagon.
Good luck. What model Benz are we talking about? I also have a 960 and installed 960 fans on a 190e 2.3, volvo 240 and BMW 318is. On my 92 190e 2.6, 87 300d and 97 e300d the space was too tight. Going from memory the Volvo 960 fan motor is over 5" deep, that's what makes it so powerful.

This one has been running on my 190e 2.3 for 9 years now.

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Last edited by tjts1; 07-08-2018 at 01:54 PM.
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